212 FABACEAE. 



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

 Jones) On dry hills and plains of Wye. 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. ARAGALLTJS Necker. Oxytrope, Loco-weed. 



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



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



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 



ji.S dm. high. ^s. 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. Lafnbertii. 

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

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

 Flowers 12-15 J^nm. long; pods semi-membranaceous. 



7. A. monticola. 

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



Leaflets verticillate. 9. A. Richardsonii. 



1. Aragallus deflexus (Pall.) Heller. {Oxytropis deilexa (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 Caiion; 

 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. 



