Zamia pumila

Zamia pumila is a small, resilient cycad of the family Zamiaceae, native to the Greater Antilles in the Caribbean. Known as guáyiga in the Dominican Republic and marunguey in Puerto Rico, this ancient gymnosperm holds a singular distinction in cycad taxonomy: it was the first species ever described in the genus Zamia, making it the type species for the genus, for the Zamia pumila species complex, and for the entire family Zamiaceae. The genus Zamia is the most species-rich cycad genus on Earth, comprising over 80 recognized species distributed across the Americas.

The accepted name Zamia pumila L. (1763) follows the nomenclatural authority of POWO (Plants of the World Online, Royal Botanic Gardens, Kew). Its native range is restricted to the Greater Antilles: Cuba (central regions), Hispaniola (Dominican Republic, and formerly Haiti), Puerto Rico, and Jamaica. The species has accumulated a substantial synonymy, including Zamia debilis L.f., Zamia humilis Salisb., Zamia laeta Salisb., Zamia latifoliolata Prenlel., and Zamia allison-armourii Millsp. Crucially, Zamia pumila does not occur in Florida or the Bahamas — those populations belong to Zamia integrifolia L.f., a distinct species that was erroneously placed under Zamia pumila for over two decades following Eckenwalder’s controversial 1980 reclassification.

Taxonomy and the Zamia pumila Species Complex

Linnaeus’s First Zamia

Carl Linnaeus described Zamia pumila in 1763 from material collected in the Dominican Republic, Puerto Rico, and Cuba, establishing both the species and the genus Zamia simultaneously. As the type species, Zamia pumila anchors the nomenclature of the entire group. The specific epithet pumila (Latin for “dwarf”) refers to the plant’s low-growing habit.

The Eckenwalder Controversy

In 1980, James Eckenwalder published a radical revision that collapsed virtually all Caribbean and Floridian Zamia populations into a single, broadly defined Zamia pumila, incorporating 27 previously described species into the subspecies Zamia pumila subsp. pumila, and five Cuban species into Zamia pumila subsp. pygmaea. Under this scheme, the Florida coontie (Zamia integrifolia), the Bahamian zamias, and all Greater Antillean populations were treated as a single variable species.

Eckenwalder’s classification dominated the literature for nearly two decades and is responsible for the persistent confusion that still affects many horticultural and botanical references today. Countless nursery labels, field guides, and even scientific papers erroneously apply the name Zamia pumila to Floridian plants that are actually Zamia integrifolia.

Modern Resolution: Nine Species in the Complex

Eckenwalder’s lumping is no longer accepted. Molecular phylogenetic analyses, notably by Calonje et al. (2019) and Lindstrom et al. (2024), have demonstrated that the Caribbean and Floridian zamias form a monophyletic species complex of nine recognized species, each occupying a distinct geographic range. These include Zamia pumila (Greater Antilles), Zamia integrifolia (Florida, Bahamas), Zamia angustifolia (Bahamas, Cuba), Zamia lucayana (Long Island, Bahamas), Zamia erosa (Puerto Rico, Jamaica, Cuba), Zamia portoricensis (southwestern Puerto Rico), Zamia pygmaea (Cuba), and others.

Within this complex, Zamia pumila occupies a central phylogenetic position. Studies of Puerto Rican populations have shown that all three species present on the island — Zamia erosa in the north, Zamia portoricensis in the southwest, and Zamia pumila in the south-central region — are genetically distinct, with Zamia pumila and Zamia portoricensis possibly derived from a common ancestor on the island, while Zamia erosa appears to represent an independent colonization event.

A 2009 study provided additional support for the species complex through the discovery of the same four discrete clusters of DNA repeats shared among Zamia integrifolia, Zamia portoricensis, and Zamia pumila, confirming their close but distinct evolutionary relationships.

Ongoing Taxonomic Questions

Populations currently assigned to Zamia pumila occur on multiple islands across the Greater Antilles. Whether plants from Cuba, Hispaniola, and Puerto Rico all truly represent a single species, or whether some insular populations have diverged sufficiently to warrant recognition as separate taxa, remains an open question. Additional molecular analyses of inter-island populations are needed to resolve the boundaries of Zamia pumila in its strict sense.

The possibility that humans — particularly the Taíno — may have transported Zamia between Caribbean islands for food use adds an intriguing layer of complexity to the biogeographic picture. If some populations were anthropogenically introduced, their apparent genetic affinity might reflect human dispersal rather than natural range expansion.

