NufHHAR. NYMPHiEACEiE. 57 



Order X. NYMPHiEACEiE. S'allsb. (in part.) 



Sepals and petals numerous, imbricated, passing gradually into 

 each other, the former persistent, the latter inserted upon tlie disk 

 which surrounds the pistil. Stamens indefinite, in several rows, in- 

 serted into the disk : filaments petaloid : anthers adnate, introrse. 

 Torus a fleshy disk surrounding the ovary more or less. Ovary many- 

 celled, many-seeded: stigmas radiate. Fruit many-celled, indehiscent. 

 Seeds very numerous, covering the spongy dissepiments, or rather 

 placentie, and enveloped in a gelatinous aril, anatropous. Albumen 

 forinaceous. Embryo minute, next tlie hilum, inclosed in the mem- 

 branous sac of the nucule : cotyledons foliaceous. — Herbs with pel- 

 tate or cordate fleshy leaves, and 1-flowered peduncles, arising from a 

 prostrate trunk : aquatic. Flowers large, white or yellow. 



1. NYMPH^A. Tourn. ; DC. syst. 2, p. 49. 



Sepals 4, at the base of the torus. Petals and stamens passing insensibly 

 into each other, attached to the torus which surrounds the ovary. — Flowers 

 white or rose-color.— 7 White Water-Lily. 



1. N. odorata (Ait.) : leaves orbicular or somewhat reniform, with the 

 primary veins numerous and prominent beneath; stigma 16-20-rayed; rays 

 incurved. 



a. sinus and lobes of the leaf more or less acute. — N. odorata, Ait. Kew. ; 

 Willd. hort. Berol. 1. t. 39; Pitrsli,fl. 2. p. 368 ; BC. syst. 2. p. 57; Hook. ft. 

 Bor.-Am. 1. p. 32. N. alba, Micha:. ! Ji. 1. p. 311. 



/?. sinus and lobes more or less rounded. — N. reniformis, Walt. Car. p. 

 155; DC. syst. I. c; Deless. ic. 2. t.5. Nelumbium reniforme, Willd. 

 sp. 2. p. 1260. 



y. smaller; leaves and peduncles purplish; flowers rose-color. — N. odorata 

 0. rosea, Pursh, I. c. N. odorata /?. minor, Bat. mag. t. 1652. N. minor 

 DC. I.e. 



In deep and in shallow water, throughout N. America east of the Rockv 

 Mountains! June-Sept. — Rhizoma very large. Leaves floating; sinus reach- 

 ing to the centre. Flower fragrant, closing in the afternoon. — N. alba is said 

 by Nuttall to grow in the neighbourhood of Detroit. 



2. NUPHAR. Smith ; DC. syst. 2. p. 59. 



Sepals 5-6, petaloid, inserted at the base of the torus. Petals numerous 

 inserted with the sepals, very much smaller, nectariferous on the back. 

 Stamens inserted with the petals. — Flowers yellow.— Ye/Zoto Pond-Lily. 



}■ N. lutea (Smith) : sepals 5 ; stigma entire, 16-20-rayed, deeply um- 

 bilicate ; leaves cordate-oval, with approximate lobes ; petioles triquetrous. 

 DC— Ait. Kew. (ed. 2.) 3. p. 295 ; Pursh, A. 2. p. 369 ; Hook.Jl. Bor.-Am. 



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