244 IRIDACEAE 



Stems mostly branched above and bearing 2 or more pedun- 

 culate spathes. 

 Tufts fibrous coated at the base; plant turning dark when 



dry. 4. S. arenicola. 



Tufts not fibrous coated at the base or but sparingly so. 

 Plant usually turning dark when dry; stem broadly 



winged; pedicels spreading or recurved. 5. 5. graminoides. 



Plant not turning dark when dry; pedicels not re- 

 curved. 6. 5. atlanticum. 



1. S. albidum Raf. Ont. to Wise, La., Ala. and N. Car.; and 



in Conn, and N. Y. as an introduced plant. 



Known in our range only from New London, Conn., and Mor- 

 risania, N. Y. City; obviously fugitive from the west. 



2. S. angustifolium Mill. Fields and roadsides and on hills: 



Newf. to N. J. and in the mountains to Va., west to Sask. 



and Col. 



Conn. Throughout, apparently decreasing southwestward. 



N. Y. Not recorded from S. I., occasional on L. I.; rare and local 



in Westchester Co., increasing and common northward. 

 N. J. Herman and Tuckerton along the coast and near New 



Brunswick, Middlesex Co.; rare in Hunterdon, Somerset and 



Union counties, increasing northward. 

 Pa. Luzerne, Monroe and Northampton counties. 



Tertiary, o: Cretaceous, rare or perhaps wanting: Older Forma- 

 tions, increasing northward. 117-190 days. Sea-level-2,300 ft. 



3. S. mucronatum Michx. In meadows and fields: Mass. and 



Mich, to N. J. and Va. 



Conn. Rare in the south and east, increasing northwestward, 



nowhere common. 

 N.J. Morris, Passaic and Union counties; not common; reported 



from Burlington, Gloucester and Atlantic counties, outside the 



pine-barrens. 

 Pa. Pike, Monroe, Northampton and Lehigh counties; reported 



also from Delaware and Chester counties. 



Tertiary, not on Beacon Hill, rare elsewhere: Cretaceous, rare: 

 Older Formations, not common. 149-189 days. 374-2,100 ft. 



4. S. arenicola Bicknell. In sandy soil on or near the coast: 



Mass., N. J. and N. Car. 



N. Y. Common on L. I. and S. I., not recorded elsewhere. 



N. J. Common in Middlesex, Monmouth, Ocean and Burlington 



counties, near the coast and west of the pine-barrens, not recorded 



elsewhere. 



