312 NORTH AMERICAN FLORA [VoLuME 22 
32. Potentilla grosseserrata Rydberg, sp. nov. 
Potentilla Nuttallii S. Wats. Bot. King's Expl. 5: 88, in part. 1871. ; 
Potentitla Blaschkeana Rydb. Mem. Dep. Bot. Columbia Univ. 2: 69, in part. 1898. 
Perennial, with a woody root and short caudex; stem stout, 5-7 dm. high, densely 
pubescent with appressed or ascending hairs; basal leaves digitately 7-foliolate ; petioles 1- 
3 dm. high, densely and coarsely pubescent with appressed or ascending hairs; leaflets 
oblanceolate, the larger 5-8 cm. long, rather copiously pubescent with short appressed hairs 
but green on both sides, strongly veined, coarsely serrate with triangular teeth, which are 
directed forward but usually more or less curved outward; stipules lanceolate, falcate, 1-2 
cm. long, entire or slightly toothed; inflorescence many-flowered, open and flat-topped ; 
hypanthium hirsute, in fruit 6~7 mm. broad; bractlets linear-lanceolate, about 3mm. long, 
acute; sepals 5-7 mm. long, ovate-lanceolate, acuminate; petals obcordate, 6-7 mm. long; 
stamens 20; pistils many; styles filiform. 
Type collected in the state of Washington, in 1899, G. Rk. Vasey 322 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION : Washington to northern Nevada and northern California. 
33. Potentilla rectiformis Rydberg, sp. nov. 
Perennial, with the habit of P. vecta and P. sulphurea ; stem 6-10 dm. high, densely 
strigose ; leaves, except those of the inflorescence, 7-foliolate ; petioles with appressed pubes- 
cence; leaflets oblanceolate or spatulate, 4-6 cm. long, coarsely cut-toothed with lanceolate 
teeth curved forward, appressed-pubescent on both sides or glabrate above; stipules ovate, 
deeply cut-toothed, 1.5-2 cm. long; inflorescence many-flowered, flat-topped ; hypanthium | 
strigose, in fruit 7~8 mm. broad; bractlets linear-lanceolate, 5-7 mm. long, about equaling 
the ovate-lanceolate acuminate sepals ; petals obcordate, 6-7 mm. long; stamens about 20; 
pistils many; styles filiform, 
Type collected on grassy gravelly flats at Pullman, Washington, in 1896, A. D. FE. Elmer 69, 
DisTRIBUTION: Type locality and vicinity, also adjacent Idaho and Montana. 
34. Potentilla etomentosa Rydb. Bull. Torrey Club 24: 8. 1897. 
Perennial, with a thick, somewhat cespitose caudex; stem 4-5 dm. high, slightly 
appressed-hairy, erect; stipnles ovate to lanceolate, entire; leaves with long petioles, dig- 
itate, of about 7 leaflets, glabrate above, slightly silky-strigose beneath but without any . 
trace of tomentum ; leaflets elliptic-oblanceolate, 3-5 cm. long, crenate or serrate with ovate 
teeth; hypanthium hirsute, in fruit 6 mm. broad; bractlets oblong or lanceolate, a little 
shorter than the ovate pointed sepals, which are 4-5 mm. long; petals obcordate, scarcely 
exceeding the sepals, 5-6 mm. long; stamens 20; pistils many; styles filiform. 
TYPE LOCALITY: California. 
DISTRIBUTION: California and western Nevada. 
35. Potentilla jucunda A. Nelson, Bull. Torrey Club 27: 32. 1900. 
Perennial, with a more or less céspitose caudex; stem slightly appressed-pubescent, 
slender, 4-7 dm. high; basal leaves several, digitately 5-7-foliolate ; petioles 5-20 cm. long, 
slightly strigose; leaflets 4-7 cm. long, obovate-oblanceolate, green on both sides, nearly 
glabrous above, slightly appressed-silky beneath, coarsely serrate with lanceolate teeth ; 
stem-leaves smaller, on shorter petioles or the uppermost sessile; cyme open, many- 
flowered ; hypanthium softly pubescent, in fruit about 7 mm. wide; bractlets linear-lanceo- 
late, a little shorter than the broadly lanceolate sepals, which are 4-6 mm. long; petals 
broadly obcordate, 8-10 mm. long; stamens about 20; pistils many; styles filiform. 
TYPE LOCALITY: Green Top, Laramie Hills, Wyoming. 
DISTRIBUTION : Mountains from Montana to Colorado and Utah. 
36. Potentilla amadorensis Rydberg, sp. nov. 
Perennial, with a tap-root and short caudex; stems 3-4 dm. high, ascending, sparingly 
appressed-pubescent ; basal leaves 5-foliolate; petioles about 1 dm. long, strigose; leaflets 
obovate, 2-4 cm. long, serrate with ovate teeth, green, appressed-pubescent with short 
