Rep. (Annual) Missouri Bot. Gard 4: 208. 1893
Illustrator: Bee F. Gunn
Phenology: Flowering spring.
Habitat: Desert, chaparral, desert woodland coastal sage
Elevation: 300–2500 m
Calif., Mexico (Baja California).
Within Hesperoyucca whipplei, W. Trelease (1893) recognized two varieties, A. L. Haines (1941) and P. A. Munz (1959) each recognized five subspecies, and J. M. Webber (1953) recognized four varieties based on growth form. Others (S. D. McKelvey 1938–1947; K. K. McKinney and J. C. Hickman 1993) have argued that growth form in this species is highly variable, and have questioned the desirability of recognizing any infraspecific taxa at all in H. whipplei.