NYMPHAEACEAE 315 



Petals very small and stamen-like, the stamens inserted under 



the ovary. 2. Nymphaea. 



Petals large, numerous; stamens epigynous. 3. Castalia. 



Carpels few-several, separately immersed in the obeonic receptacle; 



ovules solitary. 4- Nelumbo. 



i. Brasenia Schreb. 



1. B. Schreberi Gmel. (B. purpurea (Michx.) Casp.). In ponds 



and slow streams: N. S. to Fla., Man., Tex., Mex. and rarely 

 on the Pacific coast from Cal. to Wash. 



Throughout the range and in some localities exceedingly common, 

 usually decreasing northward and at greater elevations. 



2. Nymphaea [Tourn.] L. 



Leaves 1-3 dm. long; stigma 12-24 rayed; petals truncate, fleshy. I. N. advena. 

 Leaves 0.7-2. 5 dm. long; stigma 9-12 rayed; petals spatulate, fleshy. 2. N. rubrodisca. 

 Leaves 0.5-1 dm. long; stigma 7-10 rayed; petals spatulate, thin. 3. N. microphylla. 



i. N. advena Soland. In ponds and slow streams: Labrador to 

 the Rocky Mts., Fla., Tex. and Utah. 



Common throughout the range in some of its forms, the variety 

 variegata, with floating leaves, being perhaps the commonest of all. 

 It has been maintained by some as TV. variegata (Engelm.) G. S. 

 Miller. A plant confined to the pine-barrens, with smaller flowers 

 and fruit than the type, has recently been described as N. fraterna 

 Miller and Standley. 



2. N. rubrodisca (Morong) Greene (N. hybrida Peck). In 



ponds and slow streams: Vt. to Ont., N. Y., Pa. and Mich. 

 Known in our range, only from ponds and lakes north of the 

 terminal moraine; frequent in the Bronx River. Perhaps a hybrid 

 between the preceding and the following. 



3. N. microphylla Pers. (N. Kalmiana (Michx.) Sims.). In 



ponds and slow streams: Newf. to N. Y., Pa., Minn, and 

 Saskatch. 



Known in our range only from ponds and lakes north of the 

 moraine. 



3. Castalia Salisb. 



Flowers 0.7-1.5 dm. broad, fragrant; leaves orbicular, purplish beneath. 1. C. odorata. 

 Flowers 1-2.5 dm. broad, not fragrant ; leaves orbicular, green both sides. 2. C. tuberosa. 



i. C. odorata (Dryand) Woodv. & Wood. In ponds and slow 

 streams: Newf. to Manit., Fla. and Tex. 



Common throughout the area either in its typical form or, in the 

 south, replaced by the varieties rosea and minor. 



