New Mexico Locust

Robinia rusbyi Wooton & Standley, Contr U. S. Nat. Herb. 16: 140. 1913.
A shrub; branches puberulent when young, soon glabrous, red or brown; stipular spines stout, straight, 5-15 cm. long; leaves about 15 cm. long; rachis slender, minutely puberulent or glabrate, sulcate above; leaflets 11-17, oval or broadly oblong, rounded at both ends and mucronate at the apex, minutely strigillose on both sides, 2-4 cm. long, 1.5-3.5 cm. wide; racemes dense, 1 dm. long or less; peduncle, pedicels, and calyces hirsutulous and somewhat glandular-hispid; calyx-tube 6 mm. long, the lobes lanceolate, acuminate, 6 mm. long; corolla about 2 cm. long, rose-purple; pod 5-8 cm. long, 14-18 mm. wide, glabrous, abruptly acute, 4-8-seeded.
Type locality: Fifteen miles east of Mogollon, New Mexico. Distribution: Mogollon Mountains, New Mexico.

Robinia neomexicana A. Gray, Mem. Am. Acad 11.5:314. 1854.
Robinia Rusbyi Wooton & Standley, Contr. U. S. Nat. Herb. 16: 140, in part. 1913.
A shrub, 1-2 m. high; branches grayish-puberulent, in age reddish or purplish; stipular spines mostly straight, 2-10 mm. long, puberulent; leaves 1-1.5 dm. long; rachis puberulent, sulcate above; leaflets 9-15, elliptic-lanceolate, mostly acutish at each end, 1-3 cm. long, 5-15 mm. wide, bluish-green, rather firm, strigulose on both sides; stipels subulate, 1-1.5 mm. long; racemes about 1 dm. long, the peduncle, pedicels, and calyces puberulent and glandularhispid; pedicels about 5 mm. long; calyx-tube 7-7 mm. long, the lobes lanceolate, acuminate, 7-8 mm. long; corolla rose-colored, about 15 mm. long; pod 6-8 cm. long, 8 mm. wide, hirsutulous, but not glandular-hispid, gradually acute at each end, merely margined on the seedbearing suture, 4— 8-seeded.
Ty pe locality: Dry hills on the Mimbres, New Mexico. Distribution: Southwestern New Mexico.

Robinia subvelutina Rydberg, sp. nov
A shrub ; young branches canescent with short spreading hairs and more or less glandularhispid; stipular spines straight, 5-10 mm. long; leaves 1-2 dm. long; rachis subvelutinousvillous and the lower part and the petiole more or less glandular-hispid ; stipels subulate, 2-4 mm. long; leaflets oblong to oval, rounded at the base, rounded, obtuse, or acute, and mueronate at the apex, 2-5 cm. long, 1-2.5 cm. wide, softly short-villous on both sides, when young subvelutinous; racemes short and dense, about 7 cm. long; peduncle, pedicels, and calyces densely glandular-hispid; bracts ovate, acuminate; calyx-tube 5-7 mm. long, the lobes ovatelanceolate, 4-6 mm. long, short-acuminate; corolla pink, nearly 2 cm. long; pod glandularhispid, 6-S cm. long, 12-15 mm. wide, 3-6-seeded.
Tvpe collected on the Natanes Plateau, Bisbee, Arizona, June 26, 1912, Goodding 1092 (herb. N. Y. Bot. Gard.).
Distribution: Arizona and southwestern Utah.