If you know the Edwards Plateau of central Texas, you know a landscape of bleached limestone, scattered live oaks, and the relentless drone of cicadas in summer. It is here, on gravelly flats and rocky ledges between the ranges of Yucca rupicola to the east and Yucca thompsoniana to the west, that Yucca reverchonii quietly holds its ground — a small, stemless yucca so discreet that it was not formally described until 1911, more than half a century after the first Texas yuccas entered the botanical record. Known in the trade as the San Angelo yucca, this species belongs to the genus Yucca and represents one of the least known yet most refined members of the series Rupicolae: a compact, rigid-leaved rosette plant with a restrained elegance that deserves far more attention from collectors and xeriscape designers than it currently receives.
Quick Facts
| Scientific name | Yucca reverchonii Trel. |
| Family | Asparagaceae (subfamily Agavoideae) |
| Origin | Texas (Edwards Plateau) and northeastern Mexico (Coahuila; possibly Nuevo León, Tamaulipas) |
| Adult size | Rosettes 30–50 cm tall × 40–60 cm wide; flower stalk 0.5–1.1 m |
| Hardiness | −15 °C (5 °F) to −18 °C (0 °F) / USDA zones 6b–10 |
| IUCN | Not formally assessed (predicted “not threatened” — Bachman et al., 2024) |
| Cultivation difficulty | 2/5 |
Taxonomy and Nomenclature
Yucca reverchonii was described by the American botanist William Trelease in 1911 (published 1912) in the Report (Annual) Missouri Botanical Garden, volume 22, page 102, plate 108. The original spelling used by Trelease was “reverchoni” (with a single terminal i), later standardized to reverchonii following modern nomenclatural practice.
The specific epithet honors Julien Reverchon (1837–1905), a remarkable French-born botanist who emigrated from Diémoz (near Lyon, France) to Texas in 1856 as part of the utopian fourierist colony of La Réunion, near Dallas. Reverchon became one of the most prolific and meticulous collectors of Texas flora in the 19th century, amassing over 20,000 specimens representing more than 2,600 species. His collection, considered one of the finest of its kind in the world at the time of his death, was acquired by the Missouri Botanical Garden. Asa Gray honored him by naming the genus Reverchonia after him in 1879. Several other plant species also bear his name — Yucca reverchonii being among the most notable.
Classification. Within the genus Yucca, the species is placed in section Chaenocarpa (capsular-fruited yuccas) and series Rupicolae (Hochstätter). This series groups the small, acaulescent to short-trunked yuccas of the Edwards Plateau and adjacent northeastern Mexico. DNA evidence presented by Clary (1997) confirms that Yucca reverchonii, Yucca rupicola, and Yucca thompsoniana form a closely related trio of distinct species within this series. McKelvey (1938–1947) noted that Yucca reverchonii occupies an area of the Edwards Plateau geographically intermediate between the ranges of the other two.
Family and subfamily. Asparagaceae, subfamily Agavoideae (APG IV, 2016). Older references may cite Agavaceae.
Synonyms
POWO lists no synonyms for this species. Yucca reverchonii has occasionally been treated by some authors as a possible natural hybrid between Yucca rupicola and Yucca thompsoniana, but molecular data (Clary 1997) support its recognition as a distinct species.
Common Names
English: San Angelo yucca. No widely established common names exist in other languages. The name “San Angelo yucca” refers to the city of San Angelo, Texas, near the western limit of the species’ range on the Edwards Plateau.
Infraspecific Taxa
No varieties or subspecies are recognized. The species is treated as monotypic.
Morphological Description
Habit and Caudex
Yucca reverchonii is a small, acaulescent (stemless) perennial that grows either as a solitary rosette or, more commonly, in dense, open colonies formed through a branching subterranean caudex. Colonies typically contain 2 to 10 rosettes, each bearing fewer than 100 leaves. There is no above-ground trunk. Like its close relative Yucca rupicola, each individual rosette is monocarpic — it flowers once, then dies — but the colony persists and slowly expands through vegetative offset production from the underground caudex.
Leaves
The leaves are the primary diagnostic feature distinguishing Yucca reverchonii from its close relatives. They are lanceolate, straight (with little or no twist), slightly concave to nearly flat, widest at the middle, and measure 25–60 cm long and only 1–2 (rarely 2.5) cm wide. This narrow width — typically under 15 mm in most populations — gives the rosette a distinctly fine-textured, grass-like appearance compared to the broader leaves of Yucca rupicola (1.7–4 cm wide) or Yucca pallida (2–5 cm wide).
