1. Brasenia schreberi Gmel. Fig. 2, Map 2 



Common in slow moving and standing waters throughout New 

 England. Range extends from Prince Edward Island west to southern 

 Quebec, southern Ontario, and Minnesota, south to Florida and 

 Texas; southern British Columbia to Oregon; Mexico and Central 

 America. 



alkalinity: mean 15.9 mg/1; range 2.5-111.5 mg/1; (53) 



pH: mean 6.6; range 5.7-9.5; (51) 



NYMPHAEACEAE 



1. Flowers white to pinkish, broadly open (figs. 3,4); sepals 4, greenish; 

 petals numerous, conspicuous, elliptic to spatulate to oblanceolate; 

 stigmas radiate from globose ovary summit extending into linear, 

 incurved sterile appendages; leaves orbicular, lobes with recurved 

 tips (fig. 3A,D), venation essentially palmate (fig. 3A,D). 

 1. Nymphaea 



1. Flowers yellow, sometimes greenish or reddish, subglobose (fig. 7); 

 sepals 5-6(-9); petals numerous, strap-like, usually shorter than, 

 but resembling the stamens, recurved; stigmas sessile, radiate on a 

 disc (fig. 7), appendages lacking; leaves orbicular-reniform, ovate 

 to oblong, lobes rounded at tip (figs. 5,6), venation essentially pin- 

 nate (fig. 5B,D). 

 2. Nuphar 



Nymphaea (Water-lily, Pond-lily) 



Perennial, arising from rhizomes; leaves submersed, floating 

 and/or emergent, deeply cleft, long-petioled; flowers showy; sepals 4, 

 greenish; petals numerous, white to pink, the inner ones usually tran- 

 sitional to stamens; fruit a leathery berry; seeds arillate, maturing 

 underwater. 



Key to Species 



1. Leaves orbicular to ovate in outline, 7-30 cm wide, sinus typically 

 narrow or closed (fig. 3A,D); flowers 7-30 cm broad, petals 17-32. 

 2. Petioles green, not striped; lower surface of leaf red to purple 

 (rarely green); petals elliptic, subacute at tip (fig. 3B,C). 



1 . N. odorata 



2. Petioles green with brown-purple stripes; lower surface of leaf 

 green (rarely faint red-purple); petals spatulate to oblanceolate, 

 rounded at tip (fig. 3E.F). 

 2. N. tuberosa 



