Yucca elata |
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palmella, soap-tree yucca, soap-weed yucca |
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Habit | Plants solitary or forming small colonies of rosettes, caulescent or rarely acaulescent, distinctly arborescent, mostly few-branched, 1.2–4.5 m; rosettes usually large, symmetrical or asymmetrical. | ||||
Stems | 1–7 per colony, erect, thick, 1–1.5(–2.5) m. Leaf blade pale green, linear, widest near middle, 25–95 × 0.2–1.3 cm, flexible, margins entire, curled, filiferous, whitish, apex tapering to short spine. |
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Inflorescences | mostly paniculate, sometimes distally racemose, arising beyond rosettes, mostly narrowly ovoid to ovoid, 7–15 × 2.5–6.5 dm; branches 0.7–3.5 dm; bracts erect; peduncle sometimes scapelike, 1–2 m, 2.5–5.5 cm diam. |
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Flowers | pendent; perianth campanulate or globose; tepals distinct, creamy white, often tinged green or pink, narrow to broadly elliptic or ovate, 3.2–5.7 × 1.3–3.2 cm; filaments 1.5–2.5(–3.2) cm, pubescent; anthers (2–)2.5–4.8 mm; pistil 2–3.2 × 0.6–1 cm; style white or pale green, 6–11 mm; stigmas lobed. |
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Fruits | erect, capsular, dehiscent, oblong-cylindric, symmetrical or rarely constricted, 4–8.2 × 2–4 cm, dehiscence septicidal. |
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Seeds | dull black, thin, 7–11(–14) mm diam. |
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Yucca elata |
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Distribution |
North America; Mexico
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Discussion | Varieties 2 (2 in the flora). J. L. Reveal (1977c) reduced S. D. McKelvey’s (1938–1947) Yucca utahensis and Y. verdiensis to varieties of Y. elata based primarily u!pon growth forms. J. M. Webber (1953) considered that these taxa are populations of hybrids between members of the Y. glauca alliance of the Great Plains and Y. elata of the American Southwest. Reveal believed that Webber did not provide adequate justification for his hybrid hypothesis. K. H. Clary (1997, pers. comm.) believes that Y. utahensis is genetically distinct from Y. elata and Y. verdiensis, based on DNA evidence and the morphological characters of style, stigma, fruit, and leaf. Her DNA evidence shows that Y. elata and Y. verdiensis are sister taxa, while Y. utahensis is not. Although there is a great range of variation within Y. elata as circumscribed here, the two varieties recognized are difficult to distinguish. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 26, p. 432. | ||||
Parent taxa | Agavaceae > Yucca | ||||
Sibling taxa | |||||
Subordinate taxa | |||||
Name authority | Engelmann: Bot. Gaz. 7: 17. (1882) | ||||
Web links |