The leaf texture is rigid, in marked contrast to the soft, flexible, fleshy leaves of Yucca rupicola. The color is slightly glaucous (grey-green), subtly different from the bright olive-green of Yucca rupicola. The margins are finely denticulate (minutely saw-toothed), bordered by a narrow band that is yellow or reddish brown and hyaline (translucent). Importantly, the leaf margins lack both filaments (curling white threads, as in Yucca filamentosa) and the pronounced twist of Yucca rupicola. The leaf tip terminates in a sharp spine.
Inflorescence and Flowers
The inflorescence is a narrow panicle arising from the center of the rosette on a scapelike peduncle 0.5–1.1 m tall and less than 2.5 cm in diameter. The panicle itself is narrowly ovoid, 35–100 cm long, and notably densely pubescent — a distinguishing character, as the panicles of Yucca rupicola are glabrous. Bracts are erect.
Individual flowers are pendant (drooping) and campanulate (bell-shaped). The six tepals are distinct (not fused), white to greenish white, ovate, 4–6 cm long and 1.5–3 cm wide, with sharply acuminate tips. Filaments measure 1.8–3.2 cm; the pistil is 3–4.5 cm long and 4–6 mm wide; the style is white or greenish, 10–20 mm long, with lobed stigmas. Flowering occurs in late spring.
Pollination, as with all Yucca species, requires the obligate mutualism with yucca moths (Tegeticula spp.).
Fruits and Seeds
The fruit is an erect, dry, dehiscent capsule, ellipsoid in shape, 4–6 cm long and 1.8–3.2 cm in diameter. Dehiscence is septicidal. Seeds are dull black, thin, approximately 5–7 mm in diameter.
Similar Species and Frequent Confusions
Yucca reverchonii occupies a geographic and morphological position intermediate between two close relatives. This has led some botanists to question whether it is a species in its own right or a stabilized hybrid — a debate that DNA studies have resolved in favor of full species status.
Yucca rupicola Scheele — Twisted-leaf Yucca
The species most easily confused with Yucca reverchonii is Yucca rupicola.
Yucca rupicola shares the acaulescent, clumping habit, denticulate margins, and similar size, but differs in its significantly broader leaves (1.7–4 cm vs. 1–2 cm), flexible and fleshy (rather than rigid) leaf texture, bright olive-green color, and the pronounced twisting of mature leaves. The inflorescence of Yucca rupicola is glabrous, whereas that of Yucca reverchonii is densely pubescent. Natural hybrids between the two species have been reported where their ranges overlap.
Yucca thompsoniana Trel. — Thompson’s Yucca
Yucca thompsoniana differs fundamentally in habit: it is caulescent, developing a distinct trunk up to 1–3 m tall, often branched, whereas Yucca reverchonii is strictly acaulescent. The leaves of Yucca thompsoniana are similar in width (1–2 cm) and rigidity but are borne in a dense, symmetrical head atop the trunk. Hybrids between the two species are also documented (Webber, 1953).
Yucca constricta Buckley — Buckley’s Yucca
Another acaulescent Edwards Plateau species that shares the narrow, rigid leaves. Yucca constricta can be distinguished by its filamentous leaf margins (curling white threads) and the characteristically constricted (narrowed) capsule fruit — a feature absent in Yucca reverchonii, which has ellipsoid, unconstricted capsules.
Comparative Table
| Character | Yucca reverchonii | Yucca rupicola | Yucca thompsoniana |
|---|---|---|---|
| Habit | Acaulescent, clumping | Acaulescent, clumping | Caulescent, trunked (1–3 m) |
| Leaf width | 1–2 (–2.5) cm | 1.7–4 cm | 1–2 cm |
| Leaf texture | Rigid | Flexible, fleshy | Rigid |
| Leaf twist | None or minimal | Strong, increasing with age | None |
| Leaf color | Slightly glaucous (grey-green) | Olive-green to pale green | Blue-green to grey-green |
| Inflorescence pubescence | Densely pubescent | Glabrous | Variable |
| Leaf margin | Denticulate, no filaments | Denticulate, no filaments | Minutely denticulate to smooth |
Distribution and Natural Habitat
Yucca reverchonii is endemic to the Edwards Plateau of central Texas according to the Flora of North America, with POWO extending the native range to include Coahuila in northeastern Mexico. Wikipedia cites a considerably broader Mexican distribution including Tamaulipas, Nuevo León, Chihuahua, Durango, Zacatecas, Aguascalientes, and San Luís Potosí — though the limits of this extended range are debated and may partly reflect confusion with closely related taxa. The core distribution remains the central and western Edwards Plateau, where the species occurs at elevations of approximately 400 to 900 meters above sea level.
