Yucca elata Engelmann ssp.elata
Bot. Gaz. 7:17.1882.Soaptree Yucca - Stateflower of New Mexico
Synonymy
Yucca angustifolia var. radiosa Engelmann. - In King: Rep. Geol. Explor. 40th Parallel 5: 496. 1871.Yucca angustifolia var. elata Engelmann. - Trans. Acad. Sci. St. Louis 3: 50.1873.
Yucca radiosa (Engelmann) Trelease. Mo. Bot. Gard. Ann. Rep. 13: 56.1902.
Lectotype: (selected by MCKELVEY) ROTHROCK 382, from the Expedition of 1874 of Explorations and Surveys west of the 100th Meridian, Camp Grant, (according to MCKELVEY) in Graham Co., Arizona. (U. S.)
Other representative material studied.
| New Mexico: | fh 1176.1, Union Co., 1,500m; fh 1178.10, Carizzo Mts., 1,900m; fh 1178.33, Las Cruces Area, 1,400m; fh 1179.84, Pedernal Mts., 2,000m. |
| Arizona: | fh 1178.39, Cottonwood, 1,600m; |
| Texas | fh 1178.29, Del City, Texas, 1,200m: fh 1179.30, Alpine Area, Texas, 1,500m; fh 1179.31, Cornudas, Texas, 1,030m; fh 1179.85, Wild Horse Draw |
Key to the Subspecies of Yucca elata
| I. | Inflorescence less than 2 m tall, leaves flexible, seeds sculptured | ssp.utahensis | |
| Inflorescence up to 3 m tall | 2 | ||
| 2. | Tree-like or caulescent, leaves flexible, seeds smooth | ssp. elata | |
| Acaulescent or with a very short stem, leaves stiff, seeds sculptured | ssp. verdiensis | ||
Yucca elata, fh 1178.29, Del City, TX, 1,200m,
blooming in May.