LEGUMINOS.E. (iTLSE FAMILY.) 123 



or spreading ; the two lateral ones (v'r/.s-) oblique and exterior to the 

 two lower, which last are connivent and commonly more or less coherent 

 by their anterior edges, forming the carina or keel, which usually encloses 

 the stamens and pistil. Stamens 10, very rarely 5, inserted with the 

 corolla, monadelphous, diadelphous (mostly with 9 united into a tube 

 which is cleft on the upper side, and the tenth or upper one separate), 

 or occasionally distinct. Ovary 1-celled, sometimes 2-celled by an intru- 

 sion of one of the sutures, or transversely 2 -many-celled by cross-division 

 into joints ; style simple ; ovules amphitropous, rarely anatropous. Co- 

 tyledons large, thick or thickish ; radicle incurved. Leaves simple or 

 simply compound, the earliest ones in germination usually opposite, the 

 rest alternate ; leaflets almost always quite entire. Flowers perfect, soli- 

 tary and axillary, or in spikes, racemes, or panicles. 



I. Stamens (10) distinct. 



Leaves palmately 3-foliolate or simple ; calyx 4 - 5-lobed ; herbs. (PODALYRIEJJ.) 

 1 Baptisia. Pod inflated. 



2. Thermopsis. Pod flat, linear. 



* * Leaves pinnate ; calyx-teeth short. (SOPHORE.E. ) 



3. Clad rust is. Flowers paniclecl, white. Pod flat. A tree. 



4. Sophora. Flowers racemose, white. Pod terete, moniliform. Herbaceous. 



II. Stamens monadelphous, or diadelphous (9 and 1> rarely 5 and 5); nearly 



distinct in n. 14. 

 Anthers of two forms ; stamens monadelphous ; leaves digitate or simple ; leaflets entire. 



5 Crotalaria. Calyx 5-lobed. Pod inflated. Leaves simple. 



6. Genista. Calyx 2-lipped. Pod flat. Seed estrophiolate. Leaves simple. Shrubby. 



7. Cytisus. Calyx 2-lipped. Pod flat. Seed strophiolate. Leaves 1 - 3-foliolate. Shrubby. 

 f). I.upiniis. Calyx deeply 2-lipped. Pod flat. Leaves 7- Il-foliolate. 



* * Anthers uniform (except in n. 13 and 29). 



- Leaves digitately (rarely pinnately) 3-foliolate ; leaflets denticulate or serrulate ; stamens 

 diadelphous, pods small, 1 - few- seeded, often enclosed in the calyx or curved or 

 coiled. (TRIFOLIE.E.) 



9. Trifolium. Flowers capitate. Pods membranaceous, 1 -6-seeded. Petals adherent to 

 the stamen-tube 



10. Mclilotus. Flowers racemed. Pod coriaceous, wrinkled, 1 - 2-seeded. 



11. Medicago. Flowers racemed or spiked. Pods curved or coiled, 1 -few-seeded. 



-i- -t- Leaves unequally pinnate (or digitate in n. 13); pod not jointed; not twining nor 



climbing (except n. 20). 

 ** Flowers umbellate (solitary in ours) on axillary peduncles. (LOTE.E.) 



12. Hosackia. Leaves 1 - 3-foliolate. Peduncle leafy-bracteate Pod linear. 



+ Flowers in spikes, racemes, or heads. (GALEGE.*:.) 



= Herbage glandular-dotted; stamens mostly monadelphous; pod small, indehiscent, 

 mostly 1-seeded ; leaves pinnate (except in n. 13). 



13. Psoralea. Corolla truly papilionaceous. Stamens 10, half of the anthers often smaller 



or less perfect. Leaves mostly palmately 3 - 5-foliolate. 



14. Ainorpha. Corolla of one petal ! Stamens 10, monadelphous at base. 



15. Dalea. Corolla imperfectly papilionaceous. Stamens 9 or 10 ; the cleft tube of fila- 



ments bearing 4 of the petals about its middle. 



16. Petalostemon. Corolla scarcely at all papilionaceous. Stamens 5 ; the cleft tube of 



filaments bearing 4 of the petals oil its summit. 



