[ HI ] 



MONO EC I A POLYANDRIA. 

 437. CERATOPHYLLUM. Hornwort. 



Linn.Gen. 493. Juss. IS. FLBr. 1020. Lam,t.77o. Gcertn.t.U. 

 Dichotophyllon. Dill. Gen. 91. /. 3. 



Nat. Orel. Inundatct. Linn. 15. Naiades. Juss. 6. Rather 

 akin to Hippuris; see y. 1. 4; and therefore to Mr. 

 Brown's Haloragccc; see Grammar, 167. 



Barr.Jl. Cal. in many, deep, equal, oblong, permanent, up- 

 right segments. Cor. none. Filam. twice as many as 

 the segments of the calyx, 16 — 20, erect, very short. 

 Anth. oblong, erect, rising above the calyx. 



Fert.Ji. Cal. as in the barren fl. Cor. none. Germ, superior, 

 ovate, compressed. Style scarcely any. Stigma simple, 

 oblong, oblique. Drupa ovate, compressed, crowned 

 with the permanent stigma ; its coat thin. Nut large, so- 

 litary, the shape of the drupa ; with 2 obovate cotijledoiis ; 

 and a many-cleft central embryo. 



Branched floating herbs., with whorled forked leaves, and 

 axillary, sii^sWe Jlo'tsjers. 



This genus is supposed by some botanists to be monocoty- 

 ledonous, though Jussieu suspected otherwise, and Gaert- 

 ner has plainly shown it to have 2 very distinct cotyle- 

 dons, which he chose to call a vitellus, taking the many- 

 cleft embryo, ov jdiimula, for cotyledons. The appearance 

 of this latter part seems to have led M. Richard to think 

 the genus allied to the Conifercc ; but if it had really 

 many-cleft cotyledons, like Phuis, that circumstance 

 would only prove such a character worthless, as to real 

 natural affinity. See Lindlcy in Hook. Scot. p. 2. 297. 



1. C. demcrsuni. Common Hornwort. 



Fruit armed with three spines. Segments of the calyx 



notched at the extremity. 

 C. demersum. Linn. Sp. PL \A09. inild.v. i.'\Oi>. Fl lir. 1020. 



Engl. Dot. V. 14. /. 947. Hook. Scot. 272. Gccrtn. v. 1. 212. 



t.A\; last f. 

 C . n . 1 :> 9 9 . 7/a //. Hist, r . 2 . 2 7;") . 

 Dichotophyllon. Dill. Gi.ss. 1 19. 

 Ilvdrocera'tophyllon folio aspcro, quatuor cornibus armato. Vaill. 



'Mem. (k I'Ar. dcs Sc. 299. t. 1 J./. 1 . Ran Sijn. K5j. 



