40 MISSOURI BOTANICAL GARDEN. 
From all other Yuccas it differs in the slender style rising 
abruptly from the top of the ovary and capitately enlarged 
into a papillate stigma, and in possessing somewhat gluti- 
- nous pollen, as well as in certain capsular characters, which 
led Dr. Engelmann * to give it the sectional name Hespero- 
yucca, which both Mr. Baker and the writer have proposed 
to employ as a generic name. 
Though the mountain and valley forms vary greatly in 
amplitude of panicle, etc., only one species of Hesperoyucca 
appears capable of characterization, and this has long been 
in cultivation in European gardens, partly under the name 
Yucca Whipplei and partly under the name Y. Californica, 
which has further been applied to very diverse things. 
If it were certain that the brief foliage description given by 
Groenland in 1858 really refers to this plant, the specific 
name Californica has a slight priority over the name 
Whipplei, which though written in 1858 was not published 
until the following year, but the propriety of this substitu- 
tion of name is open to considerable question. 
Y. graminifolia t Wood, fromthe vicinity of Los Angeles,. 
though the leaves are described as more flaccid, can hardly 
refer to other than the typical form, which to the north of 
Los Angeles becomes very large, and the name is not there- 
fore applicable to the plant that is abundant about San 
Bernardino, e. g. at Arrowhead Springs and in the Cajon 
pass, as I at one time thought might be the case.{ This 
latter plant very frequently has the flowers shaded with 
purple or violet, and it was to one of the most pronounced of 
these tinted formsthat M. André in 1884 applied the name 
Y. Whipplei violacea,§ though the name stands for too 
inconstant a character to have more than horticultural 
value. 
* Bot. King. 497. (1871). 
+ This name had been applied, in 1837, to the plant subsequently 
named Dasylirion graminifolium. 
t Rept. Mo. Bot. Gard. 43 215. pl. 17, 23. 
§ Rev. Hort. 56 324. pl. 
