LEGUMINOS^E 



at base, 1|' long, and 1' broad, coated at first on the lower surface and on the margins 

 with soft brown hairs, and silvery-pubescent on the upper surface, and at maturity thin, 

 pale blue-green, conspicuously reticulate-veined, and glabrous with the exception of the 

 slightly puberulous lower side of the slender midrib and stout petiolule; stipels mem- 

 branaceous, \' long, often recurved, sometimes persistent through the season. Flowers 

 appearing in May, 1' long, on slender pedicels \' in length and covered with stout glan- 

 dular hairs, in short compact many-flowered glandular-hispid long-stemmed racemes; 

 corolla pale rose color or sometimes almost white (f. albiflora Kusche), with a broad 

 standard and wing-petals. Fruit 3'-4' long, about %' wide, glandular-Lispid, with a nar- 

 row wing; seeds dark brown, slightly mottled, yV long. 



A tree, sometimes 20-25 high, with a trunk 6'-8' in diameter, and branchlets at first 

 pale and coated with rusty brown glandular hairs increasing in length during the summer, 

 and slightly puberulous, bright reddish brown, often covered with a glaucous bloom, and 

 marked by a few small scattered pale lenticels during their first whiter. Bark of the trunk 

 thin, slightly furrowed, light brown, the surface separating into small plate-like scales. 

 Wood heavy, exceedingly hard, strong, close-grained, yellow streaked with brown, with 

 light yellow sapw r ood of 4 or 5 layers of annual growth. 



Distribution. Banks of mountain streams; valley of the Purgatory River, Colorado, 

 through northern New Mexico and Arizona to southern Utah; on the Santa Catalina and 

 Santa Rita Mountains, southern Arizona up to altitudes of 7000; probably of its largest 

 size near Trinidad, Las Animas County, Colorado. 



Occasionally cultivated as an ornamental tree in the eastern states, and in western 

 Europe. 



X Robinia Holdtii Beiss, a hybrid of Robinia neo-mexicana var. luxurians and R. Pseu- 

 doacacia, has appeared in a Colorado nursery and is occasionally cultivated. 



3. Robinia viscosa Vent. Clammy Locust. 



Leaves 7'-12' long, with a stout nearly terete dark glandular-hispid clammy petiole, 

 and 13-21 leaflets; stipules subulate, chartaceous, often deciduous or developing into 

 short slender spines: leaflets ovate, sometimes acuminate, mucronate, rounded or pointed 



Fig. 571 



at apex, and cuneate at base, when they unfold covered below with soft white pubescence, 

 and slightly puberulous above, and at maturity dark green and glabrous on the upper sur- 

 face, pale and pubescent on the lower surface, especially on the slender yellow midrib and 

 primary veins and on the stout glandular-hispid petiolule, H'-2' long and f' wide; stipels 

 slender, deciduous. Flowers f ' long, almost inodorous, appearing in June, on slender 



