= 
236 Leguminaceae 

F. Herbage hirsute; peduncles 1/2 as long as the leaves; calyx-teeth 1/5 as 
long as its tube. E. A. purshij Doug]. 
FF. Herbage woolly-pubescent; peduncle as long as the leaves; calyx-teeth 
as long as its tube. E. A. leucocystis Gr. 
EE. Corolla purple or violet’ or greenish. 
G. Calyx-teeth as long as the calyx-tube; leaflets 21—25. E. 
A. inflexus Doug]. 
GG. Calyx-teeth '% as long as the calyx-tube; leaflets 1 1—1/7. Ee 
A. utahensis T. & G. 
GGG. Calyx-teeth 1/3 as long as the calyx-tube; leaflets 13—21. 
H. Hairs incumbent and appressed; pod glabrate at maturity. E. (A. 
allanaris. ) A. glareosus Doug]. 
HH. Hairs loose and tangled; pod shaggy-pubescent at maturity. E. 
A. booneanus Nels. 
AA. Pod glabrous. 
I. Stems erect or ascending; leaflets 13-20 mm. long; racemes few-flowered; 
pod’-1..9-=2.5 “em. long 1 U, 
A. pacificus Sheld. 
II. Stems decumbent; leaflets 12 mm. or less long; racemes many-flowered; pod 5 
cm. long. E. (A. dorvonioides.) 
A. succumbens Doug! 
GROUP 3 
A. Pod curved or coiled; calyx oblique. 
B. Leaflets 12—17 mm. long; calyx [0—13.mm. long. E. 
A. gibbsii Kell. 
BB. Leaflets 2—12 mm. long; calyx 6—8 mm. long: 
C.. Pod coiled. E. A. speirocarpus Gray 
CC. Pod merely curved, not coiled. 
D. Stipe of the pod much exceeding the calyx. E. 
A. speirocarpus falciformis Gray 
DD. Stipe of the pod about equaling the calyx. E. (A. whitedii. ) i 
A. sinuatus Pip. 
AA. Pod straight or nearly so; calyx usually not oblique. | 
E. Both sutures of the pod intruded. U. 
A. accidens Wats. 
EE. Only the dorsal sutures of the pod intruded; pod 1—2-celled. 
Fy « Leaflets 7—=!] lel Sera, long. Ww, 
A. catalinensis Nutt. : : 
FF. Leaflets 11—31, 4 or more mm. long. 
G. Pod compressed on its sutured sides. | 
H. Leaflets broadly oval, glabrous. E. . 4 
A. beckwithii T. & G. 
HH. Leaflets oblong to lanceolate, hairy at least beneath. FE. (P. arrecta 
leibergii; A. palousensis; probably A. boiseanus.) 
A. arrectus Gray 
GG. Pod compressed on its unsutured sides or not at all. 
I. Stems 0.5—1.5 dm. high. 
J. Leaflets 4—6 mm. long, oblong to linear; pod reflexed. FE. 
A. misellus Wats. 
JJ Leaflets 6—12 mm. long, oval to elliptic; pod pendent. E. 
A. alpinus L. (Alpine Rattle-weed) 




