FABACEAE. 197 



2. THERMOPSIS R. Br. 

 Pods erect or ascending. 



Pods straight. 



Pods strictly erect and appressed, densely pubescent ; stipules narrow. 



1. T. montana. 

 Pods ascending-erect, sparingly pubescent ; stipules broad. 



;«. T. pinetorum. 



Pods arcuate, with spreading tips. 3. T. divaricarpa. 



Pods strongly divaricate or reflexed, curved. 



Pods mostly horizontal, arcuate. 4. T. arenosa. 



Pods reflexed, curved in a half-circle or more. 5. T. rhombifolia. 



1. Thermopsis montana Nutt. (T. stricta Greene) In meadows from 

 Mont, and Wash, to Colo., Utah and Ore. — ^Alt. 5000-9000 ft. — Hounold; 

 Larimer Co.; Grayback mining camps and Placer Gulch; along Conejos 

 River, north of Antonito; Sapinero; Gunnison. 



2. Thermopsis pinetorum Greene. In open woodlands and on hillsides in 

 Colo, and N. M.— Alt. 5000-9000 ft. — Chicken Creek, West La Plata Moun- 

 tains; East Indian Creek; Los Pinos (Bayfield); Grayback mining camps 

 and Placer Gi^lch; Table Rock; foot of Horsetooth Mountain; Rist Caiion; 

 Boulder ; Colorado Springs ; Marshall Pass. 



3. Thermopsis divaricarpa A. Nels. In valleys and on foot-hills in Wyo. 

 and Colo. — Alt. 5000-11,000 ft. — Denver; Cucharas Valley, near La Veta; 

 Veta Mountain; Ute Pass; Sangre de Cristo Creek; mountain near Veta 

 Pass; Ft. Collins; Howe's Gulch; Beaver Creek; Horsetooth Mountain; 

 Cache la Poudre; foot-hills near Boulder; Eldora to Baltimore; Rist Canon; 

 Anita Peak. 



4. Thermopsis arenosa A. Nels. In sandy soil from Sask. and Mont, to 

 Colo. — Alt. 8000-10,000 ft. — Empire; Eldora to Baltimore. 



5. Thermopsis rhombifolia (Nutt.) Richardson. In sandy soil from Sask. 

 and Mont, to Colo. — Alt. 4000-8000 ft. — Manitou; butte five miles southwest 

 of La Veta; mesas near Colorado Springs; Black's Lake; west of Soldier 

 Caiion; north of La Porte; north of Ft. Collins; Trinidad. 



3. LUPINUS L. Lupine. 



A. Perennials ; cotyledons petioled after germination. 

 I. Stems tall, 3 dm. or more, scarcely cespitose. 

 I. Leaves glabrous above, at least in age. 



Stem pubescent with long and spreading hairs or glabrous. 



Banner not with a dark spot ; leaflets of the basal leaves oblanceolate, 



acute. 1. L. amplus. 



Banner with a dark spot ; leaflets of the basal leaves spatulate, obtuse, 

 mucronate. 2. L. ammophilus. 



Stem appressed-pubescent, at least above. 



Flowers large, over 12 mm. long; banner with a dark spot. 



3. L. plattensis. 

 Flowers small or middle-sized, 12 mm. or less long; banner not with a 



dark spot. 

 Plant green ; stem and lower surface of the leaves sparingly appressed- 

 pubescent. 



Flowers middle-sized, 8-12 mm. long. 



Plant purplish ; calyx strongly gibbous at the base. 



4. L. rubricaulis. 

 Plant green ; calyx not strongly gibbous. J. L. alpestris. 



Flowers very small, 6-8 mm. long. 



