Zamia integrifolia is a small, resilient cycad belonging to the family Zamiaceae and the only cycad species native to the continental United States. Known commonly as coontie, Florida arrowroot, or Seminole bread, this ancient gymnosperm has survived ice ages, colonial exploitation, and urban sprawl across the Florida peninsula. The genus Zamia encompasses over 80 recognized species distributed throughout the Americas, making it the most species-rich and ecologically diverse cycad genus on Earth. Within this remarkable lineage, Zamia integrifolia occupies a unique biogeographic position at the northernmost limit of the entire order Cycadales in the New World.
The accepted name Zamia integrifolia L.f. (1789) follows the nomenclatural authority of POWO (Plants of the World Online, Royal Botanic Gardens, Kew). This species has accumulated a long trail of synonyms reflecting decades of taxonomic controversy, most notably Zamia floridana A.DC., Zamia media Jacq., Zamia silvicola Small, Zamia umbrosa Small, and the widely misapplied Zamia pumila L., which is actually a distinct Caribbean species endemic to the West Indies. The confusion between Zamia integrifolia and Zamia pumila persisted in the literature for over two decades following Eckenwalder’s overly broad 1980 circumscription and is only now being fully resolved through molecular phylogenetics.
Taxonomy, Subspecies, and Regional Forms
A Complex Nomenclatural History
The taxonomic history of Zamia integrifolia reads like a botanical detective novel. The type specimen was a cultivated plant from East Florida, described by William Aiton at the Royal Botanic Gardens, Kew, in 1789. The specimen may have originated from Andrew Turnbull’s colony at New Smyrna, sent via Alexander Garden in Charleston to Aiton in London.
Before the 1980s, botanists recognized several distinct species of Zamia in Florida, including Zamia integrifolia, Zamia floridana, Zamia silvicola, and Zamia umbrosa. In 1980, Eckenwalder drastically lumped all Floridian, Bahamian, and Caribbean populations into a single broadly defined Zamia pumila, incorporating 27 previously described species into the subspecies Zamia pumila subsp. pumila. This classification is no longer accepted. Modern molecular studies have reinstated Zamia integrifolia as one of nine species within the Zamia pumila species complex, a monophyletic group distributed across the Caribbean Basin and Florida.
Molecular phylogenetic work by Calonje et al. (2019) and Lindstrom et al. (2024) has demonstrated that Floridian Zamia integrifolia is sister to a clade comprising all Bahamian and Caribbean island zamias. Populations identified as Zamia integrifolia from the Bahamas appear more closely related to Zamia angustifolia and Zamia pygmaea than to Floridian plants, and Cuban populations show closer affinity to Zamia lucayana than to Florida material. These findings suggest that the current broad circumscription of Zamia integrifolia across its entire range may yet be revised as more genomic data accumulate.
Ward’s Five Varieties (2016)
In a landmark paper published in Phytologia, Daniel B. Ward (2016) formally described five varieties of Zamia integrifolia in Florida, based on differences in leaflet morphology, cone size, habitat, and geographic distribution. Crucially, Ward demonstrated through common-garden cultivation experiments that the morphological differences between populations are genetically determined, not merely a product of environmental plasticity. His five varieties are:
Variety integrifolia — The typical and most widespread form throughout the Florida peninsula, present on both coasts and extending south into the former stands of the Miami-Dade County rocklands. Leaflets are 8 to 14 mm wide, and female cones measure 4 to 8 cm in length. This is the variety most commonly seen in commercial landscaping and highway plantings across Florida.
Variety umbrosa (Small) D.B. Ward — Known as the East Coast coontie, broad-leaflet coontie, or Palatka giant coontie. Restricted to the upper eastern peninsula of Florida, from St. Johns County and eastern Marion County south to Brevard County, and possibly formerly present in southeastern Georgia. Leaflets are 12 to 16 mm wide, with slightly protruding vein tips forming small teeth or callous bumps near the apex. Ward considers this the variety most strongly differentiated from the typical form.
