Mimosa malacophylla A. Gray

Mimosa malacophylla A. Gray, Journ. Bost. Soc. Nat. Hist 6: 182. 1850.
A vine-like, pubescent shrub, 3-4.5 m. long, armed with many, short, reflexed prickles. Petiole and rachis short-prickly; pinnae 3-5 pairs; leaflets 3-6 pairs, oval to oblong, or obovate, 7-14 mm. long, acute or obtuse, pubescent on both sides; heads often in terminal racemes; peduncles 1-3 cm. long; flowers capitate, white; corolla pubescent; stamens twice as many as the corolla-lobes; legume oblong, 5-7.5 cm. long, 8-10 mm. wide, glabrous, long-stipitate, several-jointed.
Type locality: Near the Rio Grande, western Texas. Distribution: Texas to Tamaulipas and Nuevo Leon.

Perennial, Shrubs, Vines, twining, climbing, Taproot present, Nodules present, Stems or branches arching, spreading or decumbent, Stems prostrate, trailing, or mat forming, Stems less than 1 m tall, Stems 1- 2 m tall, Stems greater than 2 m tall, Trunk or stems armed with thorns, spines or prickles, Stems solid, Stems or young twigs glabrous or sparsely glabrate, Stems or young twigs sparsely to densely hairy, Stems with hooked uncinate hairs or prickles, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules setiform, subulate or acicular, Stipules persistent, Stipules free, Leaves compound, Leaves bipinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves glabrous or nearly so, Leaves hairy on one or both surfaces, Flowers solitary in axils, or appearing solitary, Inflorescences racemes, Inflorescences globose heads, capitate or subcapitate, Inflorescence axillary, Inflorescence terminal, Flowers actinomorphic or somewhat irregular, Calyx 5-lobed, Calyx glabrous, Petals united, valvate, Petals white, Imperfect flowers present, dioecious or polygamodioecious, Stamens 9-10, Fertile stamens 6-8, Fertile stamens 5, Stamens completely free, s eparate, Stamens long exserted, Filaments glabrous, Style terete, Fruit a legume, Fruit a loment, jointed, separating into articles, Fruit stipitate, Fruit unilocular, Fruit freely dehiscent, Fruit elongate, straight, Fruit oblong or ellipsoidal, Fruit strongly curved, falcate, bent, or lunate, Fruit exserted from calyx, Fruit compressed between seeds, Fruit spiny, bur-like, with hooked bristles or prickles, Fruit glabrous or glabrate, Fruit 3-10 seeded, Seed with elliptical line or depression, pleurogram, Seeds subquadrate, Seed surface smooth, Seeds olive, brown, or black.

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