224 Leguminaceae 
LEGUMINACEAE (Fabaceae) Bean Family 
Herbs or shrubs or trees, often vining. Leaves alternate, mostly pinnately or palm- 
ately or ternately compound; stipules present. Flowers irregular, papilionaceous, perfect 
or polygamo-dioicous, solitary or variously clustered. Calyx 4—5-toothed or -cleft, 
sometimes 2-lipped. Petals distinct or somewhat united, usually consisting of | wide 
upper one (standard) and 2 lateral ones (wings) and 2 lower usually united ones (keel). 
Stamens monadelphous or diadelphous or rarely distinct, 10 or 9 (not ours) or rarely 5. 
Pistil 1, simple; ovary superior, usually 1-celled, sometimes lengthwise 2-celled by the 
intrusion of the sutures, sometimes crosswise 2- to several-celled; style 1. Fruit a pod, 
dehiscent by 2 valves or indehiscent, sometimes breaking crosswise into joints. Seeds 
1—many. 
A. Trees, cultivated; stipules often spiny; leaves pinnately compound. 
RoBINIA (p. 234) 
AA. — Shrubs. 
B. Plant spiny; leaves simple, often becoming spines; branches not or hardly 4-an- 
gled, not conspicuously green. ULEx (p. 225) 
BB. Plant not spiny; leaves with 1—3 leaflets, not becoming spines; branches con- 
spicuously 4-angled, dark green. CyTIsus (p. 226) 
AAA. — Herbs, or somewhat shrubby at base. 
C. Leaves with 3 leaflets. 
D. Stamens distinct; stipules free; leaflets entire; flowers yellow, in terminal 
bracted racemes. THERMOPSIS (p. 225) 
DD. Stamens either monadelphus or diadelphous in groups of 9 and 1; stipules 
often adnate; leaflets serrate in most species; flowers not yellow in most, often 
in heads. 
E. Flowers in heads or head-like umbels. 
F. Leaflets entire; mature pod about 2.5 cm. long. Lotus (p. 233) 
FF. Leaflets denticulate; mature pods | cm. or less long. 
4 TRIFOLIUM (p. 230) 
EE. Flowers in spikes or racemes, rarely in’ heads and then the pod coiled and 
the leaflets denticulate. 
G. Leaflets not entire. 
H. Flowers in spikes or heads, yellow or purple; pod curved or coiled, 
often spiny. MeEpIcaAco (p. 230) 
HH. Flowers in long racemes, yellow or white; pod straight, wrinkled. 
MELILoTUus (p. 230) 
GG. Leaflets entire. 
I. Leaves punctate with dark glands or pellucid dots: pod 6 mm. long; 
seed 1. PSORALEA (p. 234) 
II. Leaves not punctate; pod 12 mm. or more long; seeds 2—many. 
ASTRAGALUS (p. 234) 
CC. Leaves palmately compound, with 5—16 leaflets, occasionally some leaves 
with only 3 leaflets. 
J. Leaflets coarsely serrate or dentate. TRIFOLIUM (p. 230) 
JJ. Leaflets entire. 
K. Leaflets 5-16, not punctate, often quite hairy; keel of the corolla acum- 
inate; seeds | or more. LupPINus (p. 226) 
KK. Leaflets 3—7, punctate with dark glands or pellucid dots, glabrous or 
with few hairs; keel of the corolla obtuse; seed 1. PSORALEA (p. 234) 


