Rydberg : Further Studies on the Potentilleae 177 



hypanthium and the calyx, is only slightly silky, not at all tomen- 

 tose ; the cyme in well-developed specimens is more open and 

 flat -topped ; and the upper segments of the leaves are decurrent 

 and sometimes confluent, which is never the case in P. Hippiana. 

 By the latter characters it approaches P. ambigens Greene. From 

 this it differs in the appressed pubescence, the smaller flowers and 

 the less coarsely toothed segments. Baker's no. 390, as repre- 

 sented in the herbarium of the New York Botanical Garden, was 

 named P. ambigens by Professor Greene, but belongs unquestion- 

 ably to this species. 



Horkelia Chandleri sp. nov. 



A low silky perennial with very thick and woody root and 

 short cespitose caudex with erect branches densely covered by the 

 remains of old leaves. Stems scapiform, slender, silky villous, 

 7-16 cm. high: basal leaves numerous, 4-5 cm. long, densely 

 silky, terete, worm-like from the numerous small crowded seg- 

 ments : flowers about 4 mm. in diameter, rather many in sub- 

 capitate dense clusters, hypanthium cup-shaped, as well as the 

 calyx densely villous : bractlets linear, about two thirds as long as 

 the triangular-ovate sepals: petals yellow, linear, 1.5 mm. long, 

 shorter than the sepals : stamens mostly 5 : filaments subulate- 

 filiform. 



This species closely resembles H. Mitirii in the leaves and the 

 thick root and caudex : but differs in the taller scape, the more 

 numerous flowers, the longer bractlets, and the narrower linear 

 petals. The type grew at an altitude of about 3450 m. 



California: Mt. Goddard, iqoo, Hall & Chandler, 700. 



S 



Drymocallis gracilis sp. nov. 



A tall and slender, glandular pubescent perennial with a more 

 or less cespitose caudex. Stem about 6 dm. high, glandular- 

 pilose throughout, branched above : basal and lower stem -leaves 

 pinnately 7-9-foliolate, 1-3 dm. long : leaflets obovate to flabelh- 

 form, 1-5 cm. long, coarsely incised, except at the bases, sparingly 

 pubescent on both surfaces : upper stem-leaves 3-5-foholate, 

 subsessile: pedicels slender, .5-4 cm. long, very glandular: 

 hypanthium and calyx glandular : bractlets linear, about half as 

 long as the lanceolate acuminate sepals ; these in fruit often 8 mm. 

 Jong : petals white, small, broadly obovate, scarcely exceeding the 

 sepals : stamens, 20-2 c : style slightly fusiform. 



D 



and 



