176 Rydberg : Further Studies on the Potentilleae 



equal : petals obcordate, yellow, about 8 mm. long, nearly twice 

 as long as the sepals. 



This species is a member of the concinna group and nearest 

 related to P. couciiuiifornm ; but is larger ; the leaflets are greener 

 and more glabrous above and the bractlets are longer. By the 

 size it approaches the gracilis group. 



Mexico : Pringle, 68 go. 



Potentilla Hallii sp. nov. 



A more or less villous-hirsute ascending or decumbent peren- 

 nial with a short rootstock or caudex : stem about 3 dm. long, 

 sparingly villous-hirsute, terete and light green : leaves mostly 

 digitately 5-foliolate or the upper 3-foliolate or simple : basal ones 

 with petioles 3-5 cm. long : leaflets obovate, 1—3 cm. long, 

 coarsely serrate-crenate, green and slightly hairy above : paler, 

 hirsute and sparingly tomentulose beneath : upper stipules ovate, 

 entire, 12-15 mm. long: cyme rather open: hypanthium and 

 calyx hirsute, more or less tinged with purple : bractlets ovate- 

 lanceolate about one third shorter than the ovate acute sepals : 

 petals yellow, about 5 mm. long, scarcely exceeding the sepals : 

 stamens 20. 



This species is nearest related to P. fastigiata, but is greener 

 and with a more open cyme. As to the pubescence of the leaves, 

 it resembles P. viridescens ; but is in every respect smaller and 

 the stem is not erect. On account of its small size, it could 

 just as well be referred to the maadata group as to the graciles. 

 The type grew at an altitude of about 1600 m. 



California : Pine Ridge, Fresno County, 1900, Hall & 

 CJiandler, 182. 



Potentilla propinqua 



Potentilla diffusa A. Gray, Mem. Am. Acad. 1849 : 41. 1849. 

 Not Willd. 



P. Hippiaiia, var. diffusa Lehm. Ind. Sem. Hort. Bot. Hamb. 

 1849 : 8. 



P.Hippiana, \-a.x . propinqua Rydb. Bull. Torr. Club, 24: 3. 1897. 



The original specimens were rather depauperate and the most 

 prominent characters which separate it from P. Hippiana were not 

 noticed by me when I prepared my Monograph of the North 

 American Potentilleae. The plant is much greener than P. Hip- 

 piana ; the upper surface of the leaves, as well as the pedicels. 



