LEGUMINOSAE (PEA FAMILY) 293 



Calyx distended or split by the turgid included pod. 



Corolla violet-blue; the wings oblong . . . . . 4. A. lagopus. 



Corolla purple; the wings dilated and emarginate . . 5. A. nanus. 



Pod at length evidently exceeding the calyx. 



Calyx somewhat bladdery-inflated . . . . . . 6. A. Blankinshipii. 



Calyx not inflated. 



Pod bladdery-inflated, membranous . . . . . 7. A. podocarpus. 



Pod not bladdery-inflated, often turgid or coriaceous 



Flowers 1-3 8. A. Parryi. 



Flowers several or many. 



Plants somewhat glandular-viscid. 



Leaflets 17-31 9. A. viscidulus. 



Leaflets 25-55 10. A. viscidus. 



Plants neither glandular nor viscid. 

 Leaves simplv pinnate. 

 Pod nearly 2-celled. 



Flowers yellow or yellowish . . . . 11. A. gracilis. 



Flowers purple or ochroleucous . , 12. A. dispar. 



Pod half 2-celled or less. 

 Flowers purple or violet. 



Pod submembranous . . . . . 13. A. monticola. 



Pod coriaceous 14. A. Lambertii. 



Flowers white or yellowish. 



Dwarf alpine plants . ..... 15. A. alpicola. 



Stout and tufted. 



Corolla yellowish throughout . . . 16. A. villosus. 

 Corolla white or yellowish; the keel always 



purple-tipped . . . . . 17. A. albiflorus. 



Leaflets very numerous and subverticillate . . 18. A. Richardsonii. 



1. Aragallus deflexus (DC.) Heller, Cat. N. A. PI. 4. 1898. Loosely silky- 

 pubescent; leafy-stemmed or more rarely depauperate and nearly stemless; 

 taller forms over 3 dm. high: leaflets crowded in 12-16 pairs, lanceolate 

 to oblong, 6-12 mm. long; stipules free: peduncles much surpassing the leaves; 

 flowers rather small (about 6 mm. long), in a short and close or in fruit 

 lengthened and open spike: pod oblong-lanceolate, not stipitate, 1-celled, 

 much surpassing the calyx. In the mountains from British America to 

 southern Colorado and westward to Utah. Subalpine forms are often depau- 

 perate and almost stemless [A. folioloxus (Hook.) Rydb.]. 



2. Aragallus multiceps (Xutt.) Heller, 1. c. Canescently silky; malted 

 caespitose, subcaulescent, 3-7 cm. high: leaflets 7-9: peduncles weak, 1-2- 

 flowered; flowers purple: pod stipitate, wholly inclosed in the bladdery, ovate- 

 globose calyx, turgid, ovate, 1-celled. Granite soils, middle altitudes; Wy- 

 oming and Colorado. 



2a. Aragallus multiceps minor (Gray) A. Nels. Erythea 7: 57. 1899. 

 Pulvinate or depressed caespitose: leaflets very small: fruiting calyx much 

 reduced. Subalpine gravelly barrens. 



3. Aragallus cpllinus A. Xels. Erythea 7: 57. 1899. Canescently appressed- 

 pubescent and silky-villous; crown woody, covered with the persistent peti- 

 oles: leaves and scapes tufted on the crowns: scapes 1-2 dm. long, exceed- 

 ing the leaves: leaflets 7-13, oblong to linear-lanceolate, acute, 10-30 mm. 

 long: spike 10-20-flowered ; bracts leaf-like, greenish, equaling the calyx, 

 or nearly so: calyx inflated in fruit, globose-urceolate: corolla white or 

 yellowish, the standard streaked with purple, twice as long as the calyx: 

 pod turgid, nearly filling the calyx; style abruptly flexed near its apex and 

 protruding from the narrowed mouth of the calyx. Northern Wyoming and 

 Montana. 



4. Aragallus lagopus (Xutt.) Greene, Pitt. 3: 212. 1897. Canescently 

 silky, with loose villous hairs; nearly stemless and rather dwarf: scapes sur- 

 passing the leaves, 5-6-flow r ered : leaflets 9-13, lanceolate or oblong, 6-8 mm. 

 long: flowers bright violet: calyx cylindrical, silky: pod ovate, thin mem- 

 branacepus and almost bladdery, obtuse, abruptly tipped with the persistent 

 style, slightly protruding from the calyx which splits down one side. Moun- 

 tains of Wyoming and Montana. 



5. Aragallus nanus (Nutt.) Greene, 1. c. Silvery with appressed silky 

 pubescence: leaflets 3 or 4 or rarely 6 pairs, narrowly lanceolate: flowers 

 purple or whitish: pod turgid, oblong, somewhat coriaceous, the acuminate 