Natural Habitat and Distribution

Zamia pumila inhabits subtropical dry forests across the Greater Antilles, growing in both open and understory situations. The species occurs from sea level to approximately 460 meters elevation.

Cuba — Populations are found in central Cuba. The extent of remaining habitat is poorly documented compared to Puerto Rican and Hispaniolan populations.

Hispaniola — In the Dominican Republic, Zamia pumila (known locally as guáyiga) is found primarily in the eastern and south-central regions, including the provinces of La Altagracia, La Romana, San Pedro de Macorís, and areas inland from the southern coast. The species is still actively harvested from the wild in the Dominican Republic for food use. In Haiti, populations have possibly become extirpated due to intensive land use, charcoal production, and deforestation, though the remote interior of the country has not been thoroughly surveyed.

Puerto Rico — Zamia pumila occurs in south-central Puerto Rico, where it was long believed to be restricted to limestone substrates. Recent research using toponymic data — tracing localities named “marunguey” or “marungueyes” on historical and modern maps — has revealed previously unknown populations growing on volcanic substrates in the piedmont region, substantially expanding the accepted range of the species on the island. Despite these discoveries, Puerto Rican populations have declined due to clearing for cattle ranching and urban development.

Jamaica — Some populations in Jamaica have been referred to Zamia pumila, though others on the island are now classified as Zamia erosa. The delimitation of Jamaican zamias requires further investigation.

Across its range, Zamia pumila grows on well-drained soils, typically clay over limestone, but occasionally on pure sand in coastal beach areas. The climate is tropical, with annual temperatures ranging from highs around 35 °C to lows around 10 °C and mean annual rainfall of approximately 1,500 mm, distributed relatively evenly throughout the year.

Morphological Description

General Habit and Stem

Zamia pumila is a low-growing, shrub-like cycad with a subterranean, tuberous stem approximately 25 to 30 cm long and 8 to 10 cm in diameter. The stem is topped by a crown of erect leaves and may remain completely underground or expose only its apex at the soil surface. Young plants produce a single crown; older specimens typically divide at the apex and form multiple crowns, creating a multi-headed cluster over time.

The growth habit is similar to that of Zamia integrifolia, but Zamia pumila tends to produce somewhat larger, more robust stems and longer leaves in favorable growing conditions, particularly in the humid Caribbean lowlands where rainfall is more abundant and consistent than in the seasonally dry habitats of Florida.

Leaves and Leaflets

The leaves are pinnate, 60 to 120 cm long (occasionally reaching 150 cm in vigorous specimens), with 5 to 30 pairs of leaflets. Each leaflet is linear to lanceolate or oblong-obovate, 8 to 25 cm long and 0.5 to 2 cm broad. The leaflet margins are often revolute (rolled under), and — critically for identification — bear distinct teeth at the tip. This apical toothing is the most reliable morphological character separating Zamia pumila from Zamia integrifolia, which has leaflets that are entire or only very faintly denticulate near the apex.

The petioles are prickly in Zamia pumila, bearing small spines or prickles along their length, unlike the unarmed petioles of Zamia integrifolia.

The foliage is evergreen under favorable conditions but may become semi-deciduous during prolonged drought or cold stress. The leaves are coriaceous (leathery), glossy, and dark green, with a waxy surface that reduces water loss.

Reproductive Structures

Zamia pumila is strictly dioecious. Male plants produce narrowly cylindric pollen cones that are smaller and more slender than the seed cones. Female plants produce a single seed cone (megastrobilus) per reproductive cycle. The female cones are distinctive, with a reddish coloration and a characteristic acuminate (pointed) tip that distinguishes them from the blunter cones of Zamia integrifolia.

Each sporophyll bears two ovules. The mature seeds are oblong to ovoid, enclosed in a fleshy sarcotesta that turns bright red to orange-red at maturity. The seeds are rich in starch but extremely toxic when unprocessed.

Pollination is carried out by beetles, following the same entomophilous mutualism found throughout the genus Zamia. In Puerto Rico, the beetle Pharaxonotha portophylla is known to pollinate Zamia species, living and breeding in male cones while consuming pollen and cone tissues and inadvertently transferring pollen to female cones.

Root System

Like all cycads, Zamia pumila produces coralloid roots that harbor nitrogen-fixing cyanobacteria of the genus Nostoc. These specialized roots grow near the soil surface and provide the plant with a biological nitrogen source, enabling survival in the nutrient-poor limestone and sandy soils that characterize much of its habitat.

