to the Rocky Mountains. 17T 



sparingly glandular, with minute subulate stipules at the base ; leaflets S 

 pairs with a terminal one, lanceolate-oblong, very smooth, mucronate, en- 

 tire, slightly punctate beneath. Spikes 1-3 on each plant, terminal, on 

 long naked peduncles, linear, dense, the central one about 6 inches in 

 length and not half an inch in diameter. Richis retrorsely villous. Bracts 

 lanceolate, silky, as long as the calyx. Flowers small, white, sessile. Ca- 

 lyx 5-cleft, covered with silky hairs ; segments acute. Petals with long 

 claws ; limb oblong. Stamens 5, united below. Gerrnen villous, acumi- 

 nate with the style. Legume enclosed in the persistent calyx, gibbous, 

 compressed, hairy. Seed solitary, orbicular- reniform, compressed, brown, 

 shining. 



Hab. About the Forks of the Platte, with the three fol- 

 lowing species. 



Obs. The long dense spikes of this species are very re- 

 markable. The upper surface of the leaves turns to a deep 

 bright green colour in the dried plant. 



80. P. candidum, Michx. fl. ii. p. 48. t. 37. f. 1. DC. 

 prod. ii. p. 243. 



81. P. villosum, Nutt. gen. ii. p. 84. Torrey in Sill, 

 jour. iv. p. 66. DC. prod. ii. p. 243. 



Obs. This species has an extensive range, in both latitude 

 and longitude. Mr. Nuttall found it on the Missouri as high 

 as Fort Mandan, and Captain Douglass collected it in Cass's 

 expedition. 



82. P. violaceum, Michx. 1. c. t. 37. f. 2. DC. prod. ii. 

 p. 243. 



83. Dalea. 7t. sp. On the Platte. A beautiful species, 

 with scarlet flowers ; found also by Mr. Nuttall in the Ar- 

 kansa country. 



84. D. aurea, Nutt. gen. ii. p. 101. Pursh fl. ii. p. 140. 

 DC. prod. ii. p. 244. 



85. D. laxiflora, Pursh fl. ii. p. 741. Nutt. gen. ii. p. 

 101. DC. prod. ii. p. 244. 



86. D. Formosa, suffruticosa, ramosissima, glabra; foliolis 

 sub 5-jugis, cuneato-oblongis, retusis, subtusnigro-punctatis ; 



