Potentilla lupina

Potentilla lupina Rydberg, sp. nov
Perennial, with a short caudex ; stem 3-4 dm. high, nearly erect, densely grayishpubescent with coarse ascending hairs; basal leaves pinnate with about 7 approximate leaflets ; petioles 5-7 cm. long, grayish-pubescent like the stem ; leaflets oblanceolate, 2-5 cm. long, coarsely crenate with ovate teeth, densely grayish-pubescent on both sides with rather coarse appressed hairs and tomentulose beneath ; stem-leaves similar but smaller, short-petioled and only 3-5-foliolate ; cyme open, with about a dozen flowers ; hypanthium villous-hirsute, in fruit 7 mm. broad ; bractlets lanceolate, about 3 mm. long ; sepals lanceovate, acuminate, 5-7 mm. long; petals obcordate, about equaling the sepals ; stamens about 20 ; pistils many ; styles filiform.
Type collected on the eastern slope of Big Horn Mountains, Wyoming, near the headwaters of Clear Creek and Crazy Woman River, in 1900, Frank Tweedy 3215 (herb. N. Y. Bot. Gard.). Distribution : Type locality and vicinity.