Lathyrus. LEGUMlNOSiE. 273 



nerved, pubescent; the upper ones lanceolate, acuminate, villous ; calyx and 

 pedicels pubescent. Sclrwtiin. in Loughs 2iid cuped. upp. 

 Upper Mississippi, Mr. Keating. 



2. ERVUM. Linn.; Juss. gen. p. 360. 



Calyx deeply 5-clcft ; the segments nearly equal, linear, acute, about the 

 length of the corolla. Style filiform : stigma glabrous. Legume oblong, 2- 

 4-seeded. Seeds orbicular or globose. — Annuals. Leaflets usually nume- 

 rous. Petioles produced into tendrils. Peduncles axillary. 



1. E. hir.tutum (Linn.): stem branching, diffuse; leaflets 8-20, linear, 

 tapering at the base, truncate or retuse at the apex, mucronulale; stipules 

 subulate, semi^agittate, entire or cleft; peduncles 3-G-tlowered, about the 

 length of the leaves ; calyx hairy, tiie subulate segments rather shorter than 

 the corolla ; legumes obiong, obliquely truncate, torulose, hirsute, 2-seeded, 

 drooping. — Torr. ! compend. p. 264; DC. prodr. 2. p. 366; Darlingt. ft. 

 Cesl. p. 426 ; Hook. fl. Bor.-Am. 1. p. 15S. Vicia Mitchelli, Ruf. ])rec. 

 decouv. p. ?/]; Ell. sk. 2. p. 224 ; DC. prodr. 2. p. 360. 



Thickets and banks of streams, New-York! Pennsylvania, S. Carolina: 

 probably introduced. May-Tune. — Stem 1-3 feet long, very slender, climb- 

 ing. Flowers very small, bluish-while. Seeds subglobose, somewhat com- 

 pressed. 



3. LATHYRUS, Linn.; DC. prodr. 2. p. 369. 



Calyx campanulate, 5-cleft ; the two upper segments somewhat shortest. 

 Style usually somewhat flattened, and dilated above, bent nearly at a right 

 angle with the ovary, pubescent or villous along the inside (next the free sta- 

 men). Legume oblong, several-seeded. — Mostly climbing herbs. Leaflets 

 1-several pairs. Petioles produced into tendrils. Peduncles axillary, 



§ 1. Annual : peduncles l-3-Jlo%oered. 



-X.1. L. pnsiUus (E\\.) : glabrous; stem branching from the base, winged; 



■^leaflets a single pair, linear-lanceolate, acute at each end, slightly rnucronate ; 

 stipules rather large, sagittate, slightly falcate ; peduncles elongated, 1-2- 

 flowered ; tendrils branching; segments of the calyx subulate-setaceous, 



'' nearly equal; legume elongated, slightly falcate, 10-15-seeded.— £//. sk. 2. 

 p. 223. 



S. Carolina, Elliott : common also in Arkansas, Nuttall ! Dr. Pitcher ! 

 Dr. Leavenworth! Texas and Western Louisiana, Dr. Leavcmcorth ! 

 April-May.— A small slender vine. Leaflets li-2 inches long. Stipules un- 

 equally sagittate, nearly an inch in length. 



§ 2, Perennial: peduncles several-Jiowered. 



-/-2. L. marilimns (Bigel.) : mostly glabrous; stem stout^ angled, at length 

 decumbent ; leaflets 4-6-pairs, oval or slightly obovate ; stipules cordate-has- 

 tate, nearly the size of the leaflets ; peduncles many- (6-10-) flowered, rather 

 shorter than the leaves ; segments of the calyx hairy on the margin, the two 

 upper ones triangular and shorter, the others lanceolate ; corolla purple ; le- 

 gumes oblong, at length rather turgid, slightly falcate. — Bigel. ! fl. Bost. ed. 

 2. p. 268. L. venosus, Brit. ft. gard. {ser. 2.) t. 37; Bigel. I. c. ed. 1. L. 

 Californicus, Doiisl. ; Lindt hot. reg. t. 1144, fide Hook. L. pisiformis, 



35 



