406 FLORA. 



Family i. NYMPHAEACEAE DC. 

 Water Lily Family. 



Aquatic perennial herbs, with horizontal rootstocks, floating, im- 

 mersed or rarely emersed leaves, and solitary axillary flowers. Sepals 

 3-5. Petals 5-00 . Stamens 5-00 ; anthers erect, the connective continu- 

 ous with the filament. Carpels 3-00 , distinct, united, or immersed in the 

 receptacle. Stigmas distinct, or united into a radiate or annular disk ; 

 ovules i -co, orthotropous. Fruit indehiscent. Seeds enclosed in pulpy 

 arils, or rarely naked ; cotyledons fleshy ; hypocotyl very short. 



Eight genera and about 33 species, of wide distribution in fresh-water lakes and 

 streams. 



Sepals and petals 3 ; stamens 6, hypogynous ; carpels distinct ; ovules few. 



Leaves dissected, excepting the small floating ones. i. Cabomba. 



Leaves peltate, entire, floating. 2. Brasenia. 



Sepals 4-6; petals numerous or several; carpels united; ovules numerous. 



Petals small or minute ; stamens hypogynous. 3. Nymphaea. 



Petals large, numerous ; stamens epigynous. 4. Castalia. 



Sepals 4-5; petals numerous ; carpels distinct, immersed in the receptacle ; ovule i. 



5. Nelumbo. 

 i. CABOMBA Aubl. 



Stems slender, coated with gelatinous matter, branching. Leaves petioled, 

 peltate, the floating ones small, entire; submerged ones opposite, palmately dis- 

 sected into capillary segments. Flowers small, white or yellow. Sepals and petals 

 3. Stamens 6; filaments slender; anthers extrorse. Carpels 2-4. Stigmas small, 

 terminal; ovules commonly 3, pendulous. Fruit coriaceous, indehiscent, about 3- 

 seeded. [Guiana name.] A genus of 2 or 3 species, natives of the warmer parts 

 of America. 



i. Cabomba Caroliniana A. Gray. CABOMBA. CAROLINA WATER-SHIELD. 

 (I. F. f. 1525.) Stem several feet long. Submerged leaves opposite or sometimes 

 verticillate, 2-5 cm. broad, repeatedly divided; floating ones linear-oblong, 1-2 cm. 

 long; flowers long-peduncled from the upper axils, I-I.5 cm. wide, white, or yellow 

 at base within; petals obovate; ripened carpels 3, separate, flask-shaped. In ponds 

 and slow streams, Mo. and S. 111. to N. Car., Fla. and Tex. May-Aug. 



2. BRASENIA Schreb. 



Plant covered with gelatinous matter. Leaves alternate, oval, entire, 5-10 cm. 

 long, long-petioled, floating. Flowers axillary, purple. Sepals and linear petals 3. 

 Stamens 12-18; filaments filiform. Carpels 4-18, separate. Ovules 2 or 3, pendulous 

 from the dorsal suture. Ripe carpels indehiscent, coriaceous, i-2-seeded. [Name 

 unexplained.] A monotypic genus of N. Am., Cuba, eastern and tropical Asia, 

 west tropical Africa, and Australia. 



i. Brasenia purpurea (Michx.) Casp. WATER-SHIELD or -TARGET. (I. F. f. 

 1526.) Rootstock slender. Leaves thick, rounded at each end; flowers 1-1.6 cm. 

 in diameter, on long stout peduncles; fruit oblong, 6-8 mm. long. In ponds and 

 slow streams, N. S. to Fla., Man., Tex., Mex., and at a few stations on the Pacific 

 Coast from Cal. to Wash. Summer. 



3. NYMPHAEA L. 



Herbs, with cylindric thick horizontal rootstocks, and large cordate leaves with 

 a deep sinus. Flowers showy, yellow, or sometimes purplish. Sepals 5 or 6, concave, 

 thick. Petals oo , small, stamen-like, hypogynous. Stamens oo , hypogynous. Car- 

 pels oo , many-ovuled, united into a compound pistil. Stigmas disciform, 7-24- 

 radiate. Fruit ovoid, naked. Seeds with endosperm. [Greek, water-nymph.] 

 About 8 species, natives of the north temperate zone. 



Leaves broadly ovate or oval. 



Leaves 1-3 dm. long ; stigma i2-24-rayed; petals truncate, fleshy, i. N. advena. 



Leaves 0.7-2.5 dm. long; stigma 9-1 2-rayed; petals spatulate, fleshy. 



2. N. hybrida. 



Leaveso.5-i dm. long; stigma 7-io-rayed; petals spatulate, thin. 3. N. Kalmiana. 

 Leaves narrowly ovate or ovate-lanceolate. 4. N. sagittaejolia. 



