170 CYPERACEAE 



Achene transversely wrinkled. 



Leaves flat; spikelets nearly or quite sessile. 13. R. cymosa. 



Leaves involute; spikelets short pedicelled. 14. R. Torreyana. 



Leaves and stems filiform; spikelets distinctly 



pedicelled. 15- R- rariflora. 



1. R. corniculata (Lam.) A. Gray. {R. macrostachya Torr.) In 



swamps: Mass. to Fla., west to Ohio, Mo., Kan. and Tex. 

 Conn. Rare and scattered along the coast, decreasing and perhaps 



wanting inland. 

 N. Y. Known only from Wading River and Lynbrook, L. I. 

 N. J. Lakehurst Ocean Co., Camden Co., increasing southward, 



Tertiary, common: Cretaceous, less common: Older Formations, 

 rare and scattered along the coast in Conn. 189-220 days. About 

 sea level. 



2. R. pallida M. A. Curtis (R. Curtisii Steud.). In bogs: N. J. 



to N. Car. 



N.J. The coastal plain from Burlington and Ocean counties 



southward; common in the pine-barrens, local elsewhere. 



Tertiary, common: Cretaceous, common: Older Formations, O. 

 159-220 days. About sea level. 



3. R. oligantha A. Gray. In wet soil: N. J. to Fla. and Texas. 



Very rare in the pine-barrens near the west branch of Wading 

 River, in Burlington Co., N. J.; unknown elsewhere. 



4. R. alba (L.) Vahl. In bogs: Newf. to Alaska, south to Fla., 



Ky., Minn., Idaho and Cal. Also in northern Eu. and Asia. 

 Throughout the range; abundant in the pine-barrens. 



5. R. capillacea Torr. In bogs: N. B. to Ont., Minn., N. J., 



Pa., Ind. and Mo. 



Known in our range only from near White Pond, Warren Co., 

 N. J.; from White Pond, Sussex Co., N. J., and Salisbury, Conn. 



6. R. Knieskernii Carey. In pine-barrens: N. J. to Va. 



Known only from the pine-barrens ; on the Beacon Hill formation. 



7. R. glomerata(L.) Vahl. (R. glomerata leptocarpa Chapm.). 



In moist soil: N. B. to Ont., Mich., Ark., Fla. and Tex. 



Scattered throughout the range, more common in the south and 

 less common in the north than elsewhere. 



8. R. axillaris (Lam.) Britton (R. axillaris microcephala Britton). 



In swamps: L. I. to Fla. and La. near the coast; also in Cuba. 



