56 NYMPH^ACEJK. (aVATER-LILY FAMILY.) 



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

 l^' 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. minor, Sims, with leaves only 2 - 5' and flowers 2-3' broad. — Shal- 

 low water, in cold bog^ and in sandy soil, 



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

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

 rarely purplish beneath; rootstock bearing numerous spontaneous! tj detachmg 

 often compound tubers ; fioicer 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. (X. tuberosa, Paine.) — Lakes, slow 

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

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



6. NUPHAB, 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 

 (Xame said to be of Arabic origin.) 



1. W". ad vena, Ait. f. Sepals 6, unequal ; petals shorter than the stamens 

 and resembling them, tliick and fleshy, truncate; stigma nearly entire, 12 -24- 

 rayed, pale red; ovary and fruit (1^' 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 oldong, the 

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

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



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

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

 9 - 13-rayed, crenately toothed, bright red or crimson ; fruit V long, contracted 

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

 Midi, 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-reniform, the floating broadly elliptical with a 

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

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

 lar with a short neck (6-9" in diameter). (X. 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 (!' broad). 



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



