35 



and flowers (fig. lOF); scape 4-5 ridged; plants of estuaries. 



1. E. parkeri 



1. Mature heads subglobose (fig. lOB), gray, appearing white due to 

 perianth parts and bractlets, 4-5 mm broad; bractlets distinctly 

 clavate-pubescent; involucral bracts reflexed in flowering and 

 fruiting heads and partly concealed by hairy flowers (fig. lOB); 

 scape (4-) 5-7 ridged; plant of fresh water. 

 2. E. septangulare 



1. Eriocaulon parkeri Robins. Fig. 10, Map 19 



Rare, in saline water along estuaries of Maine, Massachusetts, 

 and Connecticut. Range extends from the St. Lawrence River estuary 

 of Quebec to Maine and south along the coast to North Carolina. 



Rare and endangered plant Usts: New England, Maine, Massachusetts, 

 Connecticut. 



2. Eriocaulon septangulare With. Fig. 10, Map 20 



Extremely common in acid waters throughout New England. 

 Submersed plants are often noted with scapes of up to 20 dm or more in 

 length. Range extends from Newfoundland west to western Ontario, 

 south to Long Island, New York, New Jersey, Delaware, mountains of 

 North Carolina, northern Ohio, northern Indiana, Wisconsin, and 

 Minnesota. 



alkalinity: mean 9.6 mg/1; range 2.5-29.5 mg/1; (29) 

 pH: mean 6.9; range 5.8-8.3; (30) 



Selected References 



Krai, R. 1966. Eriocaulaceae of continental North America north of 

 Mexico. Sida 2: 285-332. 



Moldenke, H. N. 1937. Eriocaulaceae. N. Amer. Flora 19, pt. 1. 



PONTEDERIACEAE 



1. Stamens 6; flowers 2-lipped, in a dense, spicae inflorescence, blue- 

 violet; leaves cordate, hastate or narrow to broadly lanceolate (figs. 



U. 12). 

 Pontederia 



1. Stamens 3; flowers regular, solitary, yellow, blue, or rarely white; 

 leaves kidney-shaped (fig. 14) or linear (fig. 13). 



Heteranthera 



