Vou. II] PINK FAMILY. 41 
1. Scleranthus annuus I,. Knawel. German 
Knotgrass. (Fig. 1524.) 
Scleranthus annuus I,. Sp. Pl. 406. 1753. 
Much branched from long and rather tough roots, the 
branches prostrate or spreading, 3/-5’ long, roughish- 
puberulent or glabrous. Leaves subulate, 2’/-12’’ long, 
ciliate, light green, often recurved, their bases membran- 
ous at the junction; tube of the calyx 1o-angled, rather 
longer than the lobes, usually glabrous, the lobes some- 
what angled on the back and their margins incurved. 
In fields and waste places or on dry rocks, Quebee and On- 
tario to Pennsylvania and Florida, mostly near the coast. 
Naturalized from Europe. Very common in parts of the 
Eastern and Middle States. March-—Oct. 
Family 22. NYMPHAEACEAE DC. Propr. Med. Ed. 2, 119. 1816. 
WaTER LILY FAMILy. 
Aquatic perennial herbs, with horizontal rootstocks, floating, immersed or 
rarely emersed leaves, and solitary axillary flowers. Sepals 3-5. Petals 5-x. 
Stamens 5—~ ; anthers erect, the connective continuous with the filament. Car- 
pels 3-2. distinct, united, or immersed in the receptacle. Stigmas distinct, or 
united into a radiate or annular disk; ovules 1-~, orthotropous. Fruit inde- 
hiscent, separate or coherent. Seeds enclosed in pulpy arils, or rarely naked; 
cotyledons fleshy; hypocotyl very short. 
; Eight genera and about 33 species, of wide geographic 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. . Cabomba. 
Leaves peltate, entire, floating. 2. Brasenia. 
Sepals 4-6; petals numerous or several; carpels united; ovules numerous. 
Hi 
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 1. 5. elumbo. 
1. CABOMBA Aubl. Pl. Guian. 1: 321.1775. 
Stems slender, coated with gelatinous matter, branching. - Leaves petioled, peltate, the 
floating ones small, entire; submerged ones opposite, palmately dissected into numerous 
capillary segments. Flowers small, white or yellow. Sepals and petals 3. Stamens 6; fila- 
ments 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 possibly 3 species, natives of the warmer parts 
of America. 
1. Cabomba Caroliniana A. Gray. Cabomba. 
Carolina Water-shield. (Fig. 1525.) 
Cabomba Caroliniana A. Gray, Ann, Lyc. N. ¥. 4:47. 1837. 
Stem several feet long, branching. Submerged leaves op- 
posite or sometimes verticillate, petioled, 1/-2’ broad, cen- 
trally peltate, repeatedly divided; floating ones alternate or 
opposite, linear-oblong, 6’’-10’’ long; flowers long-peduncled 
from the upper axils, 6’’-8’’ wide, white, or yellow at base 
within; petals obovate; ripened carpels 3, separate, flask- 
shaped. 
In ponds and slow streams, southern Illinois to North Carolina, 
south to Florida and Texas. May-Aug. 
