10 Flora of Denver. 



It can easily be distinguished from T. rhombifolia by the 

 strictly upright pods. 



62. Sophora sericea NUTT. Flowers white, pods com- 

 pressed between the seeds. Common. Summer. 



' ^63. Lupinusargenteus PURSH. (SILVERY LUPINE.) Peren- 

 nial, diffusely branching, leafy, silky canescent, blue flowers in 

 a somewhat thick raceme. Common. Summer. 



64. Lupinus pusillus PURSH. (HAIRY LUPINE.) Annual, 

 low, racemes short and dense, pod hairy and 2-seeded. In 

 sandy places, North Denver and near Cherry Creek. Rather 

 common'. Spring. 



65. Trifolium pratense L (RED CLOVER.) Introduced. 



66. Trifolium repens L. (WHITE CLOVER.) Introduced. 



67. Trifolium hybridum L. (ALSIKE OR SWEDISH CLOVER.) 

 Introduced sparingly. 



68. Melilotusofficinalis WILLD. (YELLOW SWEET-CLOVER.) 

 Introduced, rare. 



69 Melilotus alba LAM. (SWEET-CLOVER.) Introduced, 

 very common along the ditches. 



70. Medicago sativa L. (ALFALFA, LUCERNE.) Intro- 

 duced, common. 



71. Psoralea tenuiflora PURSH. Diffusely branching, flow- 

 ers blue, rarely white; pod one-seeded, glandular. Summer and 

 fall. Common on the plains. 



72. Psoralea lanceolata PURSH. Erect, branching from 

 the base, flowers white, pod very glandular. Along the 

 Platte. Summer. 



73. Dalea alopecuroides WILLD. Flowers blue or white, 

 small in dense spikes. South Denver on Lincoln Avenue. 

 Along a ditch near the south side of Cherry Creek. Fall. 



