Eysenhardtia orthocarpa (A. Gray) S. Watson

Eysenhardtia orthocarpa (A. Gray) S. Wats. Proc. Am. Acad 17: 339. 1882.
Evsenhardtia amorphoides orthocarpa A. Grav, PI. Wright. 2: 37. 1853. V'iborquia orthocarpa Cockerell, Bull. Am. Mus. Nat. Hist. 24: 97. 1908.
A much branched shrub or small tree, 3-5 m. high; stems grayish-brown, the young growth canescent with whitish ascending incurved hairs; leaves 5-15 cm. long, spreading; stipules 2-3 mm. long, subulate; stipels bristle-like, from a broad base, reddish, less than 1 mm. long, shorter than the petiolules, soon deciduous; leaflets 21-41, oblong, 10-20 mm. long, dullgreen above, paler beneath, pubescent on both surfaces, especially beneath, punctate beneath with minute dark dots, faintly reticulate above, membranous; racemes 5-10 cm. long; bracts 1-2 mm. long, lanceolate, brown, pubescent, deciduous much before anthesis; calyx-tube 2—3 mm. long, glandular-dotted, finely pubescent, ridged, split slightly more deeply on the posterior side; lobes 0.4-0.8 mm. long, acute, nearly uniformly pubescent; petals 5-7 mm. long, membranous, more than twice as long as the calyx, the standard broad, notched ; style 4—5 mm. long, slightly pubescent, slightly upcurved at the apex, the gland at the curve large, conspicuous; pods 10-13 mm. long, 2.5-3 mm. wide, thin, greenish-brown, glabrous, slightly upcurved at the apex, inconspicuously punctate distally with small glands, at maturity reflexed-spreading, on pedicels about 1 mm. long; seed filling two fifths to one half the length of the pod, 4.8-5.3 mm. long, oblanceolate, flat, smooth, olive-brown, with a narrow basal lobe.
Type locality: Mountains at Guadalupe Pass, near San Bernardino, Sonora. Distribution: Rocky canons, in the mountains of southeastern Arizona, Sonora, and Chihuahua, at elevations of 1350-1750 meters.

Perennial, Trees, Shrubs, Woody throughout, Stems woody below, or from woody crown or caudex, Nodules present, Stems erect or ascending, Stems 1-2 m tall, Stems greater than 2 m tall, Plants gland-dotted or with glan d-tipped hairs, Stems solid, Stems or young twigs sparsely to densely hairy, Stems silvery, canescent, tomentose, cobwebby, or wooly, Leaves alternate, Leaves petiolate, Stipules inconspicuous, absent, or caducous, Stipules setiform, subulate or acicular, Stipules deciduous, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Stipels present at base of leaflets, Leaflets 10-many, Leaves hairy on one or both surfaces, Inflorescences spikes or spike-like, Inflorescence axillary, Inflorescence terminal, Bracts very small, absent or caducous, Bracteoles present, Flowers sessile or nearly so, Flowers zygomorphic, Calyx 5-lobed, Calyx gland-dotted or with glandular spot, Calyx hairy, Petals separate, Petals clawed, Petals white, Banner petal narrow or oblanceolate, Wing petals narrow, oblanceolate to oblong, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style ter ete, Style hairy, Fruit a legume, Fruit unilocular, Fruit indehiscent, Fruit oblong or ellipsoidal, Fruit exserted from calyx, Fruit glabrous or glabrate, Fruit gland-dotted or with gland-tipped hairs, Fruit 1-seeded, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.

Eysenhardtia orthocarpa is a species of small flowering tree, (a kidneywood) in the family Fabaceae. Its range is at the northern region of the Sierra Madre Occidental cordillera of eastern Sonora; it is also in central Sonora, with the species ranging into southeast Arizona and the extreme southwest, bootheel region of New Mexico, the entire sky island region at the northern cordillera called Madrean Sky Islands.

Eysenhardtia orthocarpa là một loài thực vật có hoa trong họ Đậu. Loài này được (A.Gray) S.Watson miêu tả khoa học đầu tiên.