LEGUMINACEAE (BEAN FAMILY) 137 



LL. Leaves without an odd leaflet at the tip but often with tendrils. 

 R. Style terete above, with a tuft of hairs at tip. VICIA (p. 141) 



RR. Style somewhat flat above, with hairs down the concave side for a short 

 distance from the tip. LATHYRUS (p. 142) 



THERMOPSIS 



Perennial, stout, erect. Leaflets petiolulate ; stipules foliaceous ; bracts 

 of the raceme herbaceous, persistent. Calyx 4~5-cleft. Standard roundish, 

 shorter than the wings; wings oblong; keel obtuse, equaling the wings. 

 Stamens 10. Pod narrow, flattish. (Gk. thermos = the lupine, opsis = 

 like.) 



A. Two upper calyx lobes united into a 2-toothed segment. 



B. Racemes short, loosely flowered; bracts acute; calyx teeth acute. U. T. gracilis 

 BB. Racemes long, densely flowered; bracts acuminate; calyx teeth acuminate. U. 



T. robusta 

 AA. Two upper calyx lobes united only about as much as the others. 



C. Leaflets oblong-oblanceolate to obovate; plant with somewhat fleshy rootstock. 

 W. E. T. montana 



CC. Leaflets oval to narrowly elliptic; plant with woody caudex and roots. E. 



T. xylorhiza 



LUPINUS (LUPINE) 



Flowers in terminal racemes or spikes, mostly showy. Calyx deeply 

 2-lipped ; upper lip 2-clef t or -toothed or rarely entire ; lower lip entire or 

 3-toothed. Wings united at the summit; keel falcate. Stamens mona- 

 delphous; alternate filaments longer. Stigma bearded. Pod coriaceous. 

 (L. lupus = a wolf ; it was supposed to devour that which made the soil 

 fertile.) Species too difficult. 



MEDICAGO (MEDIC) 



Leaves small. Flowers small, in axillary heads or spikes. Calyx teeth 

 nearly equal. Standard obovate or oblong; wings oblong; keel obtuse. 

 Stamens 10, diadelphous, in groups of i and 9. Pod indehiscent. Seeds 

 i to few. (Gk. medike = the Alfalfa ; because the Greeks got this from 

 Media.) 



A. Perennial, 5-12 dm. high; flowers violet, in spikes about 6 cm. long. W. E. 

 One of our best hay plants. M. sativa (ALFALFA) 



AA. Annual, 1.5-6 dm. high; flowers yellow, in heads about 2 cm. long. 

 B. Pod several-seeded, spiral, spiny on the edges. W. E. 



M. dentlculata (BUR CLOVER) 

 BB. Pod i -seeded, curved, not spiny. W. E. M. lupulina (NONESUCH) 



MELILOTUS (MELILOT) 



Annual or biennial. Leaves petioled. Flowers small. Calyx teeth 

 nearly equal. Standard obovate or oblong ; wings oblong ; keel obtuse. 

 Stamens 10, diadelphous, in groups of 9 and i. Pod ovoid or globose, in- 



