Mimosa ionema Robinson

Mimosa ionema B. L. Robinson, Proc. Am. Acad. 36: 473. 1901.
A shrub or small tree, 3-5 m. high, the twigs puberulent, unarmed. Stipules filiform, 8 mm. long; petioles 4-6 mm. long, puberulent; pinnae 4-8 pairs; leaflets about 15 pairs, oblong, 5-6 mm. long, 1.5-2 mm. wide, glabrous or nearly so, delicately pinnately veined; peduncles axillary, slender, often clustered, 2-3 cm. long; spikes slender, 5-6 cm. long; corolla white, or pale yellow, 2.5 mm. long, glabrous; stamens 8 or 10; young legume oblong, 5 cm. long, about 7 mm. wide, glabrous, acute at both ends.
Type locality: Near Cuemavaca, Morelos. Distribution: Morelos and Guerrero.