Within the Edwards Plateau, Yucca reverchonii inhabits rocky hillsides, limestone ledges, and gravelly plains amid dense brush. McKelvey (1938–1947) noted that its range falls between that of Yucca rupicola (concentrated in the southeastern Edwards Plateau) and Yucca thompsoniana (found further west, extending into the Trans-Pecos). The substrate is invariably calcareous — shallow, rocky limestone soils, often with exposed bedrock or caliche.
Associated species include Juniperus ashei (Ashe juniper), various Quercus species (oaks), Prosopis glandulosa (honey mesquite), Opuntia spp., Nolina texana, and native grasses such as Bouteloua curtipendula (sideoats grama). The name “San Angelo yucca” reflects the proximity of the species to San Angelo, a city on the western edge of the Edwards Plateau where the Concho River flows through rolling, semi-arid rangeland.
Conservation
Yucca reverchonii has not been formally assessed by the IUCN Red List. However, a predictive extinction risk model published by Bachman et al. (2024) classifies it as “not threatened” with a confident rating. The species is not listed under CITES.
Within its Edwards Plateau range, Yucca reverchonii appears to be locally common on suitable limestone substrates, though it is rarely abundant. The principal long-term threats are the same as those affecting other Edwards Plateau yuccas: habitat fragmentation from urban expansion (particularly around San Angelo, Austin, and San Antonio), overgrazing by livestock, brush encroachment by Ashe juniper, and the progressive decline of yucca moth populations, which threatens the species’ ability to set seed.
Cultivation
| Parameter | Value |
|---|---|
| Hardiness | −15 °C to −18 °C (5 to 0 °F) / USDA zones 6b–10 |
| Light | Full sun |
| Soil | Well-drained, calcareous, rocky or gravelly; tolerates poor, nutrient-depleted substrates |
| Watering | Very low; highly drought-tolerant once established |
| Adult size | 30–50 cm (H) × 40–60 cm (W), excluding flower stalk |
| Growth rate | Slow |
| Difficulty | 2/5 |
Light
Unlike its close relative Yucca rupicola, which tolerates partial shade, Yucca reverchonii is a full-sun species. In the wild, it grows on exposed, rocky hillsides and open gravelly plains rather than in the shaded understorey of oak-juniper woodland. In cultivation, provide the sunniest position available. Insufficient light will result in lax, etiolated growth and reduced flowering.
Soil and Drainage
Excellent drainage is essential — even more so than for many other yuccas, given this species’ association with shallow, rocky, limestone substrates in the wild. A gritty, mineral-based mix is ideal: garden soil amended with generous quantities of coarse sand, fine gravel, or crushed limestone. The species thrives in alkaline to neutral pH and tolerates extremely poor, nutrient-depleted soils. Avoid organic-rich composts and moisture-retentive substrates. Heavy clay is tolerable only on a pronounced slope or raised mound where water never accumulates around the crown.
Watering
Less water is better. Yucca reverchonii is among the most drought-tolerant of the Edwards Plateau yuccas. Once established, it requires virtually no supplemental irrigation in climates with 300+ mm of annual rainfall. In container culture, allow the substrate to dry out completely between waterings. Overwatering, particularly in combination with cool temperatures, is the surest way to lose this species.
Cold Hardiness — Documented Experiences
Published hardiness data for Yucca reverchonii are limited, owing to the species’ rarity in cultivation outside specialist collections. The specialist nursery Woodlanders lists it as zones 7–9, while Yucca Do Nursery has reported it as cold-hardy in Wichita, Kansas — a zone 6b location where winter lows can reach −18 °C (0 °F).
The underlying biology supports moderate cold hardiness. The entirely subterranean caudex benefits from the thermal inertia and insulation of the soil, providing far more frost protection to the growing points than a trunked yucca receives. Combined with the species’ native habitat — the Edwards Plateau, where freezing spells and occasional ice storms are not uncommon in winter — a practical cold limit of approximately −15 to −18 °C (5 to 0 °F) in well-drained mineral soil seems realistic.
