212 FABACEAE. 



2. Orophaca aretioides (Jones) Rydb. (Astragalus sericoleucus aretioides 

 Jones) On dry hills and plains of Wyo. and Colo. Alt. about 5000 ft. Ft. 

 Collins ; vicinity of Horsetooth ; plains near Denver. 



3. Orophaca sericea (Nutt.) Britton. (Phaca sericeus Nutt. ; A. sericoleu- 

 cus A. Gray) On plains and hills from Neb. to Wyo. and Colo. Julesburg. 



27. ARAGALLUS Necker. OXYTROPE, LOCO-WEED. 



Stipules adnate to the petioles only slightly at the base; pods pendant, i -celled, 



many times exceeding the calyx. i. A. deflexus. 



Stipules decidedly adnate to the petioles ; pods not pendant. 

 Leaves strictly pinnate ; leaflets opposite. 



Fruiting calyx inflated, enclosing the fruit ; plants densely cespitose, less than 



1.5 dm. high. 2. A. multiceps. 



Fruiting calyx not inflated, much exceeded by the pod. 

 Inflorescence i-3-flowered ; plants dwarf, pulvinate. 



Pods inflated, i -celled, ovoid. 3. A. Hallii. 



Pods not inflated, oblong, almost 2-celled. 4. A. Parryi. 



Inflorescence many-flowered; plants mostly over 1.5 dm. high and pod 



oblong, not inflated. 

 Corolla purple, rarely white. 



Leaflets linear or linear-lanceolate, not silvery-canescent. 



5. A. Lambertii. 



Leaflets oblong-lanceolate to oval, silvery-canescent. 6. A. sericeus, 

 Corolla yellow or white with a purple spot on the keel. 

 Flowers 12-15 mm. long; pods semi-membranaceous. 



7. A. monticola. 



Flowers 18-25. mm. long; pods coriaceous. 8. A. albiflorus. 



Leaflets verticillate. g. A. Richardsonii. 



1. Aragallus deflexus (Pall.) Heller. (Oxytropis deflexa (Pall.) DC.) In 

 the mountains from Sask. and Alaska to N. M Alt. 6000-11,000 ft Near 

 Empire; Lake City; Como, South Park; North Park, near Teller; George- 

 town; Sangre de Cristo Creek; Sargent; Twin Lakes; Alamosa; Kremm- 

 ling; Carson; North Park; Arboles; Dolores; along the Conejos River, 

 north of Antonito; Buena Vista; Empire; Hahn's Peak. 



2. Aragallus multiceps (Nutt.) Heller. (Oxytropis multiceps Nutt.) On 

 dry hills and mountains from western Neb. to Wyo. and Colo. Alt. 4000- 

 10,000 ft. Table Rock; Calhan; Manitou golf links; Colorado Springs. 



Aragallus multiceps minor (A. Gray) Rydb. (Oxytropis multiceps minor 

 A. Gray) In the mountains of Colo. Alt. 8000-10,000 ft. Mountains be- 

 tween Sunshine and Ward; Empire; mountains of Estes Park; headwaters 

 of Clear Creek; Caribou. 



3. Aragallus Hallii (Bunge) Rydb. (Oxytropis Hallii Bunge) On high 

 mountains of Colo. Alt. 10,000-11,000 ft. Little Veta Mountain. 



4. Aragallus Parryi (A. Gray) Greene. (Oxytropis Parryi A. Gray) In 

 high mountain valleys of Colo. Georgetown. 



5. Aragallus Lambertii (Pursh) Greene. (O. Lambertii Pursh) On 

 plains, prairies, hills and table-lands from Minn, and Mont, to Mo. and 

 Colo. Alt. 4000-9000 ft. Boulder; Colorado Springs; Cheyenne Canon; 

 headwaters of Pass Creek; Cucharas River, below La Veta; mesas near 

 Colorado Springs; between Colorado Springs and Cripple Creek; Horsetooth 

 Gulch; Palmer Lake; Howe's Gulch; Poudre Flats; mountains between 

 Sunshine and Ward; near Boulder; Eldora to Baltimore; Hardin's ranch; 

 Table Rock. 



