Mimosa mellii Britton & Rose

Mimosa chiapensis Britton, sp. nov
Woody; branches stout; twigs pilose; prickles stout, flat, distant, 6-8 mm. long. Petioles pilose, 7-10 mm. long; pinnae 1 pair; rachilla pilose; leaflets 7-12 pairs, obliquely oblonglanceolate, 8-12 mm. long, 2.5-3.5 mm. wide, pubescent on both sides, sparingly setose beneath and on the margins, the apex sharply acute, the base rounded, the midvein excentric; peduncles axillary and in terminal clusters, slender, pilose, about 2 cm. long, or .shorter; heads small, globose; bractlets scarcely longer than the buds; flowers 4-parted, pubescent; stamens 4.
River bottom, Monserrate, Chiapas, May, 1925, Purpus 10313.

Mimosa oaxacana Britton & Rose, sp. nov
A slender, woody vine, 3-7 m. long, the branches terete, puberulent. Stipules minute; petioles slender, 1-3 cm. long; pinnae 1 pair; leaflets 10-16 pairs, oblong, 10-15 mm. long, about 3 mm. wide, acute, puberulent on both sides, the margin appressed-setose, pale beneath, not glaucous, strongly veined, the midvein excentric; peduncles axillary, slender, 2-3 cm. long; flowers capitate ; calyx and corolla glabrous ; flowers 4-parted ; stamens 4.
Between Guichocovi and Lagunas, Oa,aca, June 27, 1895, Nelson 2746.

Mimosa mellii Britton & Rose, sp. nov
A small tree, up to 5 m. high, the twigs glabrous, prickly, or nearly unarmed. Petioles only 2-3 mm. long; pinnae 1 pair; leaflets 10-15 pairs, linear, 6-8 mm. long, 1-1.5 mm. wide, acute, pale beneath, glabrous, the margin bearing appressed bristles; peduncles glabrous, 1.5-2 cm. long; flowers capitate; legume oblong, 1.5-2 cm. long, about 6 mm. wide, the valves and margins densely long-setose, otherwise glabrous, 2-4-jointed.
Near Chivela, Oaxaca, January, 1927, C. D. Mell 2.

Mimosa doylei Britton & Rose, sp. nov
A shrub, 3-4 m. high, somewhat prickly, the young parts pubescent. Stipules narrow, persistent; petioles 1.5 cm. long or less; pinnae 1 pair; leaflets 15-25 pairs, narrowly oblong to oblanceolate, 10-12 mm. long, about 2 mm. wide, appressed-pubescent on both sides, setose beneath, the margins with appressed bristles; peduncles slender, 2-3 cm. long; flowers capitate; stamens 5; legume 2-4 cm. long, 5-6 mm. wide, long-setose, acuminate, few-jointed.
Chiapas. Type from Los Pinos, December 12, 1906, C. B. Doyle 56.