Yucca angustissima Engelmann ex Trelease ssp.avia (Reveal) Hochstätter
Cactaceae-Review 1 (2): 21.1998.Avia Yucca
Basionym: Yucca angustissima Engelmann ex Trelease var. avia Reveal. - Intermountain Flora, Vascular Plants of the Intermountain West: 534-536.1977.
Type: M.E. JONFS 5639a Loa Pass, Piute Co., Utah, 2,550 m elev., 17 July 1898. (U.S.).
Other representative material studied.
| Utah: | fh 1179.29, Fish Lake Hightop Plateau, 2,600m; fh 1179.81, Loa Pass area, 2,500m; fh 1179.82, Doctor Creek area, 2,700m. |
Yucca angustissima ssp.avia, fh 1179.81, Loa Pass area, Utah, 2,500m, in bloom late in June