LEGUMINOS&. SILVA OF NORTH AMERICA. 29 
EYSENHARDTIA. 
FLOWERS in dense spicate racemes; calyx 5-toothed; petals erect, free; ovary 
subsessile, 2 to 3 or rarely 4-ovuled. Legume small, compressed; seeds oblong-reniform, 
solitary or rarely 2. Leaves unequally pinnate. 
Kysenhardtia, Humboldt, Bonpland & Kunth, Nov. Gen. Viborquia, Ortega, Dec. v. 66 (not Thunberg nor Moench). 
et Spec. vi. 489. — Meisner, Gen. 89.— Endlicher, Gen. Varennea, De Candolle, Mém. Légum. 494. 
1270. — Bentham & Hooker, Gen. i. 492.— Baillon, 
Hist. Pl. ii. 287. 
Small glandular-punctate trees or shrubs, with slender terete branches. Leaves alternate, unequally 
pinnate; stipules subulate, caducous; leaflets oblong, mucronate or emarginate at the apex, short- 
petiolulate, numerous, stipelate. Flowers short-pedicellate, in long spicate racemes, terminal or produced 
from the axils of the upper leaves. Bracts subulate, caducous. Calyx tubular-campanulate, conspicu- 
ously glandular-punctate, five-toothed, the acute teeth nearly equal, persistent. Disk cupuliform, adnate 
to the base of the calyx-tube. Corolla subpapilionaceous ; petals erect, free, nearly equal, oblong- 
spatulate, rounded at the apex, unguiculate, creamy white; the standard concave, slightly broader 
than the wings and keel. Stamens ten, inserted with the petals, diadelphous, the superior one free, 
shorter than the others, the remainder united above the middle into a tube; anthers uniform, oblong, 
attached on the back at the middle, two-celled, the cells opening longitudinally. Ovary subsessile, 
contracted into a long slender uncinate style, geniculate and conspicuously glandular below the apex ; 
stigma introrse, oblique; ovules two or three, rarely four, attached to the interior angle of the ovary, 
superposed, descending, amphitropous. Legume small, oblong or linear-falcate, compressed, tipped with 
the remnants of the style, indehiscent, pendent or erect. Seed usually solitary, rarely two, oblong- 
reniform, destitute of albumen ; testa coriaceous. Embryo filling the cavity of the seed; cotyledons 
flat, fleshy ; radicle superior, short and erect. 
Eysenhardtia belongs to the warmer parts of the New World, where it is found in the region from 
western Texas and Arizona to southern Mexico, Lower California, and Guatemala. Four species are 
distinguished. The type of the genus, Hysenhardtia polystachya,' a slender shrub, is widely distributed 
through western Texas south of the Colorado River and is common in the Mexican Sierra Madre. 
Eysenhardtia spinosa,’ a low intricately branched shrub, occurs on the mountain ranges of Chihuahua 
and in Lower California, and Hysenhardtia orthocarpa, sometimes a small tree, on those of western 
Texas, New Mexico, Arizona, and northern Mexico. Kysenhardtia adenostylis,’ the most southern 
species of the genus yet discovered, is known only in Guatemala. 
1 Eysenhardtia polystachya. Varennea polystachya, De Candolle, l. c. 522. 
Viborquia polystachya, Ortega, Dec. v. 66, t. 9. 2 Engelmann, Jour. Bost. Soc. Nat. Hist. vi. 174 (Pl. Lindheim. 
E. amorphoides, Humboldt, Bonpland & Kunth, Nov. Gen. et  ii.). — Hemsley, J. c. — Brandegee, Proc. Cal. Acad. ser. 2, ii. 148 
Spec. vi. 491, t. 592. — De Candolle, Prodr. ii. 257.—Gray, Jour. (Pl. Baja Cal.). 
Bost. Soc. Nat. Hist. vi. 173 (Pl. Lindheim. ii.). — Hemsley, Bot. 8 Baillon, Adansonia, ix. 239. 
Biol. Am. Cent. i. 236.— Watson, Proc. Am. Acad. xvii. 339. — 
Coulter, Contrib. U. S. Nat. Herb. ii. 76 (Man. Pl. W. Texas). 
