GENUS 41. 



PEA FAMILY. 



Leaflets 2-6 pairs. 

 Flowers purple. 



Stipules broad, foliaceous ; plant of the seashore and the Great Lakes. 

 Stipules half-sagittate or small, or wanting ; inland plants. 

 Plants climbing or trailing ; stipules present ; pod sessile. 

 Leaflets ovate or oval, large; flowers 10-20. 

 Leaflets linear, oblong or oval, smaller ; flowers 2-6. 

 Leaflets linear or linear-oblong ; stem winged. 

 Leaflets oblong or oval ; stem wingless. 



Plants mainly erect ; stipules often wanting ; pod stipitate. 

 Leaflets lanceolate or oblong. 

 Leaflets linear. 



Flowers yellowish-white ; stipules foliaceous. 

 Leaflets i pair. 



Perennial introduced species. 



Flowers yellow ; stems wingless. 

 Flowers purple ; stems broadly winged. 

 Annual ; flowers purple ; native species. 



i. Lathyrus maritimus (L.) Bigel. Beach Pea. 

 Sea or Seaside Pea. Fig. 2624. 



Pisum maritimum L. Sp. PI. 727. 1753. 



Lathyrus maritimus Bigel. Fl. Bost. Ed. 2, 268. 1824. 



Perennial, glabrous or nearly so, stout, somewhat fleshy, 

 slightly glaucous; stems angled, decumbent, i-2 long. 

 Stipules broad foliaceous, ovate, hastate, acute, i'-2 r long; 

 leaves nearly sessile; leaflets 3-6 pairs, oblong, oval or 

 obovate, obtusish and mucronulate at the apex, mainly 

 narrowed at the base, somewhat larger than the stipules; 

 tendrils branched; peduncles somewhat shorter than the 

 leaves ; flowers 6-10, g"-i2 /f long, purple ; calyx-teeth often 

 ciliate ; pod sessile, linear-oblong, nearly glabrous, veined, 

 il'-3' long, 4"-5" wide 



Sea-beaches, New Jersey to arctic America, shores of the 

 Great Lakes, Oneida Lake and on the Pacific Coast. Also in 

 northern Europe and Asia. May-Aug. Sometimes blooming 

 again late in autumn. Also called sea-side everlasting pea. 



i. L. maritimus. 



2. L. venosus. 



3. L. palustris. 



4. L. myrtifoliits. 



5. L. decaphyllus. 



6. L. ornatns. 



j. L. ochroleucus. 



8. L.pratensis. 



9. L. latifoliits. 

 10. L. pusilliis. 



2. Lathyrus venosus Muhl. Veiny Pea. 

 Fig. 2625. 



Lathyrus venosus Muhl. ; Willd. Sp. PI. 3 : 1092. 1803. 



Finely pubescent or glabrous, perennial, ascending, 

 climbing or decumbent, 2-3 long. Stems strongly 

 4-angled; stipules lanceolate, half-sagittate, acute or 

 acuminate, 4"-i2" long, much smaller than the leaf- 

 lets ; leaves petioled : leaflets 4-7 pairs, ovate or oval, 

 obtuse or acutish and mucronulate at the apex, mostly 

 rounded at the base, i'-2' long; tendrils branched; 

 peduncles shorter than the leaves; flowers purple, 

 6"-8" long; calyx pubescent or glabrous; pod linear, 

 sessile, glabrous, veined, i'-3' long, about 3" wide. 



River shores and banks, western New Jersey and Penn- 

 sylvania to Ontario, Indiana, Saskatchewan, Georgia, 

 Louisiana and Arkansas. Ascends to 3500 feet in Vir- 

 ginia. Leaflets often strongly reticulated. May-July. 



