PEA FAMILY 177 



(h) Leaflets 3-7, obovate A. Newberryi 

 (i) Leaflets 9-17, lanceo- 

 late to oblong A. Purshii 

 (s) Pods short-hairy or smooth, 



not shaggy 



h. Stems and leaves long- 

 hairy ; leaflets obovoid ; 

 flowers various A. Parry i 



i. Stems and leaves closely 

 silky-hairy to nearly 

 smooth 

 (h) Leaflets smooth above 



or nearly so A. cibdrius 



(i) Leaflets silvery-silky; 

 flowers violet to 

 purple 

 k. Pods tapering at the 



base A. amphioxys 



1. Pods blunt at the base 

 (k) Pods 1.5-2.5 cm. 

 long, mostly 



straight A. missouriensis 



(1) Pods 3-5 cm. long, 



mostly curved A. shortianus 

 (y) Pods without a trace of an intrud- 

 ing partition 

 m. Pods hard and woody 



(m) Flowers yellow; pods about 1 



cm., long A. ftavus 



(n) Flowers purple to whitish; 

 pods 4-8 mm. long, more or 

 less concave below A. grdcilis 



n. Pods papery to leathery 



(m) Stalk of pod usually twice as 



long as calyx ; flowers white, 



12-15 mm. long; pods 2-4 



cm. long A. macrocdrpus 



(n) Stalk of pod usually shorter 



than calyx 

 r. Pods flattened 



