o4 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVEESITY 



Low and simple from an erect scaly rootstock. Stem erect, 5-7 cm. high, about 

 equalling the leaves, 1-3-flowered, nearly leafless. Basal leaves with petioles 3-6 cm. long, 

 digitately 5-foKolate, silky and greenish above, white-tomentose beneath ; leaflets .5-2 cm. 

 long, oblong-cuneate, margins entire, except at the very apex, where there are 2 (seldom 4) 

 notches making the leaflets 3- (seldom 5-) toothed at the apex, the middle tooth generally 

 the smallest. Flowers about 1 cm. in diameter. Hypanthium silky ; bractlets and sepals 

 ovate or lance-ovate, the former smaller. Petals obovate, merely truncate. 



This much resembles P. concinna, but is more delicate, not at all spreading, has a 

 subscapiform stem and smaller flowers, but the most striking difference is the form of the 

 leaflets. 



New Mexico : C. D. Walcott, No. 66, 1883 (Type). 



Colorado: E. L. Greene, 1875. 



28 Potentilla concinnaeformis. 



Illustrations: Plate 15, f. 6; dissection of flower, /. 7; pistil, /. 8; stamen, /. 9; 

 fruiting hypanthium and calyx, /. 10. 



Stems from a scaly caudex, about 1 dm. high, ascending, slightly silky-strigose, sub- 

 scapose. Lower stipules scarious and brown, those of the small stem leaves ovate. 

 Basal leaves numerous, densely silvery silky on both sides and slightly tonientose be- 

 neath, digitate, of about 7 leaflets. Stem leaves small, simple or ternate; leaflets 1-2 cm. 

 long, oblong-cuneate, crenate except at the base. Hypanthium silky-villous, in fruit 

 about 5 mm. in diameter. Bractlets oblong-lanceolate, about a third shorter than the 

 broadly lanceolate sepals. Petals yellow, obcordate, a third longer than the sepals. 

 Stamens about 20. 



It most resembles P. concinna, but is more silky and less tomentose and its stems 

 are not prostrate. It has been labelled P. Wheeleri, from which it is easily distinguished 

 by its denser and appressed silky pubescence, the tomentum of the lower surface of the 

 leaves, and the sepals, which are not incurved in fruit. It is a native of the San Fran- 

 cisco Mountains of Arizona. 



Arizona: J. G. Lemmon, No. 3294 (Mt. Agassiz, 10000 ft.), Aug. 1881; Mr. and 

 Mrs. Lemmon, Sept., 1884. 



§ 7- SUBVISCOSAE. 



29. Potentilla Wheeleri Wats. 



Potentilla Wheeleri Wats. Proc. Am. Acad. 11: 148. 1876. 



Wats. Bot. Cal. 1: 179; Rattan, An. Key. W. Coast Bot. 51; Greene, Fl. Fran. 



