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FNA | Family List | FNA Vol. 26 | Agavaceae | Yucca

13. Yucca reverchonii Trelease, Rep. (Annual) Missouri Bot. Gard. 22: 102, plate 108. 1911 (as reverchoni).

San Angelo yucca

Plants solitary or forming dense, open colonies of rosettes, acaulescent, with branching subterranean caudices; rosettes 2–10 per colony, each rosette with fewer than 100 leaves. Leaf blade lanceolate, straight, slightly concave, nearly flattened, widest at middle, 25–60 × 1–2(–2.5) cm, rigid, slightly glaucous, margins denticulate, yellow or reddish brown, hyaline. Inflorescences narrowly paniculate, arising beyond rosettes, narrowly ovoid, 3.5–10 dm, densely pubescent; bracts erect; peduncle sometimes scapelike, 0.5–1.1 m, less than 2.5 cm diam. Flowers pendent; perianth campanulate; tepals distinct, white or greenish white, ovate, 4–6 × 1.5–3 cm, apex sharply acuminate; filaments 1.8–3.2 cm; pistil 3–4.5 cm × 4–6 mm; style white or greenish, 10–20 mm; stigmas lobed. Fruits erect, capsular, dehiscent, ellipsoid, 4–6 × 1.8–3.2 cm, dehiscence septicidal. Seeds dull black, thin, 5–7 mm diam.

Flowering late spring. Rocky hillsides, limestone ledges, gravelly plains with dense brush; 400--900 m; Tex.

Yucca reverchonii is endemic to the Edwards Plateau. J. M. Webber (1953) reported apparent hybrids of this species with Y. rupicola and Y. thompsoniana. S. D. McKelvey (1938–1947) indicated that Y. reverchonii occupies an area of the Plateau between those of Y. rupicola and Y. thompsoniana. K. H. Clary (1997) presented DNA evidence that confirms a close relationship among these three species as distinct entities.


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