NYMPHAEACEAE. 



VOL. II. 



Ovules very numerous on the walls of the ovary. Fruit a leathery several-seeded 

 berry. Seeds often shining, with the embryo enclosed in a sac at the base of the 

 fleshy endosperm. 



Five genera and about 45 species, widely distributed in fresh water. 



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



Petals large, numerous ; stamens epigynous. 2 Castalia. 



i. NYMPHAEA [Tourn.] L. Sp. PL 510. 1753. 

 [XUPHAR Sibth. & Smith, Fl. Grace. Prodr. i : 391 1806.] 



Aquatic herbs, with cylindric thick horizontal rootstocks, and large cordate leaves with 

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

 Petals oo, small, stamen-like, hypogynous. Stamens oo f hypogynous. Carpels =o, many- 

 ovuled, united into a compound pistil. Stigmas disci form, 8-24-radiate. Fruit ovoid, naked. 

 Seeds with endosperm. [Greek, water-nymph.] 



A genus of about 8 species, natives of the north temperate zone. Type species: Nymphaea 

 lutea L. 

 Leaves broadly ovate or oval. 



Leaves 5 '-12' long; stigma i2-24-rayed; petals truncate, fleshy. i, N. advena. 



Leaves ^'-4' long; stigma 7-io-rayed; petals spatulate, thin. 2. N.microphyila. 



Leaves narrowly ovate or ovate-lanceolate. 3. N. sagittaefolia. 



/%X ^ ^^ I - Nymphaea advena Soland. Large 



Yellow Pond Lily. Kelp. Fig. 1839. 



Nymphaea advena Soland. in Ait. Hort. Kew. z : 226. 



1789. 

 Nuphar advena R. Br. in Ait. Hort. Kew. Ed. 2, 3 : 



295. 1811. 



N. advena minor Morong, Bot. Gaz. n : 167. 1886. 

 Floating and emersed leaves $'-12' long, s'-p' 

 broad, ovate or orbicular-oval, thick, the sinus 

 2'-$' deep, generally open ; submerged leaves, 

 when present, thin-membranous, nearly orbicu- 

 lar, otherwise similar; petioles, peduncles and 

 lower surfaces of the leaves often pubescent; 

 flowers i'-3i' in diameter, depressed-globose, 

 yellow or tinged with purple; sepals 6, oblong, 

 about li" long; petals fleshy, oblong, truncate, 

 4"-S" long; stamens in 5-7 rows; anthers about 

 the length of the filaments ; stigmatic disc undu- 

 late, yellow, or pale red, rays 12-24; fruit ovoid, 

 not deeply constricted into a neck, \\'-2.' long, 

 about i' thick. 



In ponds and slow streams, Labrador and Nova 

 Scotia to the Rocky Mountains, south to Florida, 

 Texas and Utah. April-Sept. Beaver-root. Bon- 

 nets. Cow-, frog-, dog-, horse- or beaver-lily. Spatter-dock. Apparently consists of several races, 

 or, as here described, includes more than one species. 



Nymphaea rubrodisca (Morong) Greene, differing by fewer stigma-rays and spatulate petals, 

 admitted as a species in our first edition, is probably a hybrid between AT. advena and N. microphylla. 

 Nymphaea fraterna Miller & Standley, recently described from the pine-barrens of New Jersey, 

 has smaller flowers and fruit than N. advena. 



2. Nymphaea microphylla Pers. Small 



Yellow Pond Lily. Fig. 1840. 

 Nymphaea lutea van Kalmiana Michx. Fl. Bor. 



Am. i : 311. 1803. 



Nymphaea microphylla Pers. Syn. 2: 63. 1807.- 

 Nuphar Kalmianum R. Br. in Ait. Hort. Kew. 



Ed. 2, 3: 295. 1811. 

 N. Kalmiana Sims, Bot. Mag. pi. 1243. 1809. 



Leaves 2'-4' long, i'-3' broad, the sinus 

 open or closed, commonly more or less 

 pubescent beneath; submerged ones always 

 present, membranous, orbicular, larger ; flow- 

 ers i' in diameter or less, yellow ; sepals 5 ; 

 petals thin and delicate, 2" long; stamens in 

 3 or 4 rows, narrowly linear, the anther one- 

 fourth the length of the filaments; stigmatic 

 disk crenate or stellate, 2"-$" broad, 6-7- 

 rayed, dark red; fruit ovoid, 6"-7" long, 

 with a short neck. 



In ponds and slow streams, Newfoundland to 

 southern New York and Pennsylvania. Summer, 

 flowering later than the preceding. 



