456 NYMPHAEACEAE 
to elliptic or elliptic-oblanceolate, concave, obtuse : appendages of the anthers 4-7 mm. 
long : fruit turbinate-hemispheric or nearly hemispheric, becoming hard, 7-10 cm. broad : 
nuts subglobose, 10-12 mm. in diameter. 
In ponds and slow streams, locally, Ontario to Michigan, Florida and Texas. Summer. 
FAMILYS. NYMPHAEACEAE DC. WATER LILY FAMILY. 
Perennial acaulescent herbs, with more or less elongated often tuber-bearing 
rootstocks. Leaves alternate: blades leathery or those of submersed leaves 
membranous and delicate, all with a sinus at the base, petioled. Flowers per- 
fect, terminating elongated scapes. Sepals 4—6, often green. Petals numerous, 
usually passing into staminodia or stamens, decaying. Androecium of numer- 
ous stamens. Anthers introrse, adnate. Gynoecium of several carpels more 
or less united into a compound ovary. Stigmas united into a disk with radiat- 
ing stigmatic lines. Ovules very numerous on the walls of the ovary. Fruit a 
leathery many-seeded berry. Seeds often shining, with the embryo enclosed in 
a sac at the base of the fleshy endosperm. 
Petals small, filament-like : stamens hypogynous. 1. NYMPHAEA. 
Petals as large as the sepals: stamens epigynous. 2. CASTALIA. 
1 NYMPHABA L. 
Aquatic herbs, perennial by large horizontal rootstocks. Leaves numerous: blades 
long-petioled, with a sinus at the base; those erect or floating, leathery ; those submersed 
membranous. Flowers yellow, erect at the ends of the elongated scapes. Sepals 5-6, 
leathery, concave. Petals 10-20, small, filament-like. Filaments flattened. Carpels sev- 
eral, united into a several-celled ovary: stigmas forming an 8-24-radiate disk. Ovules 
numerous, pendulous. Fruit leathery. [Nuphar Sibth. & Smith.] Sparrer Dock. 
BONNETS. 
Leaf-blades elongated, fully 5 times as long as the sinuses. 1. N. sagittaefolia. 
Leaf-blades ovate, oval or suborbicular, less than 4 times as long as the sinuses. 
Leaf-blades manifestly longer than broad, ovate or oval or somewhat oblong. 
Stigmatic disk with lines terminating remote from the edge: leaf-blades ob- 
. long-ovate. : 2. N. macrophylla. 
Stigmatic disk with lines terminating near the edge: leaf-bladesovate or oval. 3. N. advena. 
Leaf-blades suborbicular. 4. N. orbiculata. 
1. Nymphaea sagittaefòlia Walt. Perennial by thick rootstocks, the foliage gla- 
brous. Leaves of two kinds, the submerged numerous, with membranous, crisped, lanceo- 
late or ovate-lanceolate blades : emersed leaves leathery ; blades narrowly ovate to almost 
linear, 1.5-4 dm. long, undulate, obtuse, the sinus open: flowers yellow, 2.5-3 cm. in di- 
ameter: sepals 5: stamens in 4-5 rows: stigmatic disk with 11-15 lines, crenate : berry 
ovoid, about 2.5 cm. long, constricted into a neck. 
In ponds and slow streams, southern Indiana and Illinois to North Carolina and Florida. Spring 
and summer. 
2. Nymphaea macrophylla Small. Perennial from very thick horizontal root- 
stocks, bright green. Foliage glabrous or nearly so: emersed leaves leathery ; petioles 
short, sometimes sparingly pubescent ; blades oblong-ovate, 3-8 dm. long, obtuse, notched 
at the apex, 1-2.5 dm. broad at the middle, the sinus V-shaped, or rarely closed : flowers 
erect, subglobose, 3-5 em. in diameter: sepals leathery, 2.5-3 em. long, concave : petals 
yellow, slightly longer than the sepals : stamens numerous: stigmatic disk becoming 3-3.5 
em. broad, often deeply crenate, the coarse stigmatic lines not approaching the edge: 
7z ovoid, 3-4 cm. high, coarsely ribbed above the middle : seeds subglobose, 5-6 mm. 
in diameter. 
In ponds, creeks and slow streams, Florida to Louisiana. Spring to fall. 
3. Nymphaea ádvena Soland. Perennial by thick rootstocks, light green. Leaves 
glabrous or nearly so, of two kinds, the submerged with suborbicular membranous blades on 
short petioles; emersed with long petioles; blades leathery, erect or rarely floating, oval 
or nearly so, 1-3 dm. long, rounded or retuse at the apex, the sinus open or rarely closed : 
flowers yellow, erect on stout scapes, depressed-globose : sepals obovate, rounded at the 
apex: petals obovate, rarely tinged with purple: anthers and filaments about equal in 
length : stigmatic disk yellow or pale red, with 12-24 lines, which terminate near the 
