PAU. 7420, 
ROBINIA NEO-MEXICANA. 
Native of the Rocky Mountains. 
Nat. Ord. Legumtnos#.—Tribe GaLEGex. 
Genus Rosrnta, Linn. ; (Benth. & Hook. f. Gen. Plant. vol. i. p. 499.) 
ROBINIA neo-mexicana ; frutex y. arbuscula ramosa, ramulis hispidis, foliis 
6-12-pollicaribus, foliolis multijugis ellipticis obtnsis apiculatis primo 
supra albo-puberulis subtus tomentellis demum glaberrimis pallide viri- 
dibus, stipulis brevibus sericeis demum spinescentibus rectis v. recurvis, 
racemis breviter pedunculatis foliis brevioribus confertifloris, rhachi 
pedicellisque brevibus glanduloso-hispidis, bracteis lineari-oblongis cadu- 
cis, calycis tubo hispido dentibus subulato-lanceolatis glanduloso ciliatis, 
legumine 3-4-pollicari anguste alata glanduloso-hispida, valvis setis 
_ RB. neo-mexicana, A. Gray, Pi. Thurb. in Mem. Am. Acad. N. Se. vol. v. 
(1855) p. 314. Turez. in Pacif. Rail. Rep. vol. iv. p. 79; Bot. Mex. Bound. 
p. 53. 8..Wats. in King’s Rep. vol. v. p. 419. Porter, Fl. Colorad, p. 23. 
Coulter, Man. Bot. Rocky Mts. p.59. Rev. Hortic. 1895, p.112. Gartenfl. 
t. 1385. Sargent, Sylva of N. Amer. vol. iii. p. 48, t. 114. 
Robinia neo-mexicana marks the western limit of the 
genus, which reaches the eastern slopes of the Rocky 
Mountains, along the chain of which it extends from 
Southern Colorado to New Mexico, Southern Utah, and 
Arizona, at elevations of four thousand to seven thousand 
feet. It is very closely allied to, and is, indeed, the 
western representative of f. viscosa, Vent. Zard. Cels. t. 4 
(R. glutinosa, Sims. t. 560) a native of the mountains of 
Carolina; and which, according to Sargent, is one of the 
rarest trees of the United States. The only other species 
of the genus are the well-known Locust Tree, or False 
Acacia, f. Pseudacacia, Linn., and the Rose Acacia, &. 
hispida, L. (t. 811), both natives of the Eastern United 
States. I collected R. neo-mezxicana in fruit, when visiting 
the Rocky Mountains, in company with Dr. Gray, near the 
town of La Veta, in Colorado. The tree, from which the 
specimen figured was taken, has been in cultivation in 
the Kew Arboretum for the last twelve years, flowering 
in June. It was received from the Botanic Gardens of 
Harvard, U.S.A., in 1887. 
Juty Ist, 1900. 
