LEGUMINOSAE. 143 



hypogynous, usually papilionaceous, that is, with the upper or 

 odd petal (standard) larger than the others and usually turned 

 backward or spreading; the two lateral ones (wings) oblique and 

 exterior to the two lower; the last pair connivent and commonly 

 more or less coherent by their anterior edges, forming the keel, 

 which usually encloses the stamens and pistil; stamens 10, rarely 

 5 or many, monadelphous, diadelphous or occasionally distinct; 

 pistil 1, 1-celled or several-celled by the intrusion of partitions, 

 free; ovules 1-many; fruit a legume; endosperm mostly none. 



Stamens distinct. 205. THERMOPSIS, 143. 



Stamens monadelphous or diadelphous. 



Anthers of two forms, round and oblong. 206. LUPINUS, 144. 



Anthers all alike. 



Leaves palmate or trifoliolate. 



Foliage glandular-dotted. 207. PSORALEA, 146. 



Foliage not glandular-dotted. 



Flowers in heads. 208. TRIFOLIUM, 146. 



Flowers in racemes. 



Racemes close, spike-like; pods 



curved or twisted. 209. MEDICAGO, 148. 



Racemes loose, long; pods straight. 210. MELILOTUS, 149. 

 Leaves pinnate. 



Foliage dotted with conspicuous glands. 211. GLYCYRRHIZA, 149. 

 Foliage not dotted with conspicuous 



glands. 

 Leaves abruptly pinnate, usually with 



tendrils. 

 Style filiform, hairy near the tip 



only. 212. VICIA, 149. 



Style flattened, hairy on the inner 



side. 213. LATHYRUS, 150. 



Leaves odd pinnate; with no tendrils. 

 Flowers in umbels or solitary; pods 



linear. 214. HOSACKIA, 151. 



Flowers in spikes or racemes, rarely 

 solitary, then the pods not linear. 



215. ASTRAGALUS, 151. 



205. THERMOPSIS. 



Perennial herbs; leaves alternate, palmately 3-foliolate, with 

 large foliaceous stipules; flowers large, yellow, in terminal or 

 axillary racemes; calyx campanulate, the lobes equal and sepa- 

 rate or the two upper united ; standard nearly orbicular, equalling 

 the oblong wings and about equalling the keel; stamens 10, dis- 

 tinct; ovary sessile or short-stipitate ; ovules numerous; pod 

 sessile or short-stipitate in the calyx, flat, linear, straight or 

 curved. 



Thermopsis montana Nutt. Stout, 60-100 cm. high, the glabrous some- 

 what glaucous stems slightly branched above; leaflets* oblong or oval, mostly 