Key factors for cold survival: The same principles that apply to Yucca rupicola hold here. Perfect drainage, avoidance of winter irrigation, and a dry mineral mulch (gravel, crushed limestone) over the crown are the most effective strategies for improving cold tolerance. In borderline zones (USDA 6b), a position against a south-facing wall provides valuable additional warmth.
Container Growing
The compact rosette and slow growth of Yucca reverchonii make it well suited to container culture. Use an unglazed terracotta pot with generous drainage holes and a very gritty substrate — a mix of 50–60% pumice or perlite, 20–30% mineral sand, and 10–20% potting soil. In cold-winter climates (USDA zone 6 and below), overwinter containers in an unheated greenhouse or cold frame. The species does not require winter warmth — cool, bright, dry conditions are ideal.
Growth Rate
Yucca reverchonii is a slow grower. Expect several years from seedling to flowering-size rosette. Offset production is gradual, and colonies develop at a leisurely pace over many years. This is a plant for patient gardeners — but the reward is a long-lived, low-maintenance specimen that never outgrows its place.
What to Know Before Buying
Availability. Yucca reverchonii is rare in the horticultural trade. It is occasionally listed by specialist native-plant nurseries in Texas (notably Yucca Do Nursery and Woodlanders) and by a handful of cold-hardy cactus and succulent suppliers. It is seldom found in mainstream garden centers.
Seeds vs. plants. Seeds are sporadically available from specialist suppliers or seed exchanges. Germination is improved by a 24-hour warm-water soak prior to sowing. Seedling growth is slow. Purchasing a well-rooted plant in a 1-liter pot from a reputable nursery is the most efficient path to establishment.
Pitfalls to avoid. Given the documented occurrence of natural hybrids with both Yucca rupicola and Yucca thompsoniana in the wild, plants of ambiguous provenance should be viewed with caution. True Yucca reverchonii has narrow (under 2 cm wide), straight, rigid, slightly glaucous leaves with denticulate margins and no filaments. If the leaves are broad and twisted, you likely have Yucca rupicola. If the plant develops a visible trunk, it is more likely Yucca thompsoniana or a hybrid. Always purchase from nurseries with documented provenance.
Propagation
Seeds
Sow fresh seeds in a well-drained mineral mix (e.g., 50% perlite, 50% sterilized compost). Soak seeds for 24 hours in warm water before sowing. Maintain a temperature of 20–25 °C and keep the substrate barely moist. Germination is slow and irregular, taking from 2 weeks to several months. Pot seedlings individually once they have 2–3 true leaves.
Offsets
Offsets emerge from the subterranean caudex and can be detached with a sharp, clean knife when they have developed their own root system. Allow the cut surface to callus for 2–3 days in a dry, shaded spot before planting into a gritty substrate. Water sparingly until new growth confirms establishment.
Division
Mature colonies can be divided in early spring by carefully excavating the branching caudex and separating individual rosettes, each with a portion of root. This method is effective but should be done carefully to minimize damage to the shallow root system.
Pests and Diseases
Yucca reverchonii is exceptionally trouble-free in cultivation when its basic requirements — full sun, excellent drainage, minimal watering — are met.
Root and crown rot (Fusarium, Phytophthora): The most common cause of loss. Invariably caused by excessive moisture around the crown or root zone, especially during cool weather. Prevention through good drainage and restrained watering is the only effective strategy.
Mealybugs (Pseudococcus spp.): Occasionally colonize the tightly packed leaf bases. Treat with a cotton swab dipped in rubbing alcohol for light infestations, or apply a systemic insecticide for heavier outbreaks.
Agave snout weevil (Scyphophorus acupunctatus): Although not a primary host, Yucca reverchonii could potentially be affected in gardens where this devastating pest attacks nearby agavoids. Preventive treatment of susceptible neighboring plants reduces the risk.
Scale insects: Occasionally encountered. Remove manually or treat with horticultural oil.
Deer: The rigid, spiny foliage is highly deer-resistant, though the flowers may be browsed.
Landscape Use
Yucca reverchonii is a connoisseur’s plant — understated, architecturally refined, and perfectly suited to situations where larger or more aggressive yuccas would be out of scale.
Rock gardens: The ideal use. The narrow, straight, slightly glaucous leaves create a tight, fine-textured rosette that looks perfectly at home among limestone boulders. Plant in full sun with perfect drainage and minimal competition from surrounding vegetation.
