220 JUNCACEAE 



Common throughout the range. A narrow lanceolate-leaved 

 form occurs sparingly with the typical plant, particularly in northern 

 N.J. 



2. Heteranthera R. & P. 



Leaves mostly reniform, sometimes cordate-ovate. I. H. reniformis. 



Leaves narrowly linear, grass-like. 2. H. dubia. 



1. H. reniformis R. & P. In mud or shallow water: Conn, to 



N. J., Neb. and Kan., south to La. Also in South and 



Central America. 



Conn. The southeastern part of the state. 



N. Y. In the Hudson from Dutchess Co. northward. 



N. J. Bergen, Morris and Hunterdon counties southwestward to 



Salem Co., apparently not in the pine-barrens. 

 Pa. Northampton, Berks, Bucks, Chester and Delaware counties. 



2. H. dubia (Jacq.) MacM. In still water: Que. to Ore., Fla. 



and Mex. Also in Cuba. 



Conn. Rare or local over most of the state. 



N. Y. Westchester Co., increasing northward. Apparently 



wanting on L. I. and S. I. 

 N. J. Apparently throughout the state, except in the pine-barrens 



and east and south of them. 

 Pa. Northampton, Bucks, Philadelphia, Chester and Delaware 



counties. 



JUNCACEAE 



Leaf sheaths open; capsule I- or 3-celled, many-seeded; placenta 



parietal or axial. 1. J UNCUS. 



Leaf sheaths closed; capsule i-cellcd, 3-seeded, its placenta basal. 2. Juncoides. 



i. Juncus L. 



Inflorescence lateral, the leaves above it terete. 

 Flowers prophyllate. 



Perianth parts green or straw colored. 



Perianth parts equalling the capsule, acute. 



Stamens 3; leaf of inflorescence much shorter 



than the stem. 1. J. effusus. 



Stamens 6; leaf of the inflorescence about equal- 

 ling the stem or longer. 2. /. filiformis. 

 Perianth parts \<i as long as the capsule, the inner 

 obtuse. 3. /. gymnocarpus. 

 Perianth parts brown or with a brown band down each 



side of the midvein. 4. J. balticus. 



Flowers eprophyllate. 5. /. marilimus. 



Inflorescence terminal, or if lateral the leaves above it not terete. 



