356 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
6. Petalostemum tenuifolium A. Gray, Proc. Amer. Acad. 11: 73. 1876. 
Type Locatity: ‘‘Arkansas, at the crossing of Red River.”’ 
Range: Kansas and Arkansas to New Mexico. 
New Mexico: Las Vegas; Raton Mountains; Causey; Algodones; Sandia Mountains; 
Buchanan; Sierra Grande. Plains and low hills, in the Upper Sonoran and Transition 
zones. 
17. PETERIA A. Gray. 
Low herbaceous perennial with smooth glaucous junciform stems and pinnate many- 
foliolate leaves; stipules small, spiny; leaflets very small, acute, deciduous from the 
rachis; flowers rather large, pale greenish, tinged with pink, widely scattered on long 
peduncles; pods linear, pendulous, 5 cm. long or more. 
1. Peteria scoparia A. Gray, Pl. Wright. 1: 50. 1852. 
Tyre Locauiry: Mountain valleys beyond the pass of the Limpio, Texas. 
Rance: Western Texas and adjacent Mexico. 
New Mexico: Telegraph Mountains; Tortugas Mountain. Dry hills, in the Lower 
and Upper Sonoran zones. 
Coulter states ' that the plant has a small edible tuberous rootstock and is known 
in western Texas as ‘‘camote de monte.’’ 
18. ROBINIA L. Locust. 
Spiny shrubs or small trees with odd-pinnate leaves, rather large pink flowers in 
crowded axillary short-peduncled racemes, and flat pods 6 to 12 cm. long, with prom- 
inent sutures and numerous seeds; leaflets 1 to 2 cm. long, oblong-elliptic to oval. 
KEY TO THE SPECIES. 
Fruit and peduncles densely glandular-hispid.-...... Lecce eeeeee 1. R. neomexicana. 
Fruit glabrous; peduncles not hispid, merely glandular-pubescent 
or puberulent, the glands few and small... .............. 2. R. rusbyt. 
Robinia pseudacacia 1., the black locust, a tree with white flowers, is often planted 
asa shade tree. It seems to do better than almost any other introduced shade tree in 
the drier portions of the State. 
1. Robinia neomexicana A. Gray, Mem. Amer. Acad. n. ser. 5: 314. 1854. 
New MEXIcAN Locust. 
Tyre Locauity: Dry hills on the Mimbres, New Mexico. Type collected in May, 
1851, by Thurber. 
RanGeE: Colorado to Arizona and western Texas. 
New Mexico: Raton; Sandia Mountains; Cross L Ranch; Magdalena Mountains, 
Mangas Springs; Burro Mountains; Black Range; Fort Bayard; Organ Mountains; 
White and Sacramento mountains. Transition Zone. 
2. Robinia rusbyi Woot. & Standl. Contr. U. 8. Nat. Herb. 16: 140. 1913. 
Type Locatiry: On the Mogollon road 15 miles east of Mogollon, New Mexico. Type 
collected by Wooton, August 8, 1900. 
Ranae: Mountains of southern New Mexico. 
New Mexico: Mogollon Mountains; Burro Mountains; Mescalero Reservation. 
Transition Zone. 
. 19. ASTRAGALUS L. 
Herbaceous perennials, rarely annuals; leaves odd-pinnate; flowers racemose, 
sometimes pseudocapitate, whitish, yellow, or purple; stipules either free, adnate to 
the base of the petiole or connate opposite the petioles forming a partial sheath; calyx 
Contr. U. 8. Nat. Herb. 2: 81, 1891. 