Variety broomei D.B. Ward — Named in honor of Thomas H. Broome of The Cycad Jungle nursery in Lakeland, Florida. Found in the lower Suwannee River basin across Dixie, Gilchrist, Levy, and Alachua counties in northwest peninsular Florida. Characterized by narrow leaflets only 5 to 7 mm wide and sparse, erect foliage.
Variety floridana (A.DC.) D.B. Ward — Documented from shell mounds on the Gulf Coast in Levy County, though expected further south on extant shell mounds. Distinguished by remarkably large female cones, up to 18 cm tall and 8 cm in diameter, roughly twice the size of cones produced by east-coast plants.
Variety silvicola (Small) D.B. Ward — Found near Crystal River and in the Everglades. Leaflets measure 12 to 17 cm long and 10 to 15 mm wide. The luxuriant, broad-leafleted foliage has made this form popular in horticulture, though the possibility that some cultivated specimens represent merely robust, older individuals of variety integrifolia has not been entirely excluded.
Griffith et al. (2022): A Genetic Simplification
In a significant molecular study, Griffith et al. (2022) analyzed genetic samples of Zamia integrifolia from across its known range in Florida and found support for only two genetically distinct varieties: Zamia integrifolia var. umbrosa and everything else, which should be subsumed into Zamia integrifolia var. integrifolia. The study revealed considerably less genetic variation within Floridian Zamia integrifolia than exists in other Zamia species across the Caribbean. Most local populations in Florida exhibit signatures of a recent population bottleneck, which the authors attribute to the massive exploitation of the species for starch production during the nineteenth and early twentieth centuries.
The Flora of the Southeastern United States (Weakley 2023) now follows Griffith et al.’s simplified two-variety scheme, though POWO still lists Ward’s varieties. Collectors and enthusiasts should note that morphological variation among Florida populations remains real and horticulturally significant, regardless of how many varieties are formally recognized.
Populations Beyond Florida
Zamia lucayana, formerly sometimes listed as a synonym of Zamia integrifolia, is now regarded as a valid species restricted to Long Island in the Bahamas. The Bahamian populations currently assigned to Zamia integrifolia occur on the Abaco Islands (where the species is abundant), northern Andros (common), Grand Bahama (rare), New Providence, and Eleuthera. Cuban and Cayman Islands records exist but require further investigation, and a report from south-central Puerto Rico also needs confirmation. Future molecular work may well split some of these insular populations into distinct taxa.
Natural Habitat and Distribution
Zamia integrifolia inhabits a remarkably diverse range of habitats across its distribution, united by a single critical requirement: well-drained soils. In Florida, the species grows in pine flatwoods dominated by Pinus elliottii (slash pine), xeric oak scrub, coastal hammocks, shell mounds, and the oolitic limestone rocklands of southern Miami-Dade County. Elevations range from sea level to about 30 meters.
In the continental United States, populations are presently confined to Florida. The species was reported twice from extreme southeastern Georgia, once in 1928 (a single plant of uncertain origin) and again in 1971 (a population of three plants on St. Simons Island, Glynn County), but a targeted search in 2016 failed to locate any surviving specimens. Zamia integrifolia is now presumed extinct in Georgia.
In the Bahamas, the species occurs in Bahamian pine forests and dry forests, as well as in sandy coastal scrub and coastal thickets. The Abaco Islands support the largest Bahamian populations.
The species generally prefers filtered sunlight to partial shade in natural settings, though it tolerates full sun in cultivation, particularly in more northern parts of its range where light intensity is lower. Soil types range from well-drained sands and sandy loams to limestone substrates, including elevated shell mounds along the Gulf coast.
Morphological Description
General Habit and Stem
Zamia integrifolia is a low-growing, shrub-like cycad with a stem (caudex) that typically remains subterranean or barely emergent, reaching only 3 to 25 cm above ground level. The caudex is tuberous, 3 to 10 cm in diameter in younger plants, sometimes reaching 25 cm in old specimens. Over time, the plant develops a multi-branched cluster with a large, tuberous root system that is actually an extension of the aerial stems underground. This subterranean growth habit provides excellent protection against fire and frost alike.
