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.) Britton. (Dalea alopecuroides Willd.) Prairies 

 from 111. 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. 2. P. compactus. 



Corolla rose or purple, very rarely white. 

 Leaflets usually 5. 



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



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



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



1. Petalostemon oligophyllus (Torn) Rydb. (P. graciles oligophyllus 

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

 Ft. Collins; east of Colorado Springs; Canon 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. violaccus Michx.) 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. marginatnin. 

 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 10 mm. long, rose-purple; 



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



3. H. carnosulwn. 



1. Hedysarum marginatum Greene. (H. uintahcnsc 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. Bakcri Greene) On hills of 

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

 mont Co. ; Dolores ; Palisades. 



