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 ∞, small, stamen-like, hypogynous. Stamens ∞, hypogynous. Carpels ∞, many-ovuled, united into a compound pistil. Stigmas disciform, 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 12-24-rayed; petals truncate, fleshy.

1.

N. advena.

Leaves 2'-4' long; stigma 7-10-rayed; petals spatulate, thin.

2.

N. microphylla.

Leaves narrowly ovate or ovate-lanceolate.

3.

N. sagittaefolia.

1 Nymphaea Tourn L Sp Pl 510 1753 Nuphar Sibth 181

1. Nymphaea ┴dvena Soland. Large Yellow Pond Lily. Kelp

Fig. 1839

Nymphaea advena Soland. in Ait. Hort. Kew. 2: 226.

1789. Nuphar advena R. Br. in Ait. Hort. Kew. Ed. 2, 3:

295. 1811. N. advena minor Morong, Bot. Gaz. 11: 167. 1886.

Floating and emersed leaves 5'-12' long, 5'-9' broad, ovate or orbicular-oval, thick, the sinus 2-5' deep, generally open; submerged leaves, when present, thin-membranous, nearly orbicular, otherwise similar; petioles, peduncles and lower surfaces of the leaves often pubescent; flowers 1 1/2'-3 1/2' in diameter, depressed-globose, yellow or tinged with purple; sepals 6, oblong, about 1 1/2 long; petals fleshy, oblong, truncate, 4"-S" long; stamens in 5-7 rows; anthers about the length of the filaments; stigmatic disc undulate, yellow, or pale red, rays 12-24; fruit ovoid, not deeply constricted into a neck, 1 1/2'-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. Bonnets. 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 N. advena and N. microphylla, Nymphaea fratÚrna 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 var. Kalmiana Michx. Fl. Bor.

Am. 1: 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. pl. 1243. 1809.

Leaves 2'-4' long, 1'-3' broad, the sinus open or closed, commonly more or less pubescent beneath; submerged ones always present, membranous, orbicular, larger; flowers 1' 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"-3" 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.

2 Nymphaea Microphylla Pers Small Yellow Pond Lily 182

3. Nymphaea Sagittaef˛lia Walt. Arrow-Leaved Pond Lily

Fig. 1841

Nymphaea sagittaefolia Walt. Fl. Car. 155. 1788.

Nuphar sagittaefolia Pursh, Fl. Am. Sept. 370. 1814.

Floating leaves narrowly ovate or ovate-lanceolate, glabrous, obtuse, 8'-15' long, 2'-3' wide; submerged ones numerous, similar, but membranous and commonly larger; flowers yellow, about 1' broad; sepals 5; petals broadened above, 3" long; stamens in 4 or 5 rows, the filaments about equalling the anthers; stigmatic disk crenate, 11-15-rayed; fruit ovoid, not constricted into a neck, about 1' long.

In ponds and streams, eastern North Carolina and South Carolina. Recorded as occurring in ponds (now drained) in southern Indiana and Illinois. Plants of the Gulf States formerly referred to this species prove to be distinct. Alligator-bonnets. Summer.

3 Nymphaea Sagittaef Lia Walt Arrow Leaved Pond Li 183