200 FABACEAE. 



18. Lupinus dichrous Greene. In the mountains of Colo. Alt. about 7000 

 ft. Cedar Edge. 



19. Lupinus psoralioides Pollard. Open gravelly soil in Colo. Gunnison. 



20. Lupinus caespitosus Nutt. On hillsides from Mont, to Colo, and 

 Utah. Alt. about 8000 ft. Hinsdale Co.; North Park, near Teller; twelve 

 miles below Grand Lake ; Gunnison ; Kremmling. 



21. Lupinus Watsoni Heller. (Lupinus aridus Utahensis S. Wats.) In 

 sandy soil from Ida. to Colo, and Utah. North Park ; Gunnison. 



22. Lupinus brevicaulis S. Wats. On hills from Colo, and Utah to N. M. 

 and Ariz. Alt. 5000-6000 ft. Arboles ; Hotchkiss, Delta Co. 



23. Lupinus Kingii S. Wats. (L. Sileri S. Wats.) In dry soil from Utah 

 and Colo, to Ariz. Alt. 4000-8000 ft. Mancos ; Garland ; Piedra ; Thomp- 

 son's Park, La Plata Mountains ; Gunnison. 



24. Lupinus pusillus Pursh. On dry plains from Mont, and Ore. to Kans., 

 N. M. and Utah. Alt. 1500-1600 m. Mesas near Pueblo ; New Windsor ; 

 Crow Creek; La Porte, Larimer Co.; Wray; Hotchkiss; Lamar; Rocky 

 Ford; Ft. Collins; Walsenburg. 



4 . TRIFOLIUM L. CLOVER. 



Heads not involucrate. 



Plants mostly tall ; stem leafy. 

 Calyx hairy. 



Heads sessile ; corolla red-purple ; free portion of the stipules ovate. 



i. T. pratense. 

 Heads long-peduncled ; corolla white or pink ; free portion of the stipules 



elongated-lanceolate. 



Plants cespitose from a woody root ; stems ascending ; corolla salmon- 

 color. 2. T. Rusbyi. 

 Plant erect from a creeping rootstock ; corolla white. 



3. T. Rydbergii. 

 Calyx glabrous ; peduncles axillary ; corolla white or rose-color. 



4. T. repens. 

 Plants low, cespitose ; stems scapiform. 



Calyx glabrous. 



Heads i-3-flowered : flowers not reflexed ; calyx-teeth lanceolate ; caudex 



thick, densely cespitose with short branches. 5. T. nanum. 



Heads several-flowered ; flowers reflexed ; calyx-teeth subulate ; branches of 



the caudex more slender and elongated. 6. T. Brandegei. 



Calyx pubescent. 



Leaflets oval or obovate, strongly veined and sharply dentate. 



Flowers 10-12 mm. long. 7. T. subacaulescens. 



Flowers about 8 mm. long. 8. T. gymnocarpon. 



Leaflets lanceolate or linear-lanceolate, entire and not strongly veined. 

 Flowers reflexed in fruit ; bracts minute, truncate and toothed. 



Calyx Yz~y^ as long as the corolla ; its teeth fully twice as long as the 



tube. 9. T. stenolobitin. 



Calyx about half as long as the corolla ; its teeth only slightly longer 



than the tube. 



Banner acuminate; leaflets linear-lanceolate. 10. T. attenuation. 

 Banner obtuse, minutely mucronate ; leaflets oblong-lanceolate to 



elliptic. ii. T. bracteolatiiin. 



Flowers not reflexed in fruit ; bracts more conspicuous, lanceolate to 



subulate, long-attenuate. 



Bracts narrowly linear-lanceolate or subulate, much exceeding the 

 calyx-tube and often almost equalling the calyx-teeth ; plant bright 

 green. 12. T. lividum. 