The exposed apex of the stem is woolly, covered with persistent scales and hairy old leaf bases that form a characteristic crown. Young plants produce a single rosette of leaves; mature specimens are typically multi-headed with several growth points.
Leaves and Leaflets
The leaves are pinnate, 20 to 100 cm long, produced in close spirals from the crown. Each plant bears 2 to 15 leaves at any given time, depending on age and growing conditions. The petioles are unarmed (lacking the spines found in some other Zamia species).
Each leaf carries 10 to 30 pairs of opposite leaflets arranged along a central rachis. The leaflets are linear to narrowly oblong, 6 to 17 cm long and 2 to 18 mm wide, very stiff, dark glossy green, and often slightly twisted along their length. Venation is subparallel and dichotomous, with 7 to 23 veins per leaflet. The margins are often revolute (rolled under) and may be entire or bear small teeth to slight denticulations near the apex.
The leaves are deciduous in response to cold stress. During freezing periods, the plant can lose its entire canopy, surviving as a dormant underground tuber. This capacity for complete foliar dormancy is the key to the species’ unusual cold hardiness among cycads.
Reproductive Structures
Zamia integrifolia is strictly dioecious: individual plants are either male or female throughout their lives.
Male plants produce 2 to 5 strobili (pollen cones) per reproductive cycle. The pollen cones are narrowly cylindric, 5 to 16 cm long, tapering slightly at the apex, and yellowish-brown to tan at maturity. They are composed of tightly packed microsporophylls that release abundant pollen.
Female plants produce a single, stout, cylindric-ellipsoid megastrobilus (seed cone) per cycle, 5 to 19 cm long, blunt at the apex. Each sporophyll bears two ovules. The mature seeds are drupelike, oblong to ovoid, somewhat angular, 1.5 to 2 cm long, enclosed in a fleshy sarcotesta that turns bright orange to red at maturity. The sarcotesta is the only part of the plant relatively free of toxic cycasin.
Pollination is entomophilous, carried out primarily by the weevil Rhopalotria slossoni and the erotylid beetle Pharaxonotha floridana. These insects use male cones as shelters and larval food sources, inadvertently transferring pollen to receptive female cones. The plant appears to regulate this mutualistic relationship through differential toxin distribution: the neurotoxin BMAA is present but sequestered within intact idioblast cells in male cones (allowing insect activity), while it is diffusely distributed throughout the tissues of female cones (discouraging herbivory on developing seeds). Receptivity and seed maturation occur primarily between December and March.
Root System
Like all cycads, Zamia integrifolia produces specialized coralloid roots in addition to normal lateral roots. These short, thick, repeatedly branched roots grow upward toward the soil surface and harbor endosymbiotic cyanobacteria of the genus Nostoc within a specialized intercellular zone between the inner and outer cortex. Despite their green coloration, the coralloid roots do not photosynthesize; the color comes from the cyanobacterial pigments. The Nostoc symbionts fix atmospheric nitrogen, providing the plant with a crucial nutrient source in the nutrient-poor sandy soils it typically inhabits.
Morphological Variation Across Populations
The following table summarizes the key morphological differences among the Florida varieties as described by Ward (2016), noting that Griffith et al. (2022) recognize only var. integrifolia and var. umbrosa as genetically distinct:
| Character | var. integrifolia | var. umbrosa | var. broomei | var. floridana | var. silvicola |
|---|---|---|---|---|---|
| Leaflet width | 8–14 mm | 12–16 mm | 5–7 mm | Variable | 10–15 mm |
| Leaflet length | 6–17 cm | 6–17 cm | Shorter | Variable | 12–17 cm |
| Leaf posture | Arching | Arching | Erect | Variable | Arching |
| Female cone length | 4–8 cm | 4–8 cm | Small | Up to 18 cm | Medium |
| Foliage density | Moderate | Dense | Sparse | Moderate | Dense, lush |
| Distribution | Widespread FL | Upper east FL | Suwannee basin | Gulf shell mounds | Crystal River, Everglades |
| Genetic status (Griffith 2022) | Merged into var. integrifolia | Distinct | Merged | Merged | Merged |
Zamia integrifolia vs. Zamia furfuracea: A Comparative Guide
Among the roughly 80 species of Zamia, only two are widely available in the horticultural trade and familiar to most gardeners: Zamia integrifolia (coontie) and Zamia furfuracea (cardboard palm or cardboard cycad). Both are low-growing, ornamental cycads of the family Zamiaceae, but they differ significantly in origin, morphology, hardiness, and landscape use. This comparison helps growers and collectors choose between them and avoid frequent misidentifications.
