PEA FAMILY [71 



a. Leaflets of the leaf opposite 



(1) Pod enclosed in the calyx, or the tip pro- 



jecting somewhat 



(a) Flowers 1-3, rarely 5, in a cluster, pur- 



ple; pod in the inflated calyx A. miilticeps 



(b) Flowers several in a dense head or 



spike; pod filling the calyx and often 

 breaking it 



x. Mature calyx split down one side ; flow- 

 ers violet with oblong wings A. lagopus 



y. Mature calyx not split ; flowers purple 



to white, with dilated wings A. nanus 



(2) Pod much longer than the calyx 



(a) Pod bladdery-inflated, ovate; flowers vio- 



let, 2 in a cluster A. podo carpus 



(b) Pod not bladdery-inflated 



x. Flowers 1-3 in a cluster; pods oblong; 



leaflet pairs 7-9 A. Pdrryi 



y. Flowers several to many in a head or 

 spike 

 (x) Flower stalk and cluster somewhat 



sticky-hairy ; leaflet pairs 10-25 A. viscidus 

 (y) Flower stalk and cluster not sticky- 

 hairy 

 m. Flowers 15-30 mm. long, red-pur- 

 ple to blue or white ; leaflets silky 

 or silvery to nearly smooth, 

 lance-oblong to linear A. Lamberti 



n. Flowers 10-15 mm. long 



(m) Flowers purple or violet A. monticola 



(n) Flowers yellow or yellowish 

 r. Leaflets 8-13 • flowers 3-8 in a 



cluster; calyx black-hairy A. alpicola 

 s. Leaflets 25-31 ; flowers many in 

 a dense cluster; calyx white- 

 silky A. villosus 



b. Leaflets irregularly crowded, in whorls; plants 



silvery-silky, 6-18 in. high; flowers blue, 10- 



15 mm. long, in a long densely silky spike A. splendens 



