96 LEGUMIXOS.E. (PULSE FAMILY.) 



SUBORDER III. MIMOSE^E. Corolla regular, bypogynous, valvate in 



the bud. Stamens distinct or united, ofteu very numerous, inserted with 

 the petals. Embryo straight. Leaves pinnate, or 2 - 3 pinnate. Flowers 

 polygamous. 



* Flowers perfect, and staminate. Petals mostly united. 

 H- Herbs. Leaves sensitive. 



4S. MIMOSA. Legume broad, Hat, jointed. Stamens 4 -5. 



4'J. SCHRANKIA. Legume linear, angular, jointless. Stamens 8 -10. 



a- -i- Trees or shrubs. 



50. PITHECOLOBIUM. Legume coiled or twisted. Leaflets 4, large. 



51. ACACIA. Legume straight or bent. Leaflets numerous, small. 



* * Flowers perfect and neutral. Petals distinct. 



52. DESMANTHUS. Sterile filaments filiform or petal-like. Stamens 5 or 10. 



SUBORDER I. PAPILIONACE^E. PULSE FAMILY. 



1. CROTALARIA, L. RATTLE-BOX. 



Calyx 5-parted. Vexillum cordate ; keel falcate. Stamens monadelphous. 

 Anthers alternately oblong ami roundish. Legume inflated, oblong, many- 

 seeded. Chiefly herbs, with simple or compound leaves; the stipules often 

 broad, decurrent, inversely sagittate. Racemes mostly opposite the leaves. 

 Flowers yellow. Legumes dark purple. 



* Leaves simple. 



1. C. sagittalis, L. Annual; stems low, branching, villous or hairy; 



leaves nearly sessile, oval or oblong, hairy; racemes short, 2-3-flowered. 

 Barren sandy soil. June -July. Stem 3'- 6' high. Racemes 2'-3' long. 



2. C. OValis, Pursh. Perennial ; stems several, branching, prostrate or 

 ascending, rough with appressed hairs; leaves short-petioled, oval or oblong, 

 hairv ; racemes long, 3-6-flowered. Dry [line barrens. May -July. 

 Stem 6'- 12' high. Racemes 4'- 6' long. Flowers distant. 



3. C. Purshii, DC. Perennial ; stems slender, erect, roughened wish 

 scattered appressed hairs ; leaves thick, smooth above, the lower ones oblong, 

 the upper linear; racemes long, 5 - 10-flowered. Flat grassy pine barrens in 

 the lower districts. May -June. Stem 12' -18' high. Racemes 6' -12' 

 long. Flowers distant. 



4. C. retusa, L. Annual; stem erect; leaves cuneate-oblong, retuse, 

 glabrous above, silky-pubescent beneath, pellucid-dotted ; stipules minute or 

 none; racemes terminal, many-flowered ; legumes oblong, glabrous. South 

 Florida. Stem l-2 high. Flowers large. 



5. C. maritima, Chapm. Perennial?, silky-pubescent; stem decumbent, 

 excessively branched ; leaves exstipulate, varying from oblong to linear, nearly 

 sessile, more or less succulent ; racemes very numerous, opposite the leaves, 

 2 -4-flowered ; sepals lanceolate, as long as the small petals ; legume oblong, 

 glabrous. Coast and Keys of South Florida. May. 



