LEGUMINOS^E. (PULSE FAMILY.) 147 



39. RHYNCHOSIA, Lour. 



Calyx somewhat 2-lipped, or deeply 4- 5-parted. Keel scythe-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 herbs, pin- 

 nately 3-f oliolate, or with a single leaflet, not stipellate. Flowers yellow, rac- 

 emose or clustered. (Name from f>vyx 5 > a beak, from the shape of the keel.) 



1. R. tomentdsa, Hook. & Am. Trailing and twining, the stem and 

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

 rhombic, acute or acutish; racemes few-flowered, almost sessile in the axils\ 

 jalyx about as long as the corolla, 4-parted,the upper lobe 2-cleft ; pod oblong. 

 (R. tomentosa, var. volubilis, Torr. $ Gray.} Dry soil, Va. to Fla. and Tex. 



2. R. er^cta, DC. Erect, 1-2 high ; stem and leaves more or less tomen- 

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

 dunculate. (R. tomentosa, var. erecta, Torr. $ Gray.) Del. to Fla. and Miss. 



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

 ing ; leaflets solitary (rarely 3), round-reniform, very obtuse or apiculate; ra- 

 cemes few-flowered, sessile in the axils. (R. tomentosa, var. monophylla. 

 Torr. fr 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-shaped 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 Judas-tree.) 



1. C. Canadensis, L. (RED-BUD.) Leaves pointed ; pods nearly sessile 

 above the calyx. Rich 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 unequal, spreading. Sta- 

 mens 5- 10, unequal, and some of them often imperfect,. spreading; anthers 

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

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

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



* Leaflets large; stipules deciduous; the three upper anthers deformed. and im- 

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

 glabrous. 



1. C. Marilandica, L. (WILD SENNA.) Stem 3-4 high; leaflets 6-9 

 pairs, lanceolate-oblong, obtuse ; petiole with a club-shaped gland near the base ; 

 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- 



