POLYPETALOUS EXOGENOUS PLANTS. 215 



Sub-order II. CaBsalpinieae. CorolLi irregular and 

 somewhat papilionaceous, or almost regular, imbricated in 

 the bud; the upper petal interior. Stamens separate. 

 Embryo straight. 



Flowers perfect, somewhat papilionaceous. Calyx 5-toothed. Leaves simple. 



Cercis. 



irregular, perfect. Calyx deeply 5-parted. Anthers dissimilar. Leaves 



pinnate Cassia. 



polygamous, almost regular. Calyx 8-5-parted. Leaves pinnate and 



bipiunate Gleditschia. 



perfect, somewhat papilionaceous. Calyx 5-parted, rather unequal. 



Leaves bipinnate Hoopesia. 



Sub-order III. MimoseaB. Corolla regular, hypogy- 

 nous, valvate in the bud. Stamens distinct or united, often 

 very numerous, inserted with the petals. Embryo straight. 

 Leaves pinnate or 2-4-pinnate. Flowers polygamous. 



* Flowers perfect and staminate. Petals united. 



Filaments distinct. Legume jointed, flat Mimosa. 



• not jointed, echinate Schrankia. 



united into a tube below. Legume broad and flat, mealy or pulpy 



within PiTHECOLOBIUM, 



** Flowers perfect and neutral. Petals distinct. 



Sterile filaments filiform. Legume linear, many-seeded...-. Desmanthus. 



flat or petal-like. Legume oblong, few-seeded Nepttjnia. 



PULSE FAMILY. Suh-order I., Papilionace^. 

 CROTALARIA, Rattle-box. 



Calyx 5-lobed ; vexillum cordate ; keel falcate ; stainefis 

 monadelphous ; anthers alternately oblong and roundish ; 

 ca^isule inflated, oblong, many-seeded. — Low lierls, with 

 simple leaves ; the upper ones with broad decurrent inverse- 

 ly sagitate stipules ; racemes opposite the leaves ; flowers 

 yellow ; legumes dark purple. 



C. PuRSHii, DO. Stems slender, erect, roughened with 



