76 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



lower stipules ; upper stipules green, ovate, entire. Basal leaves many, digitately 5- (sel- 

 dom 3-) foliolate with an additional pair of smaller leaflets on the petiole, about 1 cm. 

 below the others ; leaflets 1-4 cm. long, oblong or obovate, deeply incised into oblong 

 rather obtuse segments, silky and green above, silky and white-tomentose beneath. Stem 

 leaves generally ternate, few and reduced in size. Hypanthium silky-hirsute, in fruit 

 5-8 mm. in diameter ; bractlets ol:>long, obtuse or acute, about a third shorter than the 

 ovate-triangular acuminate sepals. Petals broadly obcordate, exceeding the sepals. Sta- 

 mens about 20. Style filiform, nearly terminal. Achenes smooth. 



As before noted this somewhat resembles the species of the gracilis group, especially 

 P. fa-<<ti(jiata in size and P. pulcherriraa in the form of the leaflets and the pubescence. 

 The latter has digitate or more or less pinnate leaves with approximate leaflets, but they 

 are never, as in P. subjugu, digitately 5-foUolate with a pair of smaller ones some distance 

 below. In P. subjuga, the leaflets are more deeply incised and the stem and branches 

 stricter, and the latter rather divergent; they are few-flowered, as in P. nivea, from which 

 the plant differs in the number of the leaflets. 



Colorado: X. H. Patterson, No. 192, 1892 (from near Empire, type); 1885 (from 

 Gray's Peak); C. S. Crandall, No. 184, 1892 (from Graymont); T. C. Porter, No. 44; 

 Hall and Harbour, No. 160, mainly; No. 161, 1862. 



57. Potentilla quinquefolia. 



PofenfiUa nivea 'pentajjJnjUa Lehm. Nov. Stirp. Pug. 9 : 69. 1851. Not P. [jentaphylla 

 Richt. 1815. 



Lehm. in Hook. Fl. Bor. Am. 1: 195; Turcz. Bull. Soc. Nat. Moscow, 16: 607*; 

 Lehm. Rev. Pot. 169; AValp. Ann. 2 : 509. 



Potentilla nivea quinejuefolia Rydb. Bull. Torr. Bot. Club, 23: 302. 1896. 



Illustratioxs: Plate jn, f. i; dissection of flower,/. 3; stamen,/. 3; pistil,/ 4 ; 

 fruiting hypanthium and calyx, f. 5. 



Rootstock rather short and thick; stems generally several, ascending, 1.5-2 dm. 

 high, rather loosely silky-viUous, more or less tinged with brown. Basal leaves rather 

 many, with silky-villous petioles 3-5 cm. long, 5- (seldom 3-) foliolate, generally with the 

 terminal leaflet short-petiolate, silky-villous above, white-tomentose beneath. Stem 

 leaves trifoliolate ; leaflets broadly obovate, cleft about half way to the midrib into ob- 

 long segments, 1.5-3 cm. long; stipules large, ovate, .5-1 cm. long. Hypanthium 

 loosely Silky ; bractlets hnear-lanceolate, somewhat shorter than the lanceolate sepals. 

 Petals obo^-ate, emarginate, a little exceeding the sepals. Stamens about 20. Pistils 

 many; style short, filiform or slightly thickened at the base. 



