LKGUMINOS/E. (I'ULSE FAMILY.) 89 



* Flowers perfect and stamioate. Petals united. 



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



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



4T. 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. PAPILIO]\ACE^. Pulse Family. 



1. CROTALARIA, L. Rattle-box. 



Calyx 5-lobed. Vexilluni cordate : keel falcate. Stamens monadelphons. 

 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 vith rust- 

 colored spreading hairs ; leaves nearly sessile, oval or oldong, 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 appresscd hairs ; leaves short-pctiolcd, oval or oblong, hairv ; 

 racemes long, 3 - 6-flo\vercd — 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' higli. Ra- 

 cemes 6' -1 2' long. Flowers distant. 



2. LUPINUS, Tourn. Lupine. 

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

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

 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 

 Missi sippi, and northward. April and May. \\. — 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* 



