« 
Leguminaceae 237. 
pie tems. 5——G'-dm,. high: flowers~ white’ or yellow. 
K. Stems sparsely leafy; leaflets oblong to linear, pubescent above; flowers 
white; pod canescent. E. 
A. howellii Gray 
KK. Stems very leafy; leaflets oblong to oval, glabrous above; flowers 
yellowish; pod glabrous. E. 
A. racemosus Pursh 
EEE. Neither of the sutures of the pod intruded: pod 1-celled. 
L. Pod 0.8—1.7 cm. long, pubescent. 
M. Leaflets 11—19, 8—12 mm. long; flowers yellowish, pendent. E. 
A. californicus Gr. 
NiVirweleaflets 19-—23,> 12-425) mm. long; flowers whitish, reflexed. E. 
(A. cyrtoides.) A. collinus Doug]. 
-LL. Pod 2.3—5 cm. long, glabrous. 
N. Peduncles not exceeding the leaves; pod flat. E. (A. multiflorus.) 
A. tenellus Pursh 
NN. Peduncles much exceeding the leaves. 
O. Calyx white-pubescent; stipules subulate, 4-6 mm. long, acuminate; 
pod 12—17 mm. long, turgid. E. 
A. tweedyi Canby 
OO. Calyx black-pubescent; stipules triangular, 2 mm. long, acute; pod 
1931 mm. long, flat. E. (A. filipes.) 
A. stenophyllus T. & G. 
GROUP 4 
A. A. Pod 2-celled or very nearly so by the intrusion of one or both sutures. 
B. Both sutures of the pod intruded; flowers purplish. 
| C. Plant glabrous thruout; leaflets obcordate to orbicular; pod 12—20 mm. 






long. E. A. araneosus Sheld. 
CC. Plant somewhat hairy; leaflets obovate to oblong; pod 8—12 mm. long. 
: E. (A. diaphanus.) A. lentiginosus Doug. 
BB. Only the dorsal sutures of the pod intruded; flowers various in color, often 
purplish. 
D. Pod ovoid to ovate-oblong, less than 3 times as long as wide. 
FE. Petals yellowish; leaflets obovate to oblong; pod glabrous. FE, 
A, salinus How. 
EE. Petals purplish; leaflets various in form; pod hairy. 
F. Calyx-teeth 1/2 as long as the calyx-tube; leaflets oblong or narrower; 
spike oblong; stem rather stout. FE. (A. adsurgens.) 
A. nitidus Pursh 
FF. Calyx-teeth about equaling the calyx-tube; leaflets oblong or wider; 
spike head-like; stem weak. E. (A. hypoglottis for our region.) 
A. agrestis Dougl. 
DD. Pod narrower, more than 4 times as long as wide. 
G. Herbage glabrous; leaflets 17-21, oblong, retuse. U. 
A. umbraticus Sheld. 
GG. -Herbage not glabrous; leaflets 5—-17, either not oblong or not retuse. 
H. Leaflets obovate, usually emarginate; calyx-teeth about equaling the 
calyx-tube; pod quite sickle-shaped. E. 
A. drepanolobus Gray 
HH. Leaflets oblong to linear, obtuse to acute; calyx-teeth distinctly shorter 
* than the calyx-tube; pod nearly straight. 

