LEGUMINOS^E. (PULSE FAMILY.) 89 



* Flowers perfect and stainiuato. Petals united. 



45. MIMOSA. Filaments distinct. Legume jointed, flat. 



46. SCHRANKIA. Filaments distinct. Legume not jointed, echinate. 



47. PITHECOLOBIUM. Filaments united into a tube below. Legume broad and flat, mealy 



or pulpy within. 



* * Flowers perfect and neutral. Petals distinct. 



48. DESMANTHUS. Sterile filaments filiform. Legume linear, many-seeded. 



49. NEPTUNIA. Sterile filaments flat or petal-like. Legume oblong, few-seeded. 



SUBORDER I. PAPIL.IONACEJE. PULSE FAMILY. 

 1. CROTALARIA, L. RATTLE-BOX. 



Calyx 5-lobed. Vexillum cordate : keel falcate. Stamens monadelphous. 

 Anthers alternately oblong and roundish. Capsule inflated, oblong, many- 

 seeded. Low herbs, with simple leaves ; the upper ones with broad decurrent 

 inversely sagittate stipules. Racemes opposite the leaves. Flowers yellow. 

 Legumes dark-purple. 



1. C. sagittalis, L. Annual ; stems low, branching, shaggy with rust- 

 colored spreading hairs ; leaves nearly sessile, oval or oblong, hairy ; racemes 

 short, 2 - 3-flowered. Barren sandy soil, Florida and northward. June and 

 July. Stem 3' - 6' high. Racemes 2' - 3' long. 



2. C. ovalis, Pursh. Perennial ; stems several, branching, prostrate or as- 

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

 racemes long, 3- 6-flowered. Dry pine barrens, Florida to North Carolina, and 

 westward. May- July. Stem 6' -12' high. Racemes 4' -6' long. Flowers 

 distant. 



3. C. Purshii, DC. Perennial ; stems slender, erect, roughened with scat- 

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

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

 to South Carolina, and westward. May and June. Stem 12'- 18' high. Ra- 

 cemes 6' - 12' long. Flowers distant. 



2. LUPINUS, Tourn. LUPINE. 



Calyx 2-lipped, 5-toothed. Vexillum with the sides reflexed. Keel falcate, 

 acute. Stamens monadelphous, with alternate anthers oblong and roundish. 

 Capsule oblong, compressed, many-seeded ; the seeds often separated by cellular 

 partitions. Herbs, with simple or palmately 5 - many-foliolate leaves, and 

 showy flowers in terminal racemes. 



1 . L. perennis, L. Stem pubescent, erect ; leaves palmately 7 - 9-folio- 

 late ; leaflets obovate-oblong, obtuse, more or less hairy ; stipules minute ; ra- 

 cemes long, loosely many-flowered ; flowers purplish or purplish-blue, rarely 

 white. Var. GRACILIS (L. gracilis, Nutt.) is a more slender and hairy form, 

 with smaller and narrower, often acute leaflets. Dry sandy soil, Florida to 

 Mississippi, and northward. April and May. 1J. Stem 1- l high. 



2. L. villosus, Willd. Biennial ; villous and hoary; stems thick, pros-^ 

 trate or ascending; leaves simple, lanceolate-oblong, mostly acute, long-petioled ; 



8* 