Zamia pumila vs. Zamia integrifolia: Resolving the Confusion

The decades-long conflation of Zamia pumila and Zamia integrifolia under Eckenwalder’s broad species concept has left a legacy of confusion in the horticultural trade, botanical literature, and conservation databases. The following comparison highlights the key differences between these two closely related but distinct species.

Geographic Separation

The most fundamental distinction is geographic. Zamia pumila is a Caribbean species restricted to the Greater Antilles (Cuba, Hispaniola, Puerto Rico, Jamaica). Zamia integrifolia is a continental and Bahamian species found in Florida (formerly Georgia) and the Bahamas. Their natural ranges do not overlap.

Leaflet Morphology

Zamia pumila has leaflets with distinct teeth at the tip, giving the apex a visibly serrate or erose margin. Zamia integrifolia has leaflets that are entire or with only very faint, indistinct denticulations near the apex. This single character remains the most practical field identification tool.

Petiole Armature

Zamia pumila has prickly petioles bearing small spines. Zamia integrifolia has unarmed (smooth) petioles.

Cone Morphology

The female cones of Zamia pumila are reddish with a distinctly acuminate (pointed) tip. Those of Zamia integrifolia are typically more cylindric-ellipsoid and blunter at the apex.

Leaf Size

Zamia pumila tends to produce longer leaves (60 to 150 cm) than Zamia integrifolia (20 to 100 cm), though there is overlap in intermediate-sized specimens.

Cold Hardiness

Zamia integrifolia is considerably more cold-hardy (USDA 8b to 11, tolerating −12 °C) owing to its deep subterranean caudex and capacity for complete foliar dormancy. Zamia pumila, adapted to the frost-free or near-frost-free Caribbean, is less tolerant of prolonged cold, performing best in USDA zones 10 to 12, with marginal survival in zone 9b if well protected. Juvenile plants are significantly more sensitive than established adults.

Summary Comparison Table

Feature	Zamia pumila	Zamia integrifolia
Common name	Guáyiga, marunguey	Coontie, Florida arrowroot
Native range	Greater Antilles (Caribbean)	Florida, Bahamas
Leaflet apex	Distinctly toothed	Entire or faintly denticulate
Petiole	Prickly	Unarmed (smooth)
Leaf length	60–150 cm	20–100 cm
Female cone tip	Acuminate (pointed), reddish	Blunt, brownish
Cold hardiness	USDA 10–12 (marginal 9b)	USDA 8b–11
Dormancy capacity	Limited	Full foliar dormancy
IUCN status	Near Threatened (NT)	Near Threatened (NT)

Historical and Cultural Significance: The Guáyiga and the Taíno

The cultural importance of Zamia pumila in the Caribbean predates European contact by millennia. Archaeological evidence from Cueva de Berna, near Boca de Yuma in the Dominican Republic, indicates that Zamia roots were being processed and consumed as long as 3,800 years ago, well before the emergence of the Taíno civilization.

The Taíno people — the sophisticated pre-Columbian society that inhabited Hispaniola, Puerto Rico, Cuba, and Jamaica at the time of European contact — made extensive use of guáyiga as a dietary staple. The starchy underground stems were grated, repeatedly washed in water to leach out the toxic cycasin, and then dried to produce a flour. This flour was used to make a flatbread called chola or cholla, prepared in a manner similar to the Taíno’s iconic kasabe (cassava bread). Traditional knowledge held that the bread should be left exposed outdoors until insects began to land on it, a signal that residual toxins had been sufficiently dissipated.

The guáyiga flour tradition has survived in the Dominican Republic into the twenty-first century, particularly in the eastern provinces. The Slow Food Foundation has recognized harina de guáyiga as a heritage food in its Ark of Taste program, acknowledging both its cultural significance and its endangered status. In rural communities around La Altagracia and La Romana, the dried starch is still used to prepare traditional foods including chollas (bread rolls), arepas (biscuits), majablanco (sweet rolls), and chichueca (pork meatballs bound with guáyiga starch).

In Puerto Rico, the Taíno name marunguey persists as a toponymic marker across the island, with multiple localities named after the plant. Research by Pagán-Jiménez and Lazcano-Lara (2013) used these place names to locate previously unknown wild populations of Zamia pumila on volcanic substrates in the south-central piedmont, demonstrating how cultural memory can guide botanical discovery.

