76 FOUNDATIONS OF BOTANY 
I. NELUMBO, Tourn. 
Rootstock large and stout. Leaves round, shield-shaped, 
often raised above the water. Flowers large, raised above 
water at first, but often submerged after blooming. Sepals 
and petals hypogynous, numerous, the inner sepals and outer 
petals not distinguishable from each other. Stamens many, 
hypogynous. Pistils several, 1-ovuled, borne in pits-in the 
flattish upper surface of a top-shaped receptacle, which en- 
larges greatly in fruit. 
1. N. lutea, Pers. AMERICAN Lotus. WATER CHINQUAPIN. 
Rootstock often 3-4 in. in diameter, horizontal. Leaves 14-24 ft. 
broad, prominently ribbed, with much bloom above, often downy 
beneath. Petioles and peduncles stout. Flowers pale yellow, 5-9 
in. broad. Sepals and petals falling quickly. Fruit top-shaped, 
3-4 in. in diameter; the seeds $ in. in diameter. In ponds and 
slow-running streams W., introduced from the Southwest.* 
Il. NYMPHAZA, Tourn. 
Rootstock horizontal, creeping extensively. Leaves float- 
ing, entire, shield-shaped or heart-shaped. Flowers showy. 
Sepals 4, green without, white within. Petals many, white, 
becoming smaller towards the center. Stamens many, the 
outer with broad and the inner with linear filaments. Ovary 
many-celled, stigmas shield-shaped and radiating. Fruit berry- 
like, many-seeded.* 
1. N. odorata, Ait. Wuite WarTer-tity. Rootstock large, 
branched but little. Leaves floating, entire, the notch narrow, and 
basal lobes acute, green and smooth above, purple and downy 
beneath. Petioles and peduncles slender. Flowers white, very 
fragrant, opening in the morning, 3-5 in. broad. Fruit globose, 
seeds enclosed in a membranaceous sac. In ponds and still water.* 
Ill. NUPHAR, Smith. 
Rootstock horizontal, thick, cylindrical. Leaves heart- 
shaped, floating or erect. Flowers yellow. Sepals 4-6, 
green on the outside, obovate, concave. Petals many, hypogy- 
nous, the inner ones becoming small and stamen-like. Sta- 
mens many, hypogynous. Ovary cylindrical, many-celled, 
stigma disk-shaped, Fruit ovoid.* 
