242 Engelmann and Gray, 



230. Astragalus caryocarpus, Ker. Prairies west of San 

 Felipe. April. 



231. Lupinus subcarnosi's, Hook. Prairies. April. Plant 

 5 to 15 inches high, branching from the base, with rather 

 smaller and paler flowers and more silky or woolly inflo- 

 rescence than the nearly related L. Texensis, — of which a 

 few specimens were intermixed in the collection. 



232. Cassia Chamxcrista, var. cinerea, Torr. fy Gr. 

 Sandy places in woods along the Colorado. August. The 

 leaves bear setaceous glands between the 4 to 6 lower pairs 

 of leaflets ; the gland below the lowest pair is stipitate ; and 

 the 5 alternate anthers are shorter. 



233. Algarobia glandulosa, Torr. fy Gr. Fl. I. p. 399. 

 " This shrub, or small tree, about 10 feet high, with a stem 

 6—8 inches in diameter, either grows sparsely or forms thickets 

 in the low prairies. It is called musket-tree by the Texans. 

 It is first found as a low shrub on the San Bernardo prairie, 

 west of San Felipe, but becomes larger and more frequent 

 westwardly, giving a new character to the vegetation, as in the 

 musket-thickets on the Colorado, along the borders of which 

 several Cacti, hereafter enumerated, are abundantly met with. 

 It ripens its pods at the end of August." Lindheimer. — The 

 leaflets vary, often on the same specimen, from narrow linear 

 to oblong, and even broadly elliptical. Lindheimer's speci- 

 mens are some of them in fine fruit, showing that the species 

 is totally distinct from A. dulcis, (of which Bentham con- 

 jectured it might perhaps be a variety,) and also presenting 

 some peculiarities that call for more particular remark. The 

 mature legumes are from 5 to 7 inches long, raised on a stipe 

 which is often an inch in length : they are narrowly linear, 

 more or less curved or falcate, very slightly compressed, 

 strongly torose, and from 9 to 20-seeded : the epicarp is char- 

 taceo-membranaceous, and contains a considerable quantity of 

 sweet farinaceous pulp which surrounds the seeds, or rather 

 the coriaceous investment in Which the seeds are singly con- 

 tained. For each seed is enclosed in a distinct and almost 



