Potentilla durangensis Rydb.

Potentilla durangensis Rydberg, sp. nov
Perennial, with a thick woody short caudex; stems erect, about 3 dm. high, pilose,, with long, yellowish, reflexed or divaricate hairs and glandular-atomiferous ; basal leavesnumerous, digitately 5-7-foliolate ; petioles 6-12 cm, long, pilose and glandular-atomiferous, their bases thick, brown and leathery ; stipules adnate, free portion linear-lanceolate, attenuate, about 1 cm. long; leaflets linear-oblong or linear-oblanceolate, crenate, 2-4 cm. long, 5-10 mm. wide, rounded at the apex, acute at the base, green, pilose, and glandular-atomiferous above, more or less tomentulose beneath ; lower stem-leaves similar but smaller, the upper ones subsessile and 3-foliolate ; cyme rather dense ; hypanthium and calyx pilose and atomiferous ; bractlets linear-oblong, obtuse, 4 mm. long; sepals ovate, acute, about 6 mm. long ; petals bright-yellow, broadly obovate, emarginate, about 7 mm. long; pistils many ; styles filiform ; stamens about 20.
Type collected at Quebrada Honda, Durango, May 20, 1906, Edward Palmer 223 (herb. N. Y.. Bot. Gard.).