Heteranthera PONTEDERIACEAE— JUNCACEAE Juncus 



H. dubia (Jacq.) MacM. Water Star-grass. 



Infrequent, rooting on bottoms of streams in the Piedmont area. 

 Aug., early Sept. 



JUNCACEAE (Rush Family) 



Juncus L. Rush 



|-V J. bufonius L. Toad Rush. 



Frequent throughout our area, in open, usually moist, clay or 

 sandy soil. May to July. (*CUa>'7 Ca>--^- '' 



z l.i J* Gerardi Loisel. Black Grass. 



Common in salt marshes of the Coastal Plain. June, July. 

 An important constituent of "marsh hay." ^,<.yv-i-*/ CP < 



J. tenuis Willd. See Fernald: Rhodora 47, 117 sqq. 1945. 



Common in fields and open woods, throughout, preferring foot- 

 paths and cart tracks; also on coastal sand dunes. Mid-May to 

 July. 



J. platyphyllus (Wiegand) Fernald. (J. tenuis var. platyphyllus 

 (Wiegand) Cory.) 

 Infrequent; tidal marshes, meadows and thickets of the Coastal 

 Plain. Mid-June, July. 



J. secundus Beauv. 



Infrequent, on serpentine soil; occasional in thickets and open 

 sandy places of the Coastal Plain. June, July. 



\^ J. dichotomus Ell. 



Common throughout the Coastal Plain, in sandy woods and on 

 dunes along the seashore. June, July. v^^Jl 1.^-1 ( 



J. coriaceus Mack. (/. setaceus of Gray's Man., ed. 7.) 



Infrequent; salt marshes, borders of fresh- water ponds, and low 

 pine woods, Sussex County and southward. June to Oct. 



VA J. effusus L. var. solutus Fernald & Wiegand. 



Common in swamps and meadows. Piedmont, and Coastal 

 Plain southward at least to Worcester County. June, July. 



Var. costulatus Fernald. ^'*' 'K,/rf' 



Rare, in ditches and pond borders of the Coastal Plain: 

 Rehoboth (S), True, 19 July 1926 (P); near Georgetown (S), 



[78] 



