LEGUMINOSiE. (iTLSE FAMILY.) 147 



39. RHYNCHOSIA, L.mr. 



Calyx somewhat 2-Hj)ped,or deeply 4-5-parte<l. Keel srytho-shaped, or in- 

 curved at the apex. Stamens diadelphous. Ovules only 2. Pod 1 -2-seeded, 

 short and flat, 2-valved. — Usually twining or trailing perennial herhs, pin- 

 uately 3-foli(jlate, or with a single leaflet, not stipellate. Flowers yellow, rac- 

 emose or clustered. (Name from pvyxoSfCi beak, from the shape of the keel.) 



1. R. tomentbsa, Hook. & Am. Trailing and ticiniwj, the stem and 

 leaves more or less pubescent with spreading hairs ; leaflets 3, roundish or round- 

 rhombic, acute or acutish ; racemes few-flowered, almost sessHe in the arils ; 

 calyx about as long as the corolla, 4-parted,the u])por lohe 2-cleft; pod oblong. 

 (R. tomentosa, var. volubilis, Torr. ij- G'rai/.) — Dry soil, Va. to Fla. and Tex. 



2. R. erecta, DC. Erect, 1-2° high ; stem and leaves more or less tomen- 

 tose ; leajlets 3, oval to oblong, obtuse or acutish ; racemes short and shortly pe- 

 dunculate. (K. tomentosa, var. erecta, Torr. ^ Gray.) — Del. to Fla, and Miss. 



3. R. renif6rmis, DC. Dwarf and upright, 3-8' high ; pubescence spread- 

 ing ; leajiets solitarij (rarely 3), round-ren if or m, very ohtuse or apiculate; ra- 

 cemes few-flowered, sessile in the axils. (11. tomentosa, var. mouophylla, 

 Torr. Jf Gray.) — Va. to Fla. and Miss. 



40. CERCIS, L. Red-bud. Judas-tree. 



Calyx 5-toothed. Corolla imperfectly papilionaceous ; standard smaller than 

 the wings, and enclosed by them in the bud ; the keel-petals larger and not 

 united. Stamens 10, distinct, declined. Pod oblong, flat, many-seeded, the 

 upper suture with a winged margin. Embryo straight. — Trees, with rounded 

 heart-sha})ed simple leaves, caducous stipules, and red-purple flowers in umbel- 

 like clusters along the branches of the last or preceding years, appearing before 

 the leaves, acid to the taste. (The ancient name of the (Oriental .Tudas-tree.) 



1. C. Canadensis, L. (Red-bud.) Leaves pointed ; pods nearly sessile 

 above the calyx. — Kicli soil, N. Y. and N. J. to Fla., west to S. Minn., Kan., 

 and La. A small ornamental tree, often cultivated. 



41. CASSIA, Tourn. Senna. 



Sepals 5, scarcely united at base. Petals 5, little uncciual, spreading. Sta^ 

 mens 5- 10, unccjual, and some of them often inijierfect, spreading; anthers 

 opening l)y 2 pores or chinks at the apex. Pod many-seeded, often with cross 

 partitions. — Herbs (in the United States), with simply and abrujitly pinnate 

 leaves, and mostly yellow flowers. (An ancient name of obscure derivation.) 



♦ Leaflets large ; stipides deciduous ; the three upper anthers deformed and im- 

 perfect ; flowers in short axillary racemes, the upper ones panicled ; herbage 

 glabrous. 



1. C. Maril&ndiea, L. (Wiud Senna.) Stem 3-4° high; /^^rz/r/s 6-9 

 pairs, lanceolate-oblong , obtuse ; petiole with a club-shaped gland near the b:ise; 

 pods linear, slightly curved, flat, at first hairy (2-4' long) ; root perennial. — 

 Alluvial soil, N. Eng. to Fla., west to Mich., S. E. Neb., Kan., and La. 



2. C. T6ra, L. Annual; leaflets 3 or rarely 2 pairs, obovate, obtuse, with 

 an elongated gland between those of the lower pairs or lowest pair ; pods slen- 



