410 FABACEAE 



19. Lathyrus L. 



Leaflets 1 pair; stipules foliaceous; stems winged. I. L. pratensis. 



Leaflets 3-7 pairs. 

 Flowers purple. 



Stipules foliaceous; maritime. 2. L. maritimus. 



Stipules half-sagittate or small; inland species (except L. 

 palustris which usually inhabits salt marshes). 

 Leaflets ovate or oval, large; flowers 10-20. 3. L. venosus. 



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



Leaflets linear, or linear oblong; stem winged. 4. L. palustris. 



Leaflets oblong or oval; stem wingless. 5. L. myrtifolius. 



Flowers yellowish-white. 6. L. ochroleucus. 



1. L. pratensis L. In waste places: Me., N. H., Mass., Conn. 



and Ont. Naturalized from Europe. 

 Rare as a weed in N. Y. and Conn. 



2. L. maritimus (L.) Bigelow. On sea beaches: Arctic Am. to 



N. J., the Great Lakes, and on the Pacific coast. Also in 

 Europe and Asia. 



Very common along all the sea beaches and along N. Y. Bay and 

 L. I. Sound; decreasing in southern N. J. and not known south of 

 Atlantic Co. 



3. L. venosus Muhl. River shores and banks: N. J. and Pa. to 



Ind., Ga., La. and Kan. 



Known only from the drainage of the Delaware and Lehigh 

 Rivers in Hunterdon and Warren counties, N. J. and Lehigh and 

 Northampton counties, Pa. 



4. L. palustris L. In moist or wet places: Lab. to Alask., Mass., 



N. Y., S. Dak. and B. Col. Also in Europe and Asia. 



Apparently confined to the salt marshes on S. I. and L. I. and 

 coastal Conn., especially as to the form linear if olius. 



5. L. myrtifolius Muhl. In moist or wet grounds: N. B. to Man., 



N. Car. and Term. 



N. Y. Common on L. I. and S. I. and up the Hudson Valley to 

 West Point, unknown northward. 



N.J. From Bergen, Sussex, Union, Middlesex and Mercer counties, 

 southward along the Delaware to Gloucester Co.; not in the 

 pine-barrens. 



Pa. Monroe, Luzerne, Northampton, Lehigh, Berks and Dela- 

 ware counties. 

 Tertiary, o: Cretaceous, scattered: Older Formations, increasing 



northward. 149-204 days. Sea level-1,200 ft. 