In Cuba, the plant is known as yuquilla de ratón or yuquilla de paredón, reflecting its resemblance to small yucca and its habit of growing on walls and cliff faces.

Growing Zamia pumila: Complete Care Guide

Light and Exposure

In its natural habitat, Zamia pumila grows in both open, sun-exposed sites and in the filtered light of dry forest understories. In cultivation, the species performs well in full sun to partial shade. Plants grown in full sun develop more compact rosettes with shorter, stiffer leaves, while shade-grown specimens produce longer, more arching fronds.

In Mediterranean and warm-temperate climates (such as the French Riviera, USDA 9b), Zamia pumila requires a warm, sheltered position with maximum sun exposure to compensate for the lower temperatures and light intensity compared to its Caribbean homeland.

Soil and Drainage

Excellent drainage is essential. In the wild, Zamia pumila grows predominantly on clay over limestone, but also thrives in pure sand and volcanic substrates. In cultivation, a freely draining mix of coarse sand, perlite, and quality potting soil works well. For in-ground planting, amend heavy soils with generous additions of gravel and sand. A slightly alkaline to neutral pH (6.5 to 7.5) mimics the limestone-derived soils of its native habitat, though the species tolerates a range of pH values.

Crown rot is the principal cultural disease and is almost always caused by waterlogged conditions. Ensure the base of the stem is never sitting in standing water.

Watering

Zamia pumila is adapted to a tropical climate with approximately 1,500 mm of annual rainfall distributed throughout the year, making it somewhat less drought-adapted than Zamia integrifolia. In cultivation, water regularly during the growing season, allowing the top few centimeters of soil to dry between irrigations. Reduce watering in winter, particularly in cool climates where the plant’s metabolism slows significantly.

Avoid overhead watering that wets the crown for extended periods, especially during cool weather.

Fertilization

Apply a balanced, slow-release palm or cycad fertilizer once or twice per year during the growing season (spring and midsummer). In containers, a monthly application of diluted liquid fertilizer produces good results. Micronutrient supplements (manganese, magnesium, iron) may be beneficial in alkaline soils where these elements become less available.

Cold Hardiness

Zamia pumila is a tropical species with limited cold tolerance compared to its Floridian relative. It performs best in USDA zones 10 to 12, where minimum temperatures remain above 0 °C. Established plants can survive brief dips to approximately −3 °C (25 °F) if the soil is dry and drainage is excellent, but prolonged exposure to temperatures below 5 °C causes leaf damage and can be fatal to the caudex.

Important caveat: As with all cycads, juvenile plants and newly transplanted specimens are considerably more vulnerable to cold than established adults with well-developed subterranean stems. In marginal climates (USDA 9b to 10a), winter protection with mulch, frost cloth, and overhead shelter is advisable. Container culture with winter relocation to a frost-free greenhouse or conservatory is the safest approach in Mediterranean climates.

At the Jardin Zoologique Tropical de La Londe-les-Maures (Var, France, USDA 9b), Zamia pumila requires more protection than Zamia integrifolia, which benefits from its superior foliar dormancy mechanism. A sheltered microclimate, excellent drainage, and winter covering are necessary for successful outdoor cultivation.

Container Culture

Zamia pumila makes an excellent container plant, well-suited to conservatories, bright indoor spaces, and outdoor terraces during the warm months. Use a heavy pot with drainage holes and a freely draining mix. Terracotta is preferable to plastic for its superior air exchange. Repot every two to three years in spring, moving up one pot size. Bring containers indoors before the first frost in any zone cooler than 10a.

The species tolerates average indoor humidity (around 40% relative humidity) and the dry air of heated rooms better than many tropical plants, making it a relatively undemanding houseplant.

Propagation

From Seed

Seed propagation is the primary method of reproducing Zamia pumila. Harvest seeds when the female cone begins to break apart and the bright red sarcotesta is fully developed. Remove the fleshy sarcotesta by soaking in water for 24 to 48 hours and rubbing clean (wear gloves, as the sarcotesta contains irritant compounds).

Sow seeds shallowly in a warm, moist medium of coarse perlite and peat or coir. Maintain temperatures of 25 to 30 °C for optimal germination. Germination is slow but somewhat more reliable than in some other Zamia species, and the species is described as relatively rapid-growing for a cycad under favorable conditions. A seedling heat mat improves consistency. Fresh seeds germinate more readily than stored ones.