Geographic Origin
Zamia integrifolia is native to the southeastern United States (Florida, formerly Georgia), the Bahamas, Cuba, and the Cayman Islands. It grows in a subtropical to warm-temperate climate zone, experiencing occasional frost and even brief freezes across the northern part of its range.
Zamia furfuracea is endemic to a small area in the coastal mountains and sandy limestone sea cliffs of southeastern Veracruz state in eastern Mexico. Its natural habitat is more uniformly tropical, ranging from arid thorn scrub to sandy coastal environments.
Habit and Stem
Zamia integrifolia develops a predominantly subterranean caudex, rarely exceeding 25 cm above soil level. The overall silhouette is graceful and open, resembling a low fern or small palm emerging from the ground. Mature plants form multi-headed clusters through underground branching.
Zamia furfuracea produces a short but visible above-ground trunk, up to 20 cm broad and high, often marked with prominent leaf-base scars. The growth habit is more compact and stocky, forming a dense, rounded rosette. Including the leaves, the plant typically reaches 1.3 m tall with a spread of about 2 m at maturity.
Foliage
This is the most immediately recognizable difference between the two species. Zamia integrifolia has narrow, linear leaflets (2 to 18 mm wide) that are smooth, glossy dark green, stiff, and often slightly twisted. The overall impression is of fine, feathery, fern-like foliage.
Zamia furfuracea has broad, oval to oblong leaflets (up to 3 cm wide) that are thick, leathery, and covered in a characteristic scurfy, fuzzy pubescence giving them a dry, cardboard-like texture — hence the common name. The leaflets are arranged in up to 13 opposite pairs per frond. The foliage feels coarse and papery to the touch, entirely unlike the smooth leaves of Zamia integrifolia.
Cold Hardiness
This is a critical practical difference for growers. Zamia integrifolia is remarkably cold-hardy for a cycad, tolerating temperatures down to approximately −12 °C (10 °F), corresponding to USDA zone 8b. Its ability to lose all its foliage and survive as a dormant underground tuber through winter freezes is the key to this hardiness. However, juvenile plants and recently transplanted specimens are significantly more vulnerable to cold damage than established adults with well-developed subterranean caudices. Growers in marginal zones (USDA 8b to 9a) should protect young plants for the first two to three winters.
Zamia furfuracea is considerably less cold-tolerant, rated for USDA zones 9b to 11, with a minimum survival temperature of approximately −3 °C (25 °F) for established plants. It lacks the deep subterranean caudex that gives Zamia integrifolia its frost escape strategy.
Reproductive Structures
Both species are dioecious, producing separate male and female cones. Male cones of Zamia integrifolia are narrow and cylindric, while those of Zamia furfuracea tend to be more compact. Female cones in both species produce bright orange to red seeds with a fleshy sarcotesta. Zamia furfuracea is notoriously difficult to propagate from seed in cultivation because seeds require cross-pollination and have very low germination rates, which has contributed to the illegal collection of wild plants and the species’ IUCN Endangered status.
Conservation Status
Zamia integrifolia is classified as Near Threatened by the IUCN (assessed 2011), having declined by an estimated 20% across parts of Florida over the past 90 years, primarily due to habitat destruction. However, it remains abundant across much of its range and is widely propagated in nurseries.
