56 NYMPH^ACE^. (WATER-ilLY FAMILY.) 



blunt ; aril much longer than the distinctly stipitate oblong seeds (these about 

 ly long). — Ponds and still or slow-flowing water ; common. June - Sept. — 

 Varies with pinkish-tinged and rarely with bright pink-red flowers (especially 

 at Barnstable, Mass.), the leaves often crimson underneath, — and in size by 

 gradations into 



Var. rQinor, iSims, with leaves only 2-5' and flowers 2-3' broad. — Shal 

 low water, in cold bogs and in sandy soil. 



2. N. reniformis, DC. (Tuber-bearing W.) Leaves reniform-orbic- 

 ular, mostly larger (8-15' wide) and more prominently ribbed than the last, 

 rarely purplish beneath; rootstock bearing numerous spontaneous! i/ detaching 

 often compound tubers ; flower scentless (or with a slight odor as of apples), 

 white, never pinkish, 4^-9' in diameter, the petals proportionally broader 

 and blunter than in n. 1 ; the fruit more depressed, and with fewer but much 

 larger (i. e. twice as broad) globular-ovoid seeds, which when mature are barely 

 enclosed by the aril and not stipitate. (N. tuberosa, Pame.) — Lakes, slow 

 rivers, etc., western N. Y. (from Oneida Lake, Paine) and near ]Meadville, Penu., 

 to Mich., E. Neb., and probably in the Southern States. July -Sept. 



5. NUPHAR, Smith. Yellow Pond-Lily. Spatter-Dock. 



Sepals 5, 6, or sometimes more, colored, or partly green outside, roundish, 

 concave. Petals numerous, small and thickish, stamen-like or scale-like, in- 

 serted with the very numerous short stamens on the receptacle under the 

 ovary, not surpassing the disk-like 8 - 24-rayed sessile stigma, persistent and 

 at length recurved. Fruit ovoid, naked, usually ripening above water. Aril 

 none. — Rootstock creeping, cylindrical. Leaves with a deep sinus at the 

 base. Flowers yellow or sometimes tinged with purple, produced all summer. 

 (Name said to be of Arabic origin.) 



1. N. advena, Ait. f. Sepals 6, unequal ; petals shorter than the stamens 

 and resemWiug them, thick and fleshy, truncate; stigma nearly entire, 12 -24- 

 rayed, pale red; ovary and fruit (H' long) ovate, not contracted above into a 

 narrow neck ; thin submersed leaves seldom present ; floating or emersed and 

 erect leaves thick (6-12' long), from roundish to ovate or almost oblong, the 

 sinus open, or closed or narrow. — Very common, in still or stagnant water ; 

 stout and coarse; flower often partly purplish (var. variegatlm, Engelm.). 



Var. minus, Morong. More slender; leaves somewhat smaller (3-8' 

 long) ; flowers usually smaller (sepals 12-15" long) ; petals spatuiate ; stigmas 

 9 - 13-rayed, crenately toothed, bright red ur crimson ; fruit 1' long, contracted 

 above. (N. rubrodiscum, Morong. N. luteum, Man.; not Smith.) — N. Xt. to 

 Mich, and Penn. Probably a hybrid between this and the next species. 



2. N. Kalmianum, Ait. Very slender and with slender rootstock; 

 submersed leaves thin, round-renifoi'm, the floating broadly elliptical with a 

 deep narrow sinus, 2-4' long ; sepals usually 5, the flowers an inch broad or 

 less ; petals spatuiate or obovate ; stigmas 7 - 10-rayed, dark red ; fruit globu- 

 lar with a short neck (6 - 9" in diameter). (N. luteum, var. pumilum, Man.) 



— Maine to Penn. and Minn., and northward. 



3. N. sagittifolium, Pursh. Rootstock stout; leaves narrowly oblong 

 to oblong-lanceolate with a short sinus, 6-15' long; flowers small (1' broad)- 



— S. Ind. and 111. (Schneck), and southward. 



