NYMPHAEACEAE 541 
penal and leaf-blades thick : submersed leaves wanting. . 
eaf-blades ovate or oval: inner sepals ee fruits 
pepe disk green or yellowish-gree 6. N. macrophylla. 
Leaf-blades elliptic-ovate: inner sepals CuHentesdbovdter 
fruits narrowly ovoid; disk chrome-yellow to red. 5. N. advena. 
III. ORBICULATAE 
Leaf-blade with a closed sinus: stamens in 9 or 10 rows: flowers 
about 5 mm. in diameter: seeds about 4 mm. long. 7. N. orbiculata. 
BT with an open sinus: stamens in 6 or 7 rows: flowers 
b er: seeds about 6 mm. long. 8. N. bombycina. 
1. N. sagittifolia Walt. Blades of the floating leaves narrowly elliptic- 
2 to elliptic, s em. long, kon sinus V-shaped; petioles stoutish: 
flowers spheroidal, 2.6—2 m. in diam 
sepals 6, the outer elli e ic or o 
2-2.6 em. long, the 3 inner suborbicular: fila! 
np fully as us as ae nthers or nearly 
: fruit ovoid, 3 ass - oe ay ne 
the ped with line 
Hs DN [Nuphar ala Posh. 
prc W-LOTUS.) — Sluggish streams and 
tidal Pu. Coastal Plain, S. C. and N. C. 
2. N. ulvacea Miller & Standley. Blades 
of the floating leaves lanceolate to ovate- 
apie. 11.5-16.5 em. long, the sinus 
closed ; 
8, 
inner broadly obovate, clawed : INR shorter than the anthers: fruit 
subglobosa or ovoid-globose, 1.5-2.1 cm. long, ribbed to the base, the 
disk with elliptic stigma-rays: seed 3-4 mm. long.—Slow streams, W Fla. 
3. N. fluviatilis Harper. a of the floating leaves suborbicular or 
ovate-orbicular, 18-25 cm. long, thin, the sinus open: flowers spheroidal, 
about 2.5 em. in diameter: ps bes very thin, the 3 outer nearly elliptic, 
16-18 mm. long, the 3 inner obovate, slightly E than the outer, 
elawed: petals about as long as the stamens, mostly truneate: fruit (imma- 
ture) ovoid; disk orbicular, the bot linear. ums “and bayous, Coastal 
Plain, and adj. provinces, W Fla. to Ala. and N. C. 
4. N. chartacea rad B Mes Blades of the E uada oe to 
elliptic-ovate, 14-23 c ong, , the sinus closed or very narrow: flowers 
spheroidal, 3—3.5 em. in ae sepals 6, thin A 3 outer elliptic, 12—20 
mm. long, the 3 inner obovate, nearly or quite as long a the outer, and thinner: 
petals about as long as the stamens, rounded o r truncate at the apex: fruit not 
seen.—Ponds and bayous, near the Gulf, Fla. i5 Mis 
5. N. advena Ait. Leaf-blades n normally borne nae the surface of 
the water, mm to oval, 15-33 e ong, p ded bie: , the sinus usually 
forming a right angle; petioles gd. terete: ipe 3—4 j 
i 35 mm. g, 
d er: 
suborbicular, about as long as the outer: m elear-yellow like the inner 
sepals, about 20, elliptie- ed about 8 m ng, truncate or retuse at the 
apex: filaments euneate-linear, somewhat rund than pn anther, usually dull- 
red except the yellow tip: fruit A ee about 5 in dia meter; disk 
light-green or yellowish-green. [Nup advena R. Br. cc Mein x m 
Ponds and streams, various m Ga. to Tex., Nebr., Wis., and N. 
