FABACEAE. 215 



7. Parosela spinosa (A. Gray) Vail. (Dalea spinosa A. Gray) In arid 

 places from Colo, to Calif, and Ariz. ; also Mex. — ■" Colorado " ; exact locality 

 not given. 



8. Parosela Dalea (L.) Britten. {Dalea alopecuroides Willd.) Prairies 

 from III. and Minn, to Tex. and Mex. — Denver {Eastwood). 



32. PETALOSTEMON Lam. Prairie Clover. 



Calyx glabrous; corolla white. i. P. oligophyllus. 



Calyx pubescent. 



Corolla white or yellow ; spike long and compact. ■^. P. compactus: 



Corolla rose or purple, very rarely white. 

 Leaflets usually 5. 



Stem and leaves glabrous or sparingly hairy. 3. P. purpureus. 



Stem rather densely short-hairy. 4. P. pubescens. 



Leaflets 7-17, oblong. 5. P. villosus. 



1. Petalostemon oligophyllus (Torr.) Rydb. {P. graciles oligophyllus 

 Torr.) On plains from Ass. to Iowa, Colo, and Ariz. — Alt. 4000-7000 ft. — 

 Ft. Collins; east of Colorado Springs; Caiion City; New Windsor, Weld Co.; 

 Cucharas Valley, near La Veta; Pueblo; Poudre River; Arkansas River; 

 Fossil Creek; Dixon Canon; Boulder. 



2. Petalostemon compactus (Spreng.) Sweezy. {Dalea compacta Spreng. ; 

 P. macrostachyus Torr.) On dry plains from Neb. to Wyo. and Colo. — 

 Alt. 4000-5000 ft. — Denver ; New Windsor, Weld Co. ; near Timnath ; Ft. 

 Collins. 



3. Petalostemon purpureus (Vent.) Rydb. {P.violaceusMichx.) On plains 

 and prairies from Ind., Sask. and Alb. to Mo. and N. M. — Alt. 4000-7000 

 ft. — Colorado Springs ; Boulder ; La Porte, Larimer Co. ; Sterling, Logan 

 Co. ; Cucharas Valley, near La Veta ; Denver ; Ft. Collins ; Spring Canon ; 

 Horsetooth Gulch; Boulder. 



4. Petalostemon pubescens A. Nelson. Plains of Colo. — Berwind. 



5. Petalostemon villosum Nutt. In sandy soil from Sask. and Mont, to 

 Mo. and Colo. — Alt. 4000-5000 ft. — Sterling, Logan Co. 



33. HEDYSARUM L. 



Calyx-teeth shorter than the tube ; reticulations of the pod polygonal. 



1. H. marginatum. 

 Calyx-teeth longer than the tube ; reticulations of the pods transversely elongated, 



usually reaching from the middle to the margins, without cross-veins. 

 Leaflets elliptic-oblong, not fleshy; flowers 12-15 mm. long, purple; bracts lan- 

 ceolate-subulate, 3-5 mm. long; internodes of the fruit 3-5. 



2. H. pabulare. 

 Leaflets linear-oblong, somewhat fleshy ; flowers about 1 mm. long, rose-purple ; 



bracts lanceolate, 1.5-2 mm. long; internodes of the fruit 1-3. 



3. H. carnosulum. 



1. Hedysarum marginatum Greene. {H. uintahense A. Nels.) On wooded 

 hillsides of Wyo. and Colo. — Alt. up to 9000 ft. — Near La Plata Post Office; 

 Pagosa Springs; Hesperus. 



2. Hedysarum pabulare A. Nelson. {H. Bakeri Greene) On hills of 

 Colo, and N. M. — Alt. 6000-7000 ft. — Mancos; Cimarron; Canon City, Fre- 

 mont Co. ; Dolores ; Palisades. 



