348 NORTH AMERICAN FLORA [VoLumME 22 
mm. long; petals obovate, retuse, a little exceeding the calyx, 5-6 mm. long; stamens 20; 
pistils many; styles short, glandular and thickened at the base. 
TYPE LOCALITY: Melville Island. 
DISTRIBUTION: Spitzbergen, Greenland, arctic coast of North America, and Wrangel Island, 
off the coast of Siberia. 
ILLUSTRATIONS: Lehm. Monog. Potent, Suppl. 1: £2. 7, f. 7; FI. Dan. p/. 2234; Mem. Dep. 
Bot. Columbia Univ. 2: 2.36, f. 6-10. 
164. Potentilla paucijuga Rydberg, sp. nov. 
Perennial, with a short caudex; stems about 2 dm. high, tinged with purple, somewhat 
villous-hirsute, ascending or decumbent; basal leaves pinnate, with 5 leaflets; petioles 
villous-hirsute with spreading hairs, 4-5 cm. long; terminal leaflet broadly obovate, 
2-2.5 cm. long, sessile, green but densely hairy above, white-tomentose and silky beneath, 
divided two thirds to the midrib into linear or oblong, acutish divisions; lateral leaflets 
similar but smaller; stem-leaves 1 or 2, trifoliolate, short-petioled ; stipules lanceolate, 
1-1.5 cm. long; cyme 10-13-flowered; hypanthium yellowish-villous; bractlets linear, 
2-3 mm. long, acute; sepals lanceolate, acute, 5 mm. long; petals yellow, broadly obovate, 
emarginate, about 6 mm. long; stamens about 20; pistils many; styles short, glandular 
and slightly thickened at the base. 
Type collected on grassy slopes in the La Sal Mountains, Utah, at an altitude of 2700-3300 m., 
in 1899, C. A. Purpus 251, in part (U. S. Nat. Herb. zo. 505062, in part). 
165. Potentilla multifida L. Sp. Pl. 496. 1753. 
Fragaria multifida Crantz, Inst.2: 176. 1766. 
Cespitose perennial; stems many from the caudex, low, at last spreading, generally less 
than 2 dm. high, appressed silky-strigose ; stipules large, lanceolate, acuminate, more or 
less scarious and brown ; leaves pinnate, with 5-7 leaflets, grayish-tomentose beneath, 
smooth above; leaflets pectinately divided to very near the midrib into linear acute revolute 
divisions; hypanthium silky-strigose, in fruit 5-7 mm. in diameter; bractlets oblong- 
lanceolate, acute, a little shorter than the ovate-lanceolate acute sepals, which are 3-4 mm. 
long; petals cuneate, emarginate, a little exceeding the sepals, 4-5 mm. long; stamens 
about 20; pistils many; styles short, scarcely thickened at the base. 
TYPE LOCALITY: Siberia. 
DISTRIBUTION : Northern and alpine Europe and Asia, and subarctic America west to Great. 
Slave Lake. 
ILLUSTRATIONS: Mus. Helv. 1: p/. 8; Britt. & Brown, Wl. Fl. 7. 1971; Mem. Dep. Bot. 
Columbia Univ. 2: £1. 37, f. 6-10. 
166. Potentilla pseudosericea Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 98. 1898. 
Potentilla holosericea Nutt.; Rydb. loc. cit., as asynonym. Not P. holosericea Griseb. 1843. 
Cespitose perennial; stems several from the caudex, ascending or decumbent, 5-10 cm. 
high, few-leaved, grayish-silky ; lower stipules brown and scarious, covering the caudex; 
upper ones small, 5 mm. long, ovate, silky; leaves with rather short petioles, pinnate, 
with 5-9 approximate leaflets, grayish-silky or hirsute above, white-tomentose and silky 
beneath ; leaflets 1-2 cm. long, obovate in outline, divided to near the midrib into linear 
obtuse segments; cyme few-flowered ; hypanthium grayish-silky, in fruit about 5 mm. in 
diameter ; bractlets oblong, shorter than the ovate or ovate-lanceolate sepals, which are 4-5 
mm. long; petals obovate, about equaling the sepals ; stamens 20 ; pistils numerous ; styles 
short, thickened and glandular at the base. 
TYPE LOCALITY: Rocky Mountains. 
DISTRIBUTION : Wyoming and Colorado to Nevada. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: p/. 36, f. 1-3. 
167. Potentilla bipinnatifida Dougl.; Hook. Fl. Bor. 
Am. 1: 188. 1833. 
Potentilla arguia Lehm. Monog. Potent. 62. 1820. Not P. argufa Pursh. 1814. 
Potentilla pennsylvanica arguia Seringe, in DC. Prodr. 2: 581. 1825. 