Hand pollination between male and female plants can significantly increase seed production and viability in cultivation, where natural beetle pollinators are absent.

Division of Offsets

Mature, multi-crowned plants can be carefully divided during the growing season. Sever offsets with a clean knife, ensuring each division retains some roots. Allow cut surfaces to callus for 24 to 48 hours before potting in a well-drained medium.

Pests and Diseases

Cycad Aulacaspis Scale (Aulacaspis yasumatsui)

This devastating Asian armored scale, first detected in the Americas in the 1990s, is a severe threat to all cultivated cycads including Zamia pumila. Heavy infestations appear as a white encrustation on the undersides of leaflets and can kill plants if untreated. Management combines horticultural oil sprays, systemic insecticides (imidacloprid soil drench), and biological control agents where available.

Other Pests

Mealybugs may infest the crown and leaf bases. Various caterpillars, including those of Eumaeus atala and moths of the family Blastobasidae, feed on the leaves. Beetle pollinators (Pharaxonotha, Rhopalotria) inhabit male cones but are mutualists rather than pests.

Diseases

Crown rot and root rot caused by Phytophthora and other soilborne fungi represent the greatest disease risk, invariably linked to poor drainage or overwatering. Prevention through proper soil preparation is the only reliable strategy, as treatment of established crown rot is rarely successful.

Toxicity

All parts of Zamia pumila are toxic to humans and animals. The primary toxin is cycasin, a potent azoxyglycosid that is both carcinogenic and neurotoxic. Additional toxic compounds include macrozamin, neocycasins, and BMAA (beta-N-methylamino-L-alanine), produced by the symbiotic Nostoc cyanobacteria in the coralloid roots.

Ingestion of unprocessed plant material — particularly the seeds and starchy stem — causes severe gastrointestinal distress (vomiting, bloody diarrhea), headache, abdominal pain, liver failure, kidney failure, and potentially death. There is no specific antidote.

The Taíno and other Caribbean peoples developed elaborate detoxification protocols involving grating, repeated washing, and fermentation to render the starch safe for consumption. These techniques require precise traditional knowledge and should never be attempted without proper guidance, as incomplete toxin removal can have lethal consequences.

Dogs, cats, and livestock are at serious risk of poisoning if they ingest any part of the plant. In the Dominican Republic, wild Zamia pumila is sometimes uprooted from grazing land specifically to prevent livestock poisoning.

Conservation Status

Zamia pumila is classified as Near Threatened (NT) on the IUCN Red List of Threatened Species (assessed 2010). While the species remains present across multiple Caribbean islands, it faces mounting pressures that could elevate its threat category in future assessments.

Threats

Habitat loss is the primary threat across the entire range. In Puerto Rico, clearing for cattle ranching has destroyed large areas of suitable habitat in the south-central lowlands. In the Dominican Republic, agricultural expansion and urban development continue to reduce available habitat. In Haiti, extreme deforestation, charcoal production, and intensive land use have potentially extirpated the species entirely.

Wild harvesting for food use, particularly in the Dominican Republic, represents an additional pressure. Although the guáyiga flour tradition is a cultural heritage worth preserving, unsustainable harvest rates can deplete local populations, especially when entire underground stems are removed.

Invasive species, including the cycad aulacaspis scale (Aulacaspis yasumatsui), pose an emerging biological threat as the pest spreads through the Caribbean.

Climate change may alter rainfall patterns across the Greater Antilles, with potential consequences for the dry forest habitats where Zamia pumila occurs. More frequent and intense hurricanes could also damage populations, particularly those on exposed limestone substrates.

Conservation Measures

Zamia pumila is listed under CITES Appendix II, which regulates international trade in all cycad species. National-level protections vary across its range. In Puerto Rico, the species benefits from the broader framework of the U.S. Endangered Species Act ecosystem, though it is not individually listed as endangered.

Ex situ conservation efforts are underway at botanical institutions including the Montgomery Botanical Center in Florida, which maintains living collections and has supported molecular research on Caribbean Zamia species. The recognition of guáyiga flour by the Slow Food Foundation’s Ark of Taste program helps raise awareness of the plant’s cultural value and, by extension, the importance of conserving wild populations.

