Genus 41. 



PEA FAMILY. 



4'3 



Leaflets 2-6 pairs. 



Flowers purple. j ^^ ^ . t 1 



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

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

 Plants climbing or trailing ; stipules present ; pod sessile. 

 Leaflets ovate or oval, large; flowers lo-^o. 

 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. 



Pisitin niaritiiitum L. Sp. PI. 7:27. I753. 



Lalhynis 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' long; 

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

 obovate, obtusish and mucronulate at the apex, mainly 

 narrowed at the base, somew hat larger than the stipules ; 

 tendrils branched ; peduncles somewhat shorter than the 

 leaves; flowers 6-10, 9"-i2" long, purple; calyx-teeth often 

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

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



Sea-beaches, Xew 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. vcnosus. 



3. L. palustris. 



4. L. myrtifolius. 



5. L. decaphyllus. 



6. L. ornatus. 



7. L. ochrolciicus. 



8. L. pratensis, 



9. L. latifo/ius. 

 10. L. pusillus. 



2. Lathyrus venosus .Muhl. Veiny Pea. 

 Fig. 2625. 



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



Finely pubescent or glabrous, perennial, ascending, 

 cliinljing 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, rtiostly 

 rounded at the base, I'-s' long; tendrils branched; 

 peduncles shorter than the leaves ; flowers purple, 

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

 sessile, glabrous, veined, ii'-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. 



