The Flora of the Cayuga Lake Basin 99 



6. S. americanus Pers. (S. pungens of Cayuga Fl.) 

 Sandy shores and marshes ; frequent. June 20-Sept. 



Cayuta Lake; Lake Como (Locke Pond, D.) ; many places on the Ithaca flats and 

 along the shores of Cayuga Lake ; Montezuma Marshes ; Miller Bog, Spring Lake. 



Nearly throughout temperate N. A., including the Atlantic Coastal Plain. Found 

 also in S. A. and in Eu. 



Possibly influenced in its local occurrence by the brackish nature of the lake 

 marshes. 



7. S. validus Vahl. (S. lacustris, in part, of Cayuga Fl.) Bulrush. 



Marshes and lakes, in gravelly, silty, or muddy soils with little apparent relation to 

 lime content ; common. June 15-Aug. 10. 



Cayuta Lake; pond at Mecklenburg; Dryden Lake; Six Mile Creek; Fall Creek, 

 above Forest Home ; Townley Swamp ; shores of Cayuga Lake, in many places ; 

 Montezuma Marshes. 



Throughout temperate N. A., including the Coastal Plain. Found also in W. I. 



Specimens from the southwest corner of Cayuga Lake, and in gravel in Six Mile 

 Creek, are slender, with firm culms, as in the next species. 



8. S. acutus Muhl. (See Rhodora 22:55. 1920. S. occidentalis (Wats.) Chase.) 



Bulrush. 



Sandy, gravelly, or muddy shores, in brackish or calcareous regions ; frequent. 

 June 25-Aug. 



Confined chiefly to Cayuga Lake, the adjacent marshes, and the Ontario plain : 

 Spencer Lake ; s. w. corner of Cayuga Lake ; near Union Springs ; Canoga Marshes ; 

 Junius marl ponds. 



Newf . to B. C, southw. to Mass., cent. N. Y., Mo., Ariz., and Calif. ; frequent 

 along the coast. 



[S. heterochactus Chase has been found at Watkins, N. Y.] 



9. S. fluviatilis (Torr.) Gray. 



Marshes; locally common. June 20- Aug. 



Summit Marsh (D.) ; Inlet Marshes; Cayuga Marshes, very common. 

 N. B. to D. C, and locally through the Great Lakes region to Minn., Nebr., and 

 Kans. ; in the east, chiefly near the coast. 



Probably influenced in its local occurrence by brackish conditions. 



10. S. campestris Britton, var. paludosus (Nels.) Fernald. (S. maritimus of Cayuga 

 Fl.) 



Low sandy alluvial soil in the vicinity of salt springs ; rare. July-Aug. 



Salt springs on lake shore n. of Cayuga Lake Park; Salt Pond w. of Howland 

 Island; brackish meadow e. of Montezuma village; Montezuma Marshes near Salt 

 Creek (£>.). 



Gulf of St. Lawrence to N. J. along the coast, and inland from cent. N. Y. along 

 the Great Lakes to Minn., Oreg., Kans., Nev., and Mex. 



11. S. rubrotinctus Fernald. (5*. sylvaticus, var. digynus, of Cayuga Fl.) 

 Marshy, mucky, frequently alluvial places in fields and near the larger marshes, 



mostly in neutral or nearly neutral rich soils ; scarce. June-July. 



Inlet, near Ithaca-Newfield town line, near Lick Brook, and s. of Ithaca; swale 

 on South Hill; "marsh south of the boat-landing and north of Ithaca" (D.) ; near 

 Wood Mill station (D.) ; Cayuga Marshes (£>.). 



Lab. to Alberta, southw. to Conn., N. Y., the Great Lakes, Minn., Nev., and 

 Calif., including the Atlantic Coastal Plain. 



A comparison of eastern and western specimens seems to indicate that at present 

 it is unwise to unite S. rubrotinctus and S. microcarpus Presl. 



