200 FABACEAE. 



i8. 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 Utahcnsis 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; Fiedra; 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. 



1. 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 1-3-flowered ; flowers not refie.xed ; calyx-teeth lanceolate ; caudex 



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



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. stibacaulescens. 



Flowers about 8 mm. long. 8. T. gyinnocarpon. 



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

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



Calyx Yi-yi as long as the corolla ; its teeth fully twice as long as the 



tube. 9. T. stenolobum. 



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

 than the tube. 

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

 Banner obtuse, minutely mucronate ; leaflets oblong-lanceolate to 

 elliptic. II. T. bracteolatum. 



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. 



