>;YMi'ii.t:ACK.K. (water-lily family.) 19 



inside. Petals 3-4, Avithering-porsistcnt. Stamens 6-18 : anthers ad- 

 nate, extrorse. Ovaries 2-18. Ovules suspended. Capsule iudebisccnt, 

 1-3-seeded. Embryo minute, at the base of Heshy albumen. 



1. CABOMBA, Aublet. 



Sep.nls and petals .3 Stamens 6. Ovaries 2-4. Capsule 1-3-sccclcfl. — 

 Stems filiform, branching. Submerged leaves opposite, divided into numerous 

 filiform flattened segments ; floating ones peltate, entire. Flowers small, in the 

 axils of the floating leaves. 



1. C. Caroliniana, Gray. Floating leaves oblong-linear ; flowers white. 

 (Xeetris aquatica, Nidt.) — Ponds and still water, Florida to North Carolina, and 

 westward. June- August. — Stems 2° -4° long. 



2. BRASSIOA, Sehreber. Water-shield. 



Sepals 3-4, purple inside. Petals 3-4, linear, persistent. Stamens 12-18: 

 anthers exserted. Ovaries 4-18. Capsule 1-2-seeded. — Leaves all ]ieltate 

 and entire, alternate, oval, on long petioles. Flovvers axillary, on elongated 

 peduncles, dull pur])le. 



1. B. peltata, Pursh. (Ilydropeltis purpurea, ^V/c/ir.) — Ponds and slow- 

 flowing streams, Florida and northward. July. — Stem, petioles, and lower 

 siii"facc of the leaves coated with a gelatinous, viscid exudation. Leaves 2' - 3' 

 wide. 



Oki>ku 8. NY31PIIy'EACEiE. (Watku-Lily Family.) 



Aquatic herbs, with peltate or cordate, entire, floating leaves, and soli- 

 tary white or yellow flowers on long pedui\cles. Sepals 4 - G, colored 

 inside. Petals numerous, h)'pogynous or perigjnons, imbricated in the 

 bud. Stamens numerous. Ovary many-celled. Ovules numerous, in- 

 serted on the partitions. Stigmas radiate or peltate. Fruit baci*ate, 

 many-seeded. Embryo included in a sac at the extremity of farinaceous 

 albumen. 



1. imVEPH^A, Tourn. Water-Lit.y. 



Sepals 4, green outside. Petals oblong, inserted into the thin torus which 

 envelops the ovary, the inner ones passing into stamens. Stamens numerous, 

 inserted above the petals, the outer ones petal-like : anthers adnate, intror.se. 

 Ovary many-celled. Stigmas as many as the cells, linear, radiating around a 

 globular central gland. Beny globose. Seed enclosed in a membranaceous 

 aril. — Leaves orliicular, cleft at the base to the centre, floating. Flowers on 

 elongated, often spiral peduncles. 



1. N. odorata, Ait. (Poxd-Lily.) Phizoma large, crce]iing ; leaves 

 6'- 12' wide, entire, the sinus narrow and the lobes acute, or else with an open 



