214 FABACEAE. 



Plants with long scattered hairs, not cinereous ; leaflets linear to obovate. 



4. P. hypogaea. 

 Plant cinereous, with short appressed pubescence ; leaflets broadly obovate or 

 rounded-spatulate. 5. P. mephitica. 



1. Psoralea lanceolata Pursh. In sandy soil from Sask. to Colo, and Ariz. 

 — Alt. 4000-7000 ft. — Colorado Springs; Wray; Manitou Junction; La Veta. 



2. Psoralea tenuiflora Pursh. On dry plains and hills from S. D. and 

 Mont, to Ark. and Ariz. — Alt. 4000-8000 ft. — Golden; Cucharas Valley, near 

 La Veta; Cation City; New Windsor, Weld Co.; Eads; Crow Creek; Chey- 

 enne Canon ; Colorado Springs ; Ft. Collins ; plains and foot-hills near 

 Boulder. 



3. Psoralea argophylla Pursh. On plains and prairies from Wis. and 

 Sask. to Mo. and N. M. — Denver. 



4. Psoralea hypogea Nutt. On dry plains from Neb. and Colo, to Tex. 

 and N. M. — Alt. 4000-6000 ft. — Denver; Colorado Springs. 



5. Psoralea mephitica S. Wats. In arid soil from Colo, to N. M. and 

 Calif. — Grand Junction. 



31. PAROSELA Car. 



Perennials. 



Stem and leaves perfectly glabrous. 



Stem herbaceous ; bracts obovate, persistent, enclosing the calyx. 



1. P. lasianthera. 

 Stem low, suffruticose, branched ; spikes 2-6 flowered ; bracts ovate, deciduous. 



2. P. formosa. 

 Stem and leaves more or less hairy. 



Spike dense, crowded ; petals yellow, at least at first ; plant herbaceous. 

 Leaves digitately tri-foliolate ; plant low and cespitose. 3. P. Jamesii. 

 Leaves pinnately 3-7-foliolate. 



Leaflets of the stem-leaves at least only 3 ; petals turning purplish ; spike 



in fruit about 10 mm. thick. 4. P. elatior. 



Leaflets 5-7 ; petals not turning purple ; spike in fruit about 15 mm. thick. 



5. P. aurea. 

 Spike lax ; petals purple. 



Leaves pinnately 3—13 foliolate ; stem scarcely spinose. 6. P, lanata. 

 Leaves uni-foliolate or none ; plant very spiny. 7. P. spinosa. 



Annual ; leaves glabrous. 8. P. Dalea. 



1. Parosela lasianthera (A. Gray) Heller. {Dalea lasianthera A. Gray) 

 In dry soil from Colo, to Tex. and N. M. — Reported from Colorado, but 

 doubtful. 



2. Parosela formosa (Torr.) Vail. {Dalea formosa Torr.) In dry soil 

 from Colo, and Utah to Tex. and Ariz. — Platte River. 



3. Parosela Jamesii (T. & G.) Vail. {Dalea Jamesii T. & G. ; Parosela 

 Porteri A. Nels.) In dry soil from Colo, to Tex. and N. M. — Alt. 4000- 

 6000 ft. — Rocky Ford, Otero Co. ; Walsenburg ; Cation City ; Florence. 



4. Parosela elatior (A. Gray) Vail. {Dalea nana elatior A. Gray; D. 

 rubescens S. Wats.) Dry places from Colo, to Tex. — " Southeastern Colo- 

 rado." 



5. Parosela aurea (Nutt.) Britton. {Dalea aurea Nutt.) On plains from 

 S. D. to Texas. — "Northeastern Colorado." 



6. Parosela lanata (Spreng.) Britton. {Dalea lanata Spreng.) In dry soil 

 from Kans. and Utah to Tex. and Ariz. ; also in Mex. — On the Platte. 



