FABACEAE. 



VOL. II. 



3. Lathyrus palustris L. Marsh Vetchling. Wild 

 Pea. Fig. 2626. 



Lathyrus palustris L. Sp. PI. 733. 1753. 



L. palustris linearifolius Ser in DC. Prodr. 2: 371. 1825. 



Perennial, glabrous or somewhat pubescent ; stems an- 

 gled and usually winged, slender, i-3 long; stipules half- 

 sagittate, lanceolate, linear or ovate-lanceolate, 5"-io" long, 

 ii"-2i" wide; leaflets 2-4 pairs, lanceolate, oblong, linear 

 or linear-oblong, acute or obtusish and mucronate at the 

 apex, narrowed or rounded at the base, I'zb' long, 2 "-5" 

 wide ; tendrils branched ; peduncles generally about equal- 

 ling the leaves, 2-8-flowered ; flowers purple, 5"-/" long ; 

 pod linear, sessile, slightly pubescent, or glabrous, iJ'-2i' 

 long, about 3" wide. 



In moist or wet grounds, Newfoundland to Alaska, Massa- 

 chusetts, New York, South Dakota and British Columbia. Also 

 in Europe and Asia. May-Aug. 



4> Lathyrus myrtifolius Muhl. Myrtle-leaved 

 Marsh Pea. Fig. 2627. 



Lathyrus myrtifolius Muhl.; Willd. Sp. PI. 3: 1091. 1803. 

 L. palustris var. myrtifolius A. Gray, Man. Ed. 2, 104. 1856. 

 L. myrtifolius macranthus White, Bull Torr. Club 21 : 448. 1894. 



Perennial, usually quite glabrous sometimes 

 pubescent; stems slender, angled, not winged, 

 i-3 long, weak. Stipules obliquely ovate, or 

 half-sagittate, 6"-i2" long, often 4"-6" wide 

 and toothed ; leaflets 2-4 pairs, mostly 3 pairs, 

 oval, oval-oblong or ovate, mucronate and 

 acute or obtuse at the apex, narrowed at the 

 base. 9"-2' long, 3"-7" wide, rather thin ; ten- 

 drils branched, peduncles equalling the leaves, 

 or shorter, 3-9-60 wercd ; flowers purple or pur- 

 plish, similar to those of the preceding species ; 

 pod linear, glabrous, sessile, i'-2 long, 3!" 

 wide or less. 



In moist or wet grounds, New Brunswick to 

 Manitoba, south to North Carolina and Tennessee. 

 May- July. 



5. Lathyrus decaphyllus Pursh. 

 Prairie Vetchling. Fig. 2628. 



L. decaphyllus Pursh, Fl. Am. Sept. 471. 1814. 

 Lathyrus polymorphic Nutt. Gen. 2: 96. 1818. 



Perennial, erect or ascending, glabrous, 

 or finely pubescent, 6'-i8' high. Stems 

 angled ; stipules half-sagittate, acuminate, 

 4"-i2" long, i "-3" wide; leaves petioled; 

 leaflets 3-7 pairs, obtuse or acute and mu- 

 cronulate at the apex, narrowed at the 

 base, thick, conspicuously reticulated, \'-2.\' 

 long, 3"-8" wide ; stipules when present 

 branched, but often wanting; peduncles 

 usually shorter than the leaves; flowers 

 purple, i'-ii' long, showy; pod linear, stipi- 

 tate ; seeds with a narrow stalk and short 

 hilum. 



Kansas (?), Idaho and Colorado to Arizona and New Mexico. March-July. Everlasting-pea. 



