238 Leguminaceae 
I. Stems 1.5—-3 dm. high; leaflets 4—10 mm. long; raceme loose. 
A. obscurus Wats. 
II. Stems 4.5—6 dm. high; leaflets 12—-25 mm. long; raceme dense. E. 
A. mortoni Nutt. 
AA. Pod I-celled altho one or both sutures may be somewhat intruded. 
J. Leaflets rigid, prickly-pointed; flowers 1—3, nearly sessile in the leaf-axils. E. 
A. viridis Sheld. (Prickly Rattle-weed) 
JJ. Leaflets not rigid, not prickly pointed; flowers often more numerous, in spikes 
or racemes. 
K. Only the dorsal suture of the pod intruded. E. 
A. iodanthus Wats. 
KK. Only the ventral suture of the pod intruded. E. 
A. cibarus Sheld. 
KKK. _ Neither suture of the pod intruded. 
L. Pod linear. 
M. Plant white- or silky-pubescent; leaflets lanceolate or linear or oblan- 
ceolate; keel of the corolla with long inflexed beak. E. (A. convallarius. ) 
A. campestris Gray 
MM. Plant not white- nor silky-pubescent altho usually hairy; leaflets lin- 
ear. 
N. Plant 1—2 dm. high; leaflets 713, linear or lanceolate; calyx- 
teeth about as long as the calyx-tube. E. 
A. decumbens Gray 
NN. Plant 2—4 dm. high; leaflets 9—21, linear to oblanceolate; calyx- 
teeth about | /3 as long as the calyx-tube. E. 
A, serotina Gray 
LL. Pod wider than linear. 
O. Pod chartaceous. 
P. Leaflets 2—4 mm. long, lanceolate, 11—13. E. 
A. bourgovii Gray 
PP. Leaflets 48 mm. long, linear or oblong, 7—13. 
Q. Stems 5—I5 cm. high; leaflets linear, acute; peduncles about 
equaling the leaves, |—-3-flowered. E. 
A. tegetarius Wats. 
QQ. Stems 20—25 cm. high; leaflets broadly linear to oblong, obtuse; 
peduncles much exceeding the leaves, 5—-7-flowered. FEF. (A. m- 
crocystis.) A, miser Doug]. 
OO. Pod coriaceous. 
RR:> Leaflets 3-112 
S. Corolla yellow; peduncles exceeding the leaves; calyx-teeth nearly 
equaling the calyx-tube. E. 
_A, flavovirens Sheld. 
SS. Corolla light violet; peduncles shorter than the leaves; calyx- 
teeth much shorter than the calyx-tube. E. : 
A. chamaeleuce Gray 
RR. + Leaflets: 11—21. 
T. Pod ovoid, about 1 cm. long; peduncle much exceeding the leaves; 
leaflets oblong to obovate. E. 
A. adanus Nels. 
TT. Pod narrowly oblong, about 2 cm. long; peduncle hardly exceed- 
ing the leaves; leaflets linear. E. 
A, conjunctus Wats. 




