LB6UMIN08A 271 



2. Trifolium plumosum, Dougl. in Hook. 



Hab. High plains in the Flat Head country, Rev. Mr. Spalding. — 

 A tall and stout species, with large heads of white flowers. It seems 

 to be confined in its range, having never been received by us in any 

 other collection. 



3. Trifolium longipes, Mitt, in Torr. & Gray. 



Hab. Prairies in the interior of Oregon and Washington Terri- 

 tory. — Plant 8 to 12 inches high. Leaflets varying from elliptical to 

 linear-lanceolate, an inch or more in length, in the dried specimens 

 strongly veined. Teeth of the calyx filiform-subulate, the three 

 lower twice as long as the tube. Corolla whitish or ochroleucous. 



4. Trifolium megacephalum, Nuit. 



Hab. High and dry prairies of the Upper Columbia. — The speci- 

 mens differ from the original Lupinaster megacephalus of Pursh in the 

 nearly smooth stem and leaves. The legume, moreover, is sessile, 

 and contains only one or two seeds. 



5. Trifolium microcephalum, Pursh. 



Hab. Oregon and Washington Territory : common from the Pacific 

 to the Kooskooskee. — Stems slender, branching, erect or decumbent, 

 from three inches to a foot or more in length. 



6. Trifolium tridentatum, Lincll. 



Hab. Puget Sound, and Valley of the Sacramento, California. — 

 This is the T. involucratum of Torrey and Gray's Flora, but not of 

 Willdenow, which is a Mexican plant. 



