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 

 amplitudeof 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. Calif arnica* 

 which has further been applied to very diverse things. 

 If it were certain that the brief foliage description given by 

 Greenland 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 f Wood, from the 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. J 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 forms that M. Andre 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). 



t This name had been applied, in 1837, to the plant subsequently 

 named Dasylirion graminifolium. 



J Kept. Mo. Bot. Gard. 4: 2U.pl. 17, 23. 

 Rev. Hort. 56 : 324. pi. 



