156 PRACTICAL BOTANY. 



Calyx unequally 5-cleft, lower lobe longest. Pod 

 1-seeded. Stamens sometimes slightly monadelphous, the 5 

 alternate anthers often imperfect. Flowers spiked or ra- 

 cemed, white or mostly bluish-purple. Leaves 3- to 5-folio- 

 late, often glandular-dotted. Psoralea. 



337. Leaves 3-foliolate 258 



Leaves with more than 3 leaflets, several or 

 many 260 



258. Pods curved or coiled. Flowers purple or yellow, 

 racemed or spiked. Stipules often toothed or slashed. 



Medicago. 

 Pods straight 1 . 269 



S39. Flowers white or yellow, fragrant, in racemes. Le- 

 gume longer than the calyx, rugose. Melilotus. 

 Flowers blue or violet, in spikes or racemes. Le- 

 gume as long as the calyx, or nearly so. Stipules cohering 

 with the petiole. Plants glandular-dotted. Half of the 



anthers often somewhat imperfect 256 



Flowers yellow, in heads. Stipules ovate 256 



360. Trees or shrubs, often with prickly spines for sti- 

 pules. Calyx slightly 2-lipped. Standard large and rounded, 

 tui'ned back, scarcely longer than the other petals. Pod 1- 

 celled, compressed, elongated, many-seeded. Style bearded 

 inside. Flowers showy, white or tose-color, and sometimes 

 fragrant, in pendulous axillary racemes. Leaflets stipellate. 



Robinia.' 



Herbaceous or suffruticose plants. Calyx equally 



5-toothed or cleft. Flowers white or purplish, spiked or 



racemed 261 



361. Pod longitudinally 2-celled, more or less com- 

 pletely, by the turning inward of the dorsal suture. Stand- 

 ard small, its sides reflexed or spreading. Astragalus. 



Pod 1-celled. Standard large, roundish, usually 

 silky outside. Plants villous, with long, silky, or rusty haira 



(239) Tephrosia. 



363. (80.) Stamens not more than 20 263 



Stamens usually more than 20 25 



