136 LEGUMINACEAE (BEAN FAMILY) 



DD. Stamens either monad elphous or diadelphous in groups of 9 and i; stipules 

 often adnate; leaflets serrate in most species; flowers not yellow in most, often 

 in heads. 

 E. Flowers in heads or headlike umbels. 



F. Leaflets entire; mature pod about 2.5 cm. long. LOTUS (p. 140) 

 FF. Leaflets denticulate; mature pods i cm. or less long. 



TRIFOLIUM (p. 138) 



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. MEDICAGO (p. 137) 



HH. Flowers in long racemes, yellow or white; pod straight, wrinkled. 



MELILOTUS (p. 137) 

 GG. Leaflets entire. 



I. Leaves punctate with dark glands or pellucid dots; pod 6 mm. long; 

 seed i. PSORALEA (p. 140) 



II. Leaves not punctate; pod 12 mm. or more long; seeds 2 to many. 



ASTRAGALUS (p. 141) 



CC. Leaves palmately compound, with 5-16 leaflets, occasionally some leaves 

 with only 3 leaflets. 



J. Leaflets coarsely serrate or dentate. TRIFOLIUM (p. 138) 



JJ. Leaflets entire. 



K. Leaflets 5-16, not punctate, often quite hairy; keel of the corolla acumi- 

 nate; seeds i or more. LUPINUS (.p. 137) 

 KK. Leaflets 3-7. punctate with dark glands or pellucid dots, glabrous or with 

 few hairs; keel of the corolla obtuse; seed i. PSORALEA (p. 140) 

 CCC. Leaves pinnately compound, with 4 or more leaflets or occasionally some 

 leaves with fewer. 



L. Leaves with an odd leaflet at the tip, without tendrils. 

 M. Herbage conspicuously glandular-dotted. 



N. Leaflets 5-9, narrowly oblong to obovate, 1-12 cm. long; peduncles much 



exceeding the leaves, terminal; flowers deep purple; stamens 5; pod not 



prickly, i-seeded. E. (Gk. petalon = a petal, stemon = a stamen; from 



the union of the two in the flower.) Petalostemon ornatus (PRAIRIE CLOVER) 



NN. Leaflets 13-17, oblong to oblong-lanceolate, 2.5-5 cm. long; peduncles 



about equaling the leaves, axillary; flowers ochroleucous ; stamens 10 ; 



pod prickly with hooked prickles, 2-6-seeded. E. Glycyrrhiza alba is the 



source of commercial licorice. (Gk. glykys = sweet, rhiza = a root; the 



root is sweet.) Glycyrrhiza lepidota (WILD LICORICE) 



MM. Herbage not glandular-dotted; stamens 10; pod not prickly. 



O. Flowers solitary or in umbels; pod linear, not jointed; leaflets 3-15. 



LOTUS (p. 140) 

 OO. Flowers in spikes or racemes, rarely solitary and then the pod not linear; 



leaflets often more numerous. 



P. Pod 2-4-jointed, reticulate. HEDYSARUM (p. 141) 



PP. Pod not jointed, often veiny but hardly reticulate. 

 Q. Keel of the corolla acute or subulate at apex. ARAGALLUS (p. 141) 

 QQ. Keel of the corolla obtuse at apex. ASTRAGALUS (p. 141) 



