Yucca arkansana Trelease ssp. arkansana
Arkansas Yucca.Mo. Bot. Gard. Ann. Rep. 13: 63.1902.
Synonymy
Yucca angostifolia var. mollis Engelmann. - Trans. Acad. Sci. St. Louis, 3: 51.1873.Yucca glauca mollis Branner & Coville. - Ann. Rept. Geol. Surv. Arkansas for 1888, 4: 224.
Lectotype: (chosen by MCKELVEY) ENGELMANN 182 from near Little Rock, Arkansas (MO).
Other representative material studied.
| Oklahoma: | fh 605.5, Beckam Co., 500m; |
| Texas: | fh1179.48, Ady, 1,060m; fh 1180.50, Hondo, 300m; fh 1180.52, Cherry Spring, 600m; fh 1180.98, Amarillo Area, 1,000 m, fh 1180.99, Denton Creek, 750m; |
| Arkansas | fh 1180.51, Blevins, 700 m; in the collection of Horst Küzler, New Mexico. |
Key to the Subspecies of Yucca arkansana
| 1. | Acaulescent, panicles with few branches towards the base, leaves thickened, pistil green, inflorescence usually to 1m long, leaves 1-2cm wide, grows on stony hills and inclines | ssp. arkansana | |
| Panicles with many branches | 2 | ||
| 2. | Inflorescence 1 - 2.5 m long, leaves 2-3 cm wide, growing in sandy terrain | ssp.louisianensis | |
| Inflorescence 1 - 1.8m long, leaves 1-4cm wide | ssp.freemanii | ||
Yucca arkansana, fh 1180.98, May 1999, Amarillo area, TX., 1000m,
in flower at the end of May