Desmanthus cooleyi (Eaton) Trel.

Acuan cooleyi (Eaton) Britton & Rose
Acacia Cooleyi Eaton, Man. ed. 5. 89. 1829.
Desmanthus Jamesii T. & G. Fl. N. Am. 1: 402. 1840.
Desmanthus Jamesii Fendleri S. Wats. Smithson. Misc. Coll. 258: 214. 1878,
Desmanthus Cooleyi Branner & Coville, Rep. Geol. Surv. Ark. 1888'; 178. 1891.
Acuan Fendleri Heller, Cat. N. Am. PI. ed. 2, 106. 1900. Shrubby, decumbent or ascending, 2-5 dm. long, the angled stems and branches glabrous or puberulent. Stipules setiform, minute, 1-2 mm. long, or wanting; leaves 3-4 cm long; petiole and rachis puberulent or glabrate; pinnae 2-7 pairs, with an orbicular gland between the lower pair; leaflets 8-15 pairs, oblong or linear-oblong, 3-4 mm. long, acutish or mucronulate, ciliate, at least when yoimg, the delicate midvein somewhat excentric; peduncles about 2 cm. long, or shorter, sometimes very short; heads several-many -flowered ; stamens 10; legumes solitarj' or few, linear, straight or a little curved, 3-7 cm. long, about 3 mm. wide, pointed.
Type locality: Sources of the Canadian River, New Mexico. Distribution: Nebraska and Oklahoma to Texas, Arizona and Durango.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Taproot present, Nodules present, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems solid, Stems or young twigs glabrous or sparsely glabrate, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Extrafloral nectary glands on petiole, Stipules inconspicuous, absent, or caducous, Stipules deciduous, Stipules free, Leaves compound, Leaves bipinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves glabrous or nearly so, Inflorescences globose heads, capitate or subcapitate, Inflorescence axillary, Bracts very small, absent or caducous, Flowers actinomorphic or somewhat irregular, Calyx 5-lobed, Calyx glabrous, Petals un ited, valvate, Petals white, Petals greenish yellow, Imperfect flowers present, dioecious or polygamodioecious, Stamens 9-10, Stamens completely free, separate, Stamens long exserted, Filaments glabrous, Style terete, Fruit a legume, Fruit unilocular, Fruit freely dehiscent, Fruit elongate, straight, Fruit twisted, Fruit coriaceous or becoming woody, Fruit exserted from calyx, Valves twisting or coiling after dehiscence, Fruit glabrous or glabrate, Fruit 3-10 seeded, Fruit 11-many seeded, Seed with elliptical line or depression, pleurogram, Seed surface smooth, Seeds olive, brown, or black.

Desmanthus cooleyi là một loài thực vật có hoa trong họ Đậu. Loài này được (Eaton) Trel. miêu tả khoa học đầu tiên.