330 NORTH AMERICAN FLORA [VoLUME 22 
above, densely white-tomentose beneath; leaflets narrowly oblanceolate, 3-5 cm. long, ser- 
rate with small forwardly directed teeth ; stem-leaves trifoliolate or simple ; stipules brown 
and decurrent,the free portion long, linear-lanceolate; hypanthium silky and white-tomen- 
tose; bractlets narrowly lanceolate, nearly equaling the similar sepals; petals yellow, 
broadly obcordate, exceeding the sepals by about one third; stamens 20; pistils many ; 
styles short, filiform. 
TYPE LOCALITY : Southwestern Chihuahua. 
DISTRIBUTION : New Mexico and Chihuahua. 
99. Potentilla bicrenata Rydb. Bull. Torrey Club 23: 431. 1896. 
Perennial, with a tap-root and short caudex, simple or cespitose; stem erect to spreading, 
5-7 cm. high, about equaling the leaves, 1-3-flowered, nearly leafless ; basal leaves with 
petioles 3-6 cm. long, digitately 5-foliolate, silky and greenish above, white-tomentose 
beneath; leaflets 0.5-3 cm. long, oblong-cuneate, the 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; hypan- 
thium silky; bractlets lanceolate, about 3 mm. long; sepals ovate or lance-ovate, about 4 
mm. long; petals obovate, truncate or emarginate, 5-6 mm. long; stamens about 20; 
pistils many ; styles filiform, short. 
TYPE LOCALITY : New Mexico. 
DISTRIBUTION : Dry hills from New Mexico to ne 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: pi. i, f. 15. 
100. Potentilla divisa Rydberg, sp. nov. 
Potentilla nivea dissecta S. Wats. Proc. Am. Acad. 8: 559, at least in part. 1873. Not P. dissecta 
Pursh, 1814. 
Potentilla concinna divisa Rydberg, Bull. Torrey Club 23: 431. 1896. 
Perennial, with a thick root and short cespitose woody caudex ; stems spreading or 
diffuse, 5-10 cm. long, more or less pubescent with long, white, usually appressed or 
ascending hairs; basal leaves 5-foliolate, digitate, or pinnate with approximate leaflets; 
petioles 1-3 cm. long, white-pubescent; leaflets 1-2 cm. long, obovate or oblanceolate in 
outline, deeply cleft with oblong or lanceolate divisions, pubescent above with long white 
hairs and sometimes slightly tomentulose, densely white-tomentose beneath; stem-leaves 
usually ternate ; stipules lanceolate, 5-10 mm. long; hypanthium villous, in fruit 5-6 mm. 
wide; bractlets lanceolate, acute or obtusish, 3-4 mm. long; petals broadly cuneate, 
emarginate, about 5 mm. long; sepals ovate, about 4 mm. long; stamens about 20; pistils 
many ; styles filiform, short. 
TYPE LOCALITY : Rocky Mountains of British America. 
DISTRIBUTION : Dry hills from the Black Hills of South Dakota to Saskatchewan, Alberta, and 
Colorado. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: p/. 14, f. 6. 
101. Potentilla quinquefolia Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 76. 1898. 
Potentilla nivea hale edad Lehm. Delect. Sem. Hort. Hamb. 1850: 12.* 1850. Not P. pen- 
taphylia Richt. 1815. 
Poientilla nivea quinguefolia Rydb. Bull. Torrey Club 23: 302. 1896. 
Potentilla subquinata Rydb. Bull. Torrey Club 28: 181, in part. 1901. 
Perennial, with a rather short and thick rootstock or caudex; stems generally several, 
ascending, 1.5-2 dm. high, rather loosely silky-villous, more or less tinged with brown ; 
basal leaves rather many, with silky-villous petioles 3-5 cm. long, 5- (seldom 3-) foliolate, 
usually with the terminal leaflet short-petiolulate, silky-villous above, white-tomentose 
beneath ; stem-leaves trifoliolate; leaflets broadly obovate, cleft about halfway to the mid- 
rib into oblong segments, 1.5-3 cm. long; stipules large, ovate, 0.5-1 cm. long; hypanthium 
loosely silky; bractiets linear-lanceolate, somewhat shorter than the lanceolate sepals, about 
4 mm. long; petals obovate, emarginate, a little exceeding the sepals; stamens about 20; 
pistils many; styles short, filiform or slightly thickened at the base. 
TYPE LOCALITY : [British] North America. 
DISTRIBUTION: Mountains and hills from Saskatchewan to ee Columbia, Colorado, and Utah. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: fl. 3 
