Fig. 445: Cabomba caroliniana . a, submersed leaves, floating leaves and flowers, 

 X 1/2; b, rooting base of stem, x i/o", c, submersed leaf, x 1; d, floating leaf, x 3; e, flower, 

 X I; f, petal, x I1/2; g, sepal, x IM; h, young carpels, x 7; i, mature seed, x 5. (Courtesy 

 of R. K. Godfrey). 



In lakes, ponds and quiet streams mainly in s.e. Okla. {Waterfall) and e. Tex., 

 Apr.-July; from Fla. to Tex., n. to Va., s. 111. and e. Mo., somewhat naturalized 

 farther n. 



4. Brasenia Schreb. 



A monotypic genus of wide distribution. 

 1. Brasenia Schreberi J. F. Gmel. Purple wen-dock, water-shield. Fig. 446. 



Rootstock slender, creeping in mud; stems slender; leaves alternate, long- 

 petioled, centrally peltate, floating, broadly oval to suborbicular, rounded at both 

 ends, entire or rarely very shallowly crenate, thickish, smooth on upper surface, 

 gelatinous on lower surface, to 10 cm. long; flowers axillary, small, dull-purple, 

 emergent; sepals and petals 3 or 4 each, linear-oblong, 1-1.5 cm. long; stamens 

 18 to 36, the filaments filiform, the anthers slightly introrse; pistils 4 to 18, 

 separate, the stigmas linear; fruits clavate, coriaceous, indehiscent, 6-8 mm. long. 

 B. purpurea Casp. 



In lakes, ponds and slow streams in e. Okla. (Atoka, Pushmataha and Sequoyah 

 cos.) and e. Tex., Apr .-May; from Fla. to Tex., n. to P.E.I., s. Que., s. Ont. and 

 Minn., w. to s. B.C., Ore. and Calif. 



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