Zamia furfuracea is classified as Endangered by the IUCN, owing to its extremely restricted natural range in Veracruz and the ongoing pressure from illegal wild collection for the horticultural trade.
Summary Comparison Table
| Feature | Zamia integrifolia | Zamia furfuracea |
|---|---|---|
| Common name | Coontie, Florida arrowroot | Cardboard palm, cardboard cycad |
| Origin | SE United States, Bahamas, Cuba | Veracruz, Mexico |
| Stem | Mostly subterranean, gracile | Short, visible, stocky |
| Leaflet shape | Linear, narrow (2–18 mm) | Oval, broad (up to 30 mm) |
| Leaflet texture | Smooth, glossy | Thick, fuzzy, cardboard-like |
| Plant height | 20–100 cm (leaves included) | Up to 130 cm |
| Cold hardiness | USDA 8b–11 (−12 °C) | USDA 9b–11 (−3 °C) |
| Dormancy strategy | Deciduous under frost | Semi-evergreen |
| IUCN status | Near Threatened (NT) | Endangered (EN) |
| Availability | Very widely cultivated | Widely cultivated |
Historical and Cultural Significance
The cultural history of Zamia integrifolia is inseparable from the history of Florida itself. The common name coontie (also spelled koonti) derives from the Seminole Mvskoke word conti hateka. For centuries before European contact, Indigenous peoples of Florida, including the Calusa, Tequesta, and Seminole, processed the starchy subterranean stems of the plant into a flour used for bread and porridge.
The preparation of coontie starch was a laborious and essential process. The entire plant is highly toxic due to the presence of cycasin, a potent carcinogenic and neurotoxic azoxyglycosid. To render the starch edible, the tubers had to be grated, soaked repeatedly in water, and fermented to break down and wash away the toxins. This technology was sophisticated and widespread, and coontie starch was a dietary staple for many Florida Native American communities.
European settlers quickly adopted the practice. George J. F. Clarke, surveyor general of East Florida during the Second Spanish Period, wrote an article in 1823 for the East Florida Herald describing how the bulbous roots of “comtee” could be processed into flour. By the mid-nineteenth century, commercial coontie starch mills had sprung up across south Florida, producing “Florida arrowroot” for both domestic use and export. At its peak in the late 1800s, the industry was devastating wild populations. Entire landscapes of coontie were stripped to feed the starch mills, and by the early twentieth century, the species had been driven to near-extinction across much of its former range in southern Florida. The population bottleneck detected by Griffith et al. (2022) in the genetic data is the molecular signature of this industrial overexploitation.
The decline of Zamia integrifolia had a dramatic cascading effect on associated wildlife, most notably the Atala butterfly (Eumaeus atala), whose larvae feed exclusively on Zamia leaves. The near-destruction of coontie populations nearly caused the extinction of the Atala, a story explored in detail below.
Growing Zamia integrifolia: Complete Care Guide
Light and Exposure
In its natural habitat, Zamia integrifolia grows in filtered sunlight to partial shade beneath pine canopies and in hammock understories. In cultivation, the species is remarkably adaptable: it thrives in full sun, partial shade, or even fairly deep shade. Plants grown in full sun tend to develop shorter, more compact leaves with a deeper green color, while shade-grown specimens produce longer, more arching fronds.
In regions with intense summer heat (such as USDA zones 9b to 11), partial afternoon shade is beneficial. In cooler zones (8b to 9a), full sun exposure helps maximize heat accumulation and promotes hardier growth.
Soil and Drainage
Excellent drainage is the single most critical soil requirement. Zamia integrifolia naturally grows in deep sands, sandy loams, and porous limestone substrates. In cultivation, a mix of coarse sand, perlite, and well-drained potting soil works well. For in-ground planting, amend heavy clay soils heavily with sand and organic matter, or plant on raised beds or berms. A slightly acidic to neutral pH (5.5 to 7.0) is ideal, though the species tolerates mildly alkaline limestone soils.
The subterranean caudex is highly susceptible to rot in waterlogged conditions. Crown rot caused by fungal pathogens is nearly impossible to reverse once established.
