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

18b. Yucca angustissima var. avia Reveal in A. Cronquist et al., Intermount. Fl. 6: 534. 1977.

Plants acaulescent to short-caulescent. Stems erect, to 2 m. Leaf blade lanceolate, 40–60 cm, apex long-tapering. Inflores-censes racemose, 8–18 dm; peduncle 0.3–0.5 m. Flowers 3.5–4.5(–5.2) cm; style 7–10 mm. Capsules deeply constricted, 3.5–5.5 cm.

Flowering late spring--early summer. Loamy, rocky soils; 2500 m; Utah.

J. L. Reveal (1977c) separated var. avia from var. kanabensis, and believed it to be more closely related to var. angustissima. S. L. Welsh et al. (1993) considered var. avia to be a northern, high elevation variant at the end of a cline within the species. It occurs in loamy, rocky soils instead of the sandy soils that the other varieties inhabit. Little is known about this variety.


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