Yucca utahensis McKelvey

S. D. McKelvey (1938–1947) suggested that Yucca utahensis is most closely related to Y. elata, from which it differs primarily in growth habit, capsule size, and leaf width, although with overlaps. S. L. Welsh et al. (1993) considered it equally or more closely related to Y. angustissima var. kanabensis, but DNA evidence (K. H. Clary 1997) suggests a closer relationship with Y. elata. J. M. Webber (1953) believed that Y. utahensis is a hybrid between Y. elata and Y. angustissima. The plants that are caulescent or subcaulescent were recognized by J. L. Reveal (1977c) as Y. elata var. utahensis; those that are acaulescent, or infrequently caulescent and with racemose inflorescences, he included in Y. angustissima.

Plants forming large colonies, caulescent or appearing acaulescent, not distinctly arborescent, 1.2–2.8 m; rosettes usually large. Stems often procumbent, usually 7 or more per colony, thick, 0.6–1.3 m. Leaf blade yellow-green, linear-lanceolate, plano-convex or plano-keeled, widest near middle, 20–70 × 0.7–2.2 cm, flexible, margins entire, curled, filiferous, whitish, apex tapering to short spine. Inflorescences paniculate, sometimes distally racemose, arising beyond rosettes, narrowly ellipsoid, 10–15 dm; branches 1–2 dm; bracts erect; peduncle scapelike, 1–1.6 m, 2.5–4.5 cm diam. Flowers pendent; perianth campanulate; tepals distinct, creamy white, broad-elliptic or ovate, 4–5 × 2–2.5 cm; filaments 2–2.5 cm; anthers 2–3 mm; pistil 2.5–3.5 cm; style white, 5–10 mm; stigmas lobed. Fruits erect, capsular, dehiscent, oblong-cylindric, 5–6 × 2–2.5 cm, dehiscence septicidal. Seeds dull black, thin.

Ariz., Nev., Utah.

Flowering spring.

Desert and desert hillsides and canyons, often sandy places; 700--2000m.

Yucca elata Engelmann var. utahensis (McKelvey) Reveal

Yucca utahensis is a species in the family Asparagaceae, native to Utah, Nevada and Arizona. McKelvey

Yucca utahensis can reach a height of 10 feet (3 m), though it is usually much smaller. Stems are sometimes procumbent, often several per colony, forming colonies of several individuals. Leaves are narrow and needle-like, up to 70 cm long but rarely more than 2 cm wide, with fibers separating along the margins. Flowers are creamy white, nodding, bell-shaped. Fruit is a dry capsule with black seeds.