The Need for Better Data

One of the greatest challenges in conserving Zamia pumila is the incomplete state of knowledge about its actual distribution, population sizes, and genetic structure across multiple island nations. Remote areas of Haiti, central Cuba, and the Dominican interior have not been adequately surveyed. The use of toponymic data (place names derived from indigenous names for the plant) has proven to be a powerful tool for locating previously unknown populations in Puerto Rico and could be applied across Hispaniola and Cuba.

Zamia pumila and Caribbean Eumaeus Butterflies

Like its Floridian relative, Zamia pumila serves as a larval host plant for butterflies of the genus Eumaeus, specifically Eumaeus atala. The larvae feed exclusively on Zamia leaves, sequestering cycasin from the plant tissues to render themselves toxic to predators. All life stages display aposematic warning coloration — bright reds, oranges, and metallic blues — advertising their chemical defense.

The Eumaeus–Zamia mutualism in the Caribbean mirrors the coontie-Atala story in Florida: where Zamia populations decline, so do the butterflies. The conservation of wild Zamia pumila stands is therefore also a conservation imperative for Caribbean Eumaeus populations, which depend entirely on healthy cycad populations for reproduction.

Frequently Asked Questions

Is Zamia pumila the same as the Florida coontie? No. The Florida coontie is Zamia integrifolia, a distinct species. Zamia pumila is a Caribbean species found in Cuba, Hispaniola, Puerto Rico, and Jamaica. The two were erroneously lumped together under the name Zamia pumila from 1980 until molecular studies reinstated Zamia integrifolia as a separate species. Many older references and some current nursery labels still incorrectly use the name Zamia pumila for Floridian plants.

Can I grow Zamia pumila outdoors in a Mediterranean climate? With care, yes. In USDA zone 9b (e.g., the French Riviera or coastal Provence), Zamia pumila can survive outdoors in a warm, sheltered microclimate with excellent drainage and winter protection. However, it is less cold-tolerant than Zamia integrifolia and will not survive unprotected freezes. Container culture with winter relocation to a frost-free space is the safest approach.

How do I tell Zamia pumila apart from Zamia integrifolia? The most reliable field characters are the leaflet tips and the petioles. Zamia pumila has distinctly toothed leaflet tips and prickly petioles. Zamia integrifolia has entire or very faintly toothed leaflet tips and smooth, unarmed petioles. The female cones also differ: pointed and reddish in Zamia pumila, blunter and more brownish in Zamia integrifolia.

Is guáyiga flour still made today? Yes, in the eastern Dominican Republic, rural communities still prepare harina de guáyiga using traditional Taíno-derived methods. The Slow Food Foundation has recognized this flour in its Ark of Taste heritage food program. The process involves grating the toxic underground stems, repeatedly washing the pulp to remove cycasin, and drying the resulting starch. The flour is used to make chollas, arepas, and other traditional foods.

Is Zamia pumila toxic to pets? Yes, all parts of Zamia pumila are extremely toxic to dogs, cats, horses, and other domestic animals. The primary toxin, cycasin, causes severe gastrointestinal distress, liver and kidney failure, paralysis, and potentially death. There is no known antidote. Keep all Zamia species away from pets and children.

Sources and Further Reading

• Acevedo-Rodríguez, P. & Strong, M.T. (2012). Catalogue of seed plants of the West Indies. Smithsonian Contributions to Botany, 98: 1–1192.
• 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.
• Franz, N.M. & Skelley, P.E. (2008). Pharaxonotha portophylla (Coleoptera: Erotylidae), new species and pollinator of Zamia (Zamiaceae) in Puerto Rico. Caribbean Journal of Science, 44(3): 321–333.
• 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.
• Osborne, R., Calonje, M.A., Hill, K.D., Stanberg, L. & Stevenson, D.W. (2012). The world list of Cycads. Memoirs of the New York Botanical Garden, 106: 480–510.
• Pagán-Jiménez, J.R. & Lazcano-Lara, J.C. (2013). Toponymic data helps to reveal the occurrence of previously unknown populations of wild Zamia pumila L. on volcanic substrates in South Central Puerto Rico. Ethnobiology Letters, 4(1): 52–58.
• POWO (2026). Zamia pumila L. Plants of the World Online. Royal Botanic Gardens, Kew. https://powo.science.kew.org/
• Slow Food Foundation. Guayiga Flour — Ark of Taste. https://www.fondazioneslowfood.com/
• Whitelock, L.M. (2002). The Cycads. Timber Press, Portland.
• IUCN Red List of Threatened Species. Zamia pumila. https://www.iucnredlist.org/