NYMPHAEACEAE (WATER LILY FAMILY) 391 



dm. long), from roundish to ovate or almost oblong, the sinus open, lobes 

 subtriangular. {Nnphar Ait. f.) — Very common in still or stagnant water, 

 especially from N. Y., southw. and westw. Northw. and northeastw. largely 

 replaced by Var. variegata (Engelm.) Fernald, which has flowers partly 

 purple and leaves with a closed sinus and relatively shorter rounder lobes. (X 

 variegata G. S. Miller.) 



X ? N. rubrodisca (Morong) Greene. More slender ; leaves somewhat 

 smaller (12 dm. long); flowers usually smaller (sepals 2. 5-^3 cm. long); stigma 

 9_13_rayed, crenately toothed, bright red or crimson ; fruit (2.5 cm. long) 

 decidedly contracted above. {N. hybrida Peck; Nuphar advena, var. minus 

 Morong.) — N. B. to Mich, and Pa. — Probably a hybrid between N. advena, 

 var. variegata and the next species. 



2. N. microphylla Pers. Very slender and with slender rootstock; sub- 

 mersed leaves thin, round-reniform, the floating broadly elliptical, 3.5-10 cm. 

 long, with a deep narrow sinus; sepals usually 5; flowers 2.5 cm. or less in 

 diameter; petals spatulate or obovate ; stigmas 1-10-rayed, dark red; fruit 

 globular (1.2-1.8 cm. in diameter) with a short neck. (.V. Kalmiana Sims; 

 Xuphar Ait. f.)— N. B. to Pa. and Minn., and northw. — Doubtfully distinct 

 from N. minima Peichenb. of Eu. 



.3. N. sagittif51ia Walt. Rootstock stout ; leaves narrowly oblong to oblong- 

 lanceolate (1.5-3 dm. long), with short sinus; flowers small, 2.5 cm. broad. 

 {Nuphar Pursh.) — S. Ind. and 111. {Schneck), and southw. 



2. CASTALIA Salisb. Water Nymph. Water Lily 



Sepals 4, green outside, nearly free. Petals numerous, in many rows, the 

 innermost gradually passing into stamens, imbricately inserted all over the 

 ovary. Stamens indetinite, inserted on the ovary, the outer with dilated fila- 

 ments. Ovary 12-35-celled, the concave summit tipped with a globular projec- 

 tion at the center, around which are the radiate stigmas ; these project at the 

 margin, and are extended into linear and incurved sterile appendages. Fruit 

 depressed-globular, covered with the bases of the decayed petals, maturing under 

 water. Seeds enveloped by a sac-like aril. — Flowers white, pink, yellow, or 

 blue, very showy. (Kao-raXia, a mythical fountain on Parnassas, sacred to 

 Apollo and the Muses.) Nymph ae a L. in part. 



1. C. odorata (Ait.) Woodville & Wood. (Sweet-scented Water Lily.) 

 Bootstock with few and persistent branches; leaves orbicular (0.5-2.2 dm. 

 wide), deeply-cordate-cleft at the base, the margin entire, often crimson beneath ; 

 stipules broadly triangular or almost kidney-shaped, notched at the apex, 

 appressed to the rootstock; flower white, very sweet-scented (0.5-1.3 dm. in 

 diameter, when fully expanded, opening early in the morning, closing in the 

 afternoon); petals obtuse; anthers blunt ; aril much longer than the distinctly 

 stipitate ellipsoid seeds, these about 3 mm. long. (Nymphaea odorata Ait., 

 including var. minor Sims.) — Ponds and still or slow-flowing water ; common. 

 Jiine-Sept. Passing to the somewhat ill-defined forma rosea (Fursh) Britton, 

 wirh pink or bright pink-red flowers. — Shallow ponds, mostly near the coast. 

 \av. gigaxtea (Tricker) Fernald. Larger; leaves 2-4 dm. broad, the margins 

 turned up ; flowers (white or nearly so) 1-1.5 dm. in diameter, less fragrant; 

 sepals greenish. (Xymphaea odorata, var. Tricker.) — Del. to Fla. and La. 

 (Mex., W. I., S. A.) 



2. C. tuberbsa (Paine) Greene. Leaves reniform-orbicular, mostly larger 

 (2-4 dm. wide) and more prominently ribbed than in the last, rarely purplish 

 beneath ; rootstock bearing mimerous spontaneously detaching often compound 

 tubers; floiner scentless (or witli a slight odor as of apples), white, never pink, 

 1-2 dm, in diameter, the petals proportionally broader and blunter than in 

 no.l ; the fruit more depre.ssed, and with fewer but much larger {i.e. twice 

 as broad) globular-ovoid seeds, which when mature are barely inclosed by the 

 aril and not stipitate. {Xymphaea Paine ; N. reniformis of auth., not Walt.) — 

 Slow rivers, etc., n. Vt. to Del. {Commons), e. Neb., and Ark. 