Watering
Zamia integrifolia is genuinely drought-tolerant once established, storing water reserves in its tuberous underground stem. During the active growing season (spring through fall), water deeply but allow the soil to dry substantially between irrigations. In winter, reduce watering significantly, especially in cool climates where the plant may be dormant or semi-dormant.
Avoid overhead irrigation that saturates the crown, particularly during cool weather. Direct water at the soil surface around the base of the plant.
Fertilization
A light feeding schedule suits this slow-growing cycad well. Apply a balanced, slow-release palm or cycad fertilizer once or twice per year, in early spring and midsummer. Alternatively, monthly applications of a diluted liquid fertilizer during the growing season work well for container-grown plants.
Avoid high-nitrogen fertilizers, which can promote soft, leggy growth susceptible to cold damage and pest attack. Micronutrient deficiencies (particularly manganese and magnesium) occasionally appear in alkaline soils and can be corrected with foliar sprays or soil amendments.
Cold Hardiness
Zamia integrifolia is the most cold-hardy Zamia species, tolerating temperatures down to approximately −12 °C (10 °F) once well established, corresponding to USDA hardiness zone 8b. This remarkable tolerance derives from the plant’s ability to shed all its leaves and enter full dormancy in its subterranean caudex during freezing conditions. New leaves regenerate from the protected underground growing point once temperatures rise in spring.
Important caveat: Cold hardiness is strongly dependent on plant age and establishment. Juvenile plants, seedlings, and recently transplanted specimens have smaller, less deeply buried caudices and are significantly more vulnerable to frost than mature, long-established adults. In USDA zones 8b to 9a, protect young plants with thick mulch and frost cloth for the first two to three winters after planting. Ensure the caudex is planted slightly below ground level so the growing point is insulated by the surrounding soil.
In Mediterranean climates such as the French Riviera (USDA 9b), Zamia integrifolia can be cultivated outdoors year-round in well-drained soil with winter protection during the occasional exceptional frost event. At the Jardin Zoologique Tropical de La Londe-les-Maures (Var, France, USDA 9b), the species performs well in the open ground, though protection is advisable during unusually cold episodes.
Container Culture
Zamia integrifolia is an excellent container plant, well-suited to patios, decks, and indoor bright-light positions. Use a freely draining potting mix (equal parts potting soil, coarse sand or perlite, and pine bark). Terracotta or unglazed pots are preferable to plastic, as they allow better air circulation around the roots and reduce the risk of rot.
Repot every two to three years as the plant fills its container, moving up one pot size each time. Water more carefully in containers than in the ground, as overwatering is the primary cause of failure in potted cycads. Bring container plants indoors or into a cool greenhouse before the first frost in zones cooler than 9a.
Propagation
From Seed
Seed propagation is the primary means of multiplying Zamia integrifolia. Harvest the bright orange seeds when the female cone begins to disintegrate, and remove the fleshy sarcotesta by soaking in water for 24 to 48 hours, then rubbing clean. (Wear gloves: the sarcotesta contains irritant compounds.)
Sow seeds shallowly in a warm, moist medium of coarse perlite and peat or coir, maintaining a temperature of 25 to 30 °C. Germination is slow and erratic, typically taking 1 to 3 months, though some seeds may require up to 6 months. Light scarification of the hard seed coat can improve germination rates. Seed viability declines rapidly after harvest; sow as fresh as possible.
Seedling growth is very slow during the first year as the young plant invests energy in developing its underground caudex. Patience is essential.
Division of Offsets
Mature, multi-headed plants occasionally produce offsets (pups) that can be carefully separated from the parent during the growing season. Use a clean, sharp knife to sever the offset, ensuring it retains some roots. Allow the cut surface to dry for 24 to 48 hours before potting in a well-drained medium. Keep warm and lightly moist until new root growth is established.
