Cbratopiiyllum. CERATOPHYLLACEiE. 53 



1. C. Caroliniana (Gray): floating leaves elliptical or linear-oblong; 

 flowers white ; ovaries 3 or A.— Gray, I. c.—C. Aublutii, Midi.c.Jl. 1. p. 200. 

 Nectris pcltata, Pursh, f. 1. p. 239. rexcl. syn.) N. aquatica, Null. gen. 

 1. p. 230 ; Ell. ! sk. 1. p. 416, not of U7//c/. 



In stagnant waters, from Newbern, N. Carolina (Croo7?i.') to Georgia! 

 and Louisiana ! May.— Stem branching. Submersed leaves with a renifomi 

 circumscription, 3-parted to the base: segments 3 times di-(middle one tri-) 

 chotomous ; lobes filiform, flat, obtuse. Floating leaves about an inch long 

 (often cmarginate at one end). Flowers about half an inch in diametor, 

 rarely 2-scpalous and 2-petalous. Petals oval, obtuse, with 2 yellow 

 spots at the base. Carpels ovate. — See Ann. lye. I. c. 



2. BRASENIA. Schrcb. gen. p. 372 ; Nutt.gen. 2. p. 23. 



Hydropeltis, Michx. 



Sepals 3-4, colored within, persistent. Petals 3-4. Stamens 18-36. Ova- 

 ries 6-18. Carpels oblong-ovate, 2- (or by abortion 1-) seeded.— Stem, pedun- 

 cles, and lower surface of the centrally peltate leaves, thickly covered with a 

 gelatinous and viscid transparent substance. Flowers brownish-purple. 



B. pel fata {V\irsh)—Nutt. I. c. ; Gray, I. c— Hydropeltis purpurea, 

 Mich.v. ! fl. 1. p. 324, t. 29 ; Bot. mag. t. 1147 ; DC. prodr. 1. p. 112. 



In still water, Canada! to Georgia! and west to Arkansas. July. — Stem 

 1-10 feet long. Leaves elliptical, alternate. Flowers the size of Caltha pa- 

 lustris.— See Nutt. I. c. for remarks on the structure of the stem and leaves. 



Order VIII. CERATOPHYLLACE^. S. F. Gray. 



Flowers moncecious. Sepals 8-12, united at the base (sometimes 

 cleft at the extremity), persistent. Petals none. Stamens 12-24 : an- 

 thers sessile, ovate-oblong, 2-3-cuspidate, crowded in the centre of the 

 calyx. Ovary free, ovate, simple : style filiform, oblique : stigma simple. 

 Fruit a crustaceous l-seeded achenium, apiculate with the indurated 

 persistent style. Seed suspended, orthotropous, destitute of albumen. 

 Embryo with a short radicle, 4 cotyledons (the opposite (upper) ones 

 smaller), and a highly developed gemmule. — Submersed aquatics, 

 growing in still water. Stems branching. Leaves whorled, rather 

 rif^id, 2-4-chotomously cleft into filiform or setaceous segments, which 

 are sometimes slightly toothed. Flowers axillary, minute. Fruit 

 armed with the persistent style and usually with two lateral spines. 



1. CERATOPHYLLUM. Linn.; Gcertn. fr. t. 44; Ad. Brongn. in 

 ami. SCI. nat. 12. t. 44; Cham, in Linncea, 4. p. 503 ; Gray, in ami. lye. 

 New- York, 4. p. 41. 



Character same as of the Order. 



1. C. apiculatum (Cham.) : achenium elliptical, compressed, with a sin- 

 gle weak and short terminal spine ; margins wingless, not gibbous, furnished 



