146 MEMOIRS FEOM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



generally less than .5 cm. long, 2-4-cleft to the base into oblong-oval segments. Cyme 

 at first dense, in age open, dichotomously branched, but with nearly sessile flowers. 

 Hypanthium cup-shaped or turbinate, villous, in age 4 mm. in diameter; bractlets linear- 

 lanceolate, about a third shorter than the broadly lanceolate acuminate sepals. Petals 

 yellow, spatulate, a little exceeding the sepals. 



The original specimens are less densely silvery than most of later collections ; those 

 collected by M. K. Curran are nearly identical with the type. It is a native of the 

 mountains of northern and central California. 



California: Wilkes' Exp., No. 1572 (type) ; Bolander & Keller, 1872; J. G. Lem- 

 mon, Nos. 60 and 70, 1874 ; No. 96, 1875 ; M. K. Curran, 1887. 



34. Horkelia unguiculata (Gray). 



Ivesia unguiculata Gray, Proc. Am. Acad. 7 : 339. 1868. 



Wats. King's Rep. 5: 448; Brewer & Wats. Bot. Cal. 1 : 183 (in part). 



Potentilla unguiculata Greene, Pittonia, 1 : 105. 1887. 



Greene, Fl. Fran. 1 : 68 (partly). 



Potentilla cilinta Greene, Pittonia, 1 : 103. 1887. 



Illustrations : Plate 87, f. 1; dissection of flower,/. 2; stamen, /. 3; pistil,/. 

 4; fruiting hypanthium and calyx,/. 5. 



Root deep and thick, crowned with a short erect scaly rootstock. Stems several, more 

 or less brown, sparingly silky-villous, simple, ascending or decumbent, 3-4 dm. high. 

 Stipules pectinately divided, rather large. Basal leaves numerous, somewhat grayish but 

 not densely silky with long hairs, pinnate, with numerous crowded pairs of leaflets, these 

 .5-.75 cm. long, divided to the base into linear-oblong or linear acute segments. Cyme 

 dense, subcapitate. Hypanthium cupulate, slightly silky, 4 mm. in diameter ; bractlets 

 lanceolate, slightly shorter than the broadly lanceolate sepals. Petals white, broadly 

 spatulate, exceeding the sepals. 



I can not separate Potentilla ciliata Greene, from H. unguicidata. I have seen the 

 single type specimen, collected by Dr. Kellogg, in the Owen Valley, 1873, and it does not 

 differ from Gray's and Bolander's specimens (?". e., the type specimens of H. unguiculata), 

 except in shghtly longer leaflets and narrower sepals. P. ciliata is described as having 

 10 stamens; that this is not a normal condition may be seen from the fact that opposite 

 some of the sepals there are two stamens as in H. unguiculata, while opposite most of them 

 there is only one, which is generally placed a little to one side. 



H. unguiculata is a native of the Sierra Nevada. The following specimens have 

 been examined : 