Pests and Diseases
Cycad Aulacaspis Scale (Aulacaspis yasumatsui)
The Asian cycad scale is the most serious pest threat to Zamia integrifolia and all other cultivated cycads in Florida and tropical regions worldwide. Originally from Southeast Asia, this armored scale insect was first detected in Florida in 1996 and has since spread to devastating effect. Heavy infestations appear as a white, crusty coating on the undersides of leaflets and can kill plants if left untreated.
Management includes horticultural oil sprays, systemic insecticides (imidacloprid applied as a soil drench), and biological control using the parasitoid wasp Coccobius fulvus and the predatory beetle Cybocephalus nipponicus, both introduced into Florida for this purpose.
Other Pests
Mealybugs occasionally infest the crown and leaf bases. Spider mites can appear under dry, stressed conditions. The larvae of the Atala butterfly (Eumaeus atala) feed on the leaves but rarely cause significant damage to healthy, mature plants.
Diseases
Crown rot and root rot caused by Phytophthora and other soilborne fungi are the most common diseases, almost always associated with poor drainage or overwatering. Prevention through proper soil preparation and watering practices is far more effective than treatment. Infected plants rarely recover once the crown is affected.
Leaf spot diseases (various fungal pathogens) may appear in humid conditions but are generally cosmetic rather than life-threatening.
Toxicity
All parts of Zamia integrifolia are toxic to humans and animals. The primary toxin is cycasin, an azoxyglycosid that is both carcinogenic and neurotoxic. Additional toxic compounds include macrozamin, several neocycasins, and BMAA (beta-N-methylamino-L-alanine), a neurotoxin produced by the symbiotic Nostoc cyanobacteria inhabiting the coralloid roots.
Ingestion of any part of the plant (especially the seeds and underground stem) can cause severe vomiting, diarrhea, headache, abdominal pain, liver failure, and, in extreme cases, death. There is no specific antidote.
Dogs are particularly at risk, as they may chew on fallen cones or dig up and gnaw on the tuberous roots. Cat and horse poisoning cases have also been documented. Keep all Zamia species out of reach of pets and young children.
Despite the toxicity of the raw plant, the starch extracted from the caudex was historically rendered safe for human consumption through a laborious process of repeated grating, soaking, and fermentation that removed the water-soluble cycasin. This should never be attempted at home.
Conservation Status
Zamia integrifolia is classified as Near Threatened (NT) on the IUCN Red List of Threatened Species (assessed 2010). Although the species remains abundant across much of its range, it has experienced a substantial decline estimated at around 20% in parts of Florida over the past century.
Threats
The principal threats to wild populations are habitat destruction driven by urbanization, residential development, and agricultural conversion across the Florida peninsula. The explosive growth of cities like Miami, Fort Lauderdale, Orlando, and Tampa has eliminated vast tracts of coontie habitat, particularly on the oolitic limestone rocklands of southeastern Florida.
The cycad aulacaspis scale (Aulacaspis yasumatsui) represents a severe ongoing biological threat, capable of killing entire colonies of wild plants. Climate change may alter fire regimes in pine flatwoods habitats, potentially favoring hardwood encroachment that shades out the light-loving cycad.
Legal Protections
In Florida, Zamia integrifolia is listed as a commercially exploited species under state law, meaning that collection from the wild without a permit is illegal. The species is also listed under CITES Appendix II, which regulates international trade in all cycad species.
Restoration and Propagation Programs
Nursery propagation of Zamia integrifolia is well established and large-scale, supplying the landscaping industry across the southeastern United States. The widespread use of coontie in highway medians, parking lot landscaping, and residential gardens has created a massive ex situ population that, paradoxically, now far exceeds the number of plants in the wild. This extensive horticultural presence provides a substantial buffer against extinction, though it does not replace the conservation of genetically diverse wild populations and their associated ecological communities.
Zamia integrifolia and the Atala Butterfly
The story of Zamia integrifolia and the Atala butterfly (Eumaeus atala) is one of the most compelling co-extinction and co-recovery narratives in North American natural history.
