CONTRIBUTIONS TO WESTERN BOTANY. 63 1 



No. 5176]". May 5, Silver Reef, Utah, 3500° alt., in 

 gravel. 



Allied to L. brevicaiiJis; annual, 2—6' high, branching 

 from the base and lateral stems decumbent: whole plant 

 even to the calyx and pods sparsely long- and silky-villous, 

 or in some cases quite densely so, the hairs always spread- 

 ing and soft; petioles usually 3 to 4 times the leaflets; 

 leaflets spatulate, 8" long or less, and about 2^" wide, 

 rounded, often apiculate, about 8, not reduced above; 

 whole plant very leafy; flowers 3^" long, in short, spike- 

 like racemes, reddish-purple, subtended by short, trian- 

 gular bracts; calyx lobes lanceolate, 1^-2" long and the 

 calyx cleft nearly to the base, banner oval and shorter 

 than the keel; keel i/^" wide; pods narrowly-oblong, 

 about 8" long, lyi" wide, deeply cross-wrinkled between 

 the seeds; seeds 3-4, nearly square, about i/^" wide. 

 This differs from L. hrevicaiilis in the narrow pods, much 

 larger flowers, in racemes instead of heads, and the 

 caulescent stems. It seems to be intermediate between 

 L. brevicaidis and L. Arizonicus. Having gathered it in 

 very many localities and finding that its characters remain 

 constant I do not hesitate to separate it as a good species. 



This grows in the Larrea belt in red sand and on grav- 

 elly slopes. 



Petalostenion Jiavescens Watson seems to be a white 

 flowered form of P. Sear I sice. I can see no other valid 

 difference. 

 Psoralea castor ea Watson. 



No. 5024J. April 5, 1894, Beaverdam, Arizona, 1800° 

 alt., in drifting sand. 



This plant is found only within the Larrea belt on drift- 

 ing sand dunes, growing singly, from a deep seated, erect, 

 nearly spherical root which is fleshy and with only scat- 

 tered woody fibers within ; the root is 2' or more in diam- 

 eter. 



