Geum mexicanum Rydb.

Geum mexicanum Rydberg, sp. nov
Perennial, with a short thick rootstock; stem 3-5 dm. high, more or less hirsute and puberulent, branched above; branches ascending; basal leaves with 7-11 principal leaflets, often with smaller interposed ones, sparingly hirsute on both sides; terminal leaflet large, reniform or suborbicular, more or less round-lobed and crenate, sometimes 3-cleft, 3-7 cm. broad; lateral leaflets sessile, orbicular or rounded-obovate, 1.5-4 cm. long; stem-leaves 3-7foliolate; leaflets oblanceolate, obovate, or rhombic; stipules obliquely ovate, coarsely toothed; bractlets 2-3 mm. long, linear, lance-linear, or subulate; sepals about 6 mm. long, ovate, short-acuminate, reflexed after anthesis; petals golden-yellow, orbicular, about 7 mm. long; fruiting head nearly 2 cm. broad; receptacle short-hairy; body of the achenes about 3 mm. long, sparingly hirsute; lower internode of the style purplish, about 5 mm. long, with a few hairs below, not glandular; upper internode 1.5 mm. long, sparingly short-hairy.
Type collected on Mount Orizaba, Mexico, at an altitude of 3000 m., August 8, 1891, Henry E. Seaton 251 (U. S. Nat. Herb.).
Distribution: Mountains, from Vera Cruz to Hidalgo.