The Atala is a strikingly beautiful lycaenid butterfly with iridescent blue-green wings and a bright orange abdomen. Its larvae are obligate feeders on Zamia leaves, sequestering cycasin from the plant tissues to render themselves and the adult butterflies toxic to predators. All life stages of the Atala display aposematic (warning) coloration: the bright red-orange larvae are gregarious and conspicuous, advertising their toxicity.
When the coontie starch industry devastated Zamia integrifolia populations across south Florida in the late nineteenth and early twentieth centuries, the Atala butterfly lost its sole larval food plant over vast areas. By the 1960s, the Atala was believed to be extinct in the United States. The butterfly was gone from collections, absent from surveys, and mourned in entomological literature.
Then, in 1979, a small colony of Atalas was rediscovered in Miami-Dade County on a remnant patch of wild coontie. This remnant population became the nucleus of one of Florida’s most remarkable conservation success stories. As native plant enthusiasts and the landscaping industry began planting Zamia integrifolia widely across south Florida in the 1980s and 1990s, the Atala butterfly expanded its range accordingly. Today, the species is locally common throughout much of its former range in southeastern Florida, thriving on both wild coontie and the millions of nursery-propagated plants installed in gardens, parks, and roadsides.
The Atala’s recovery illustrates a powerful principle in conservation biology: restoring a host plant at landscape scale can bring back its dependent fauna, even from the brink of extinction. Every Zamia integrifolia planted in a Florida garden is a potential breeding site for this extraordinary butterfly.
Frequently Asked Questions
Is Zamia integrifolia a palm or a fern? Neither. Zamia integrifolia is a cycad, an ancient group of gymnosperms (seed plants) that predates both flowering plants and true ferns in evolutionary terms. Cycads are more closely related to conifers and Ginkgo biloba than to palms or ferns, despite their superficially palm-like or fern-like appearance.
Can I grow coontie outdoors in USDA zone 8b? Yes, established adult plants of Zamia integrifolia can survive in USDA zone 8b, where minimum winter temperatures reach approximately −12 °C (10 °F). However, juvenile plants and newly transplanted specimens are much more sensitive and should be protected with heavy mulch and frost cloth for the first two to three winters. Plant the caudex slightly below soil level to insulate the growing point.
Is Zamia integrifolia the same as Zamia pumila? No. Although Zamia integrifolia was long misidentified as Zamia pumila in many references, modern taxonomy recognizes them as distinct species. Zamia pumila L. is a Caribbean species, while Zamia integrifolia L.f. is the Floridian and Bahamian species. The confusion originated from Eckenwalder’s 1980 classification, which lumped all Caribbean and Floridian populations into a broadly defined Zamia pumila.
Are coontie plants toxic to dogs? Yes, all parts of Zamia integrifolia are toxic to dogs, cats, horses, and humans. The primary toxin, cycasin, causes severe gastrointestinal distress, liver failure, and potentially death. Seeds and the underground stem are the most dangerous parts. Keep pets away from all Zamia species.
How fast does Zamia integrifolia grow? Zamia integrifolia is a slow-growing plant. Seedlings may take two to three years to produce their first set of true pinnate leaves and five or more years to reach reproductive maturity. Mature plants are long-lived, potentially surviving for decades or even centuries given the geological time scale over which cycads have evolved.
Sources and Further Reading
IUCN Red List of Threatened Species. Zamia integrifolia. https://www.iucnredlist.org/
Calonje, M., Meerow, A.W., Griffith, M.P., Salas-Leiva, D., Vovides, A.P., Coiro, M. & Francisco-Ortega, J. (2019). A Time-Calibrated Species Tree Phylogeny of the New World Cycad Genus Zamia L. (Zamiaceae, Cycadales). International Journal of Plant Sciences, 180(4): 286–314.
Griffith, M.P. et al. (2022). Genetic analysis of Zamia integrifolia populations in Florida. [Details per published reference.]
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Lindstrom, A. et al. (2024). Transcriptome sequencing data provide a solid base to understand phylogenetic relationships, biogeography and reticulated evolution of the genus Zamia L. Annals of Botany, XX: 10.
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