Xeriscape and gravel gardens: An excellent structural accent in low-water landscapes. The grey-green foliage complements gravel mulches, crushed limestone, and other mineral surfaces.
Native plant gardens and prairie restorations: Pair with native Edwards Plateau companions such as Bouteloua curtipendula, Schizachyrium scoparium, Salvia farinacea, Oenothera macrocarpa, and Opuntia spp. for an authentic Hill Country planting.
Container culture: The compact size and slow growth make Yucca reverchonii an outstanding long-term container specimen for sun-baked terraces and patios.
Collector’s gardens: An essential species for anyone building a comprehensive Yucca collection, particularly of the series Rupicolae. The opportunity to grow the three closely related Edwards Plateau species — Yucca reverchonii, Yucca rupicola, and Yucca thompsoniana — side by side makes a fascinating botanical display that illustrates speciation within a single landscape.
Frequently Asked Questions
Is Yucca reverchonii a hybrid between Yucca rupicola and Yucca thompsoniana?
This hypothesis was considered plausible for decades, given the species’ morphological and geographic intermediacy. However, DNA analysis by Clary (1997) confirmed that Yucca reverchonii is a distinct species, not a stabilized hybrid. The three species are closely related within series Rupicolae and do hybridize in the wild where their ranges overlap, but Yucca reverchonii has its own genetic identity.
How does Yucca reverchonii differ from Yucca rupicola?
Three key differences: the leaves of Yucca reverchonii are narrower (1–2 cm vs. 1.7–4 cm), straight rather than twisted, and rigid rather than flexible. The inflorescence is densely pubescent, whereas that of Yucca rupicola is glabrous. And the leaf color is slightly glaucous (grey-green) rather than bright olive-green.
Is Yucca reverchonii easy to find in nurseries?
No. This species is rare in the trade and seldom available outside specialist native-plant and cold-hardy succulent nurseries in the United States. Seed is occasionally offered through specialist exchanges. If you encounter this species at a nursery, it is worth purchasing — availability is unpredictable.
Can I grow Yucca reverchonii in Europe?
In theory, yes — in Mediterranean climates (USDA zone 8b and above) with excellent drainage, it should thrive in a sunny, sheltered position. However, the species is virtually unknown in European horticulture. European growers interested in this species will likely need to source seed from American contacts. As with all Edwards Plateau yuccas, winter wet is a greater threat than winter cold in European conditions.
Who was Reverchon?
Julien Reverchon (1837–1905) was a French-born botanist who emigrated to Texas from Diémoz, near Lyon, as a young man. He became one of the most important collectors of 19th-century Texas flora, compiling over 20,000 specimens. His collection was acquired by the Missouri Botanical Garden. Reverchon Park in Dallas is named in his honor.
Reference Databases and Online Resources
- POWO — Yucca reverchonii
- Flora of North America — Yucca reverchonii
- Tropicos — Missouri Botanical Garden
- iNaturalist
- Lady Bird Johnson Wildflower Center
- GBIF — Yucca reverchonii
Bibliography
Geiser, S.W. (1928). Naturalists of the Frontier: II. Julien Reverchon. Southwest Review 14(3): 331–342.
Trelease, W. (1911, publ. 1912). Yucca reverchonii. Report (Annual) Missouri Botanical Garden 22: 102, plate 108.
Trelease, W. (1902). The Yucceae. Report (Annual) Missouri Botanical Garden 13: 27–133.
McKelvey, S.D. (1938–1947). Yuccas of the Southwestern United States. 2 volumes. Arnold Arboretum, Harvard University.
Webber, J.M. (1953). Yuccas of the Southwest. USDA Agriculture Monograph No. 17. Washington, D.C.
Hess, W.J. & Robbins, R.L. (2002). Yucca. In: Flora of North America Editorial Committee (eds.), Flora of North America North of Mexico, vol. 26: 423–439. Oxford University Press.
Clary, K.H. (1997). Phylogeny, character evolution, and biogeography of Yucca L. (Agavaceae) as inferred from plant morphology and sequences of the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA. Ph.D. dissertation, University of Texas at Austin.
Molon, G. (1914). Le Yucche. Ulrico Hoepli Editore, Milano. 247 pp.
Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N. & Walker, B.E. (2024). Extinction risk predictions for the world’s flowering plants to support their conservation. New Phytologist.