Pl.ex.caL 5*. CERATOPHYLLiE. 337. Ceratop. 555 



Hydroceratophyllon folio aspero, quatuor cornibuE armato, Jlaii Syn, 

 135,1. 

 ' Ceratophyllum demersum, Lin. S, P. 1409. 

 Ceratophyllum curnutuin, Richard Mem. Mus. 



Ditches and ponds ; perennial ; August and September, 

 Herlj floating under the surface; stem branchy; leaves in 

 whirls of 8, back-toothed, spinulose. 



2. Ceratophyllum verrucosum. Warty hornwort. 



Leaves forked ; three-paired^ fruit unarmed, warty. 



Hydroceratophyllon folio lasvi, octo cornibus armato, DiUenin Rail 

 Syn. 135,2. 



Ceratophyllum submersum, Lin. S. P. 1409. 

 Ceratophyllum demeraum jS, Hudson Fl. Angl.AlQ, 

 Ceratophyllum verrucosum, Richard Mem. Musi 



Ditches; perennial; September. 



Leaves more numerous than in C. cornutum ; calyx-lobes 

 toothed at the tip. 



Fam. XX. 55. HALORAGE^. R. Brown. 



FloLvers hermaphrodite, or unisexual; calyx adherent, 

 leaved, or very small ; corolla 1 or 4-petaled, or 0. — Male. 

 Stamens 1 or 8. — Fem. Styles 1 or 2; ovary adherent, 1 or 

 4-celled ; ovule 1 in each cell, pendulous from the top of 

 the cell ; perisperm 0, or very thin, fleshy ; corculuni 

 straight ; radicle above, longer than the cotyledons. — Plant 

 herbaceous, aquatic ; leaves opposite, or whirled ; flowers 

 axillary, solitary. 



Stamen 1 ; ovary 4<-celled Callitriche. 338. 



Stamen 1 ; ovary 1-celled Hippukis. 339. 



Stamens 8 ; ovary 4-celled Myriophyllum. 340. 



I. 338. CALLITRICHE. Pliny. Water-starwort. 



Monoicous or hermaphrodite ; calyx ; petals 0. — Male. 

 Stamen 1, exserted. — Fem. Styles 2; oyo/T/ 4-celled ; cells 

 1 -seeded, compressed, orbicular, margined ; perisperm 

 fleshy, thin. — Leaves opposite, upper leaves generally 

 crowded ; hractea 2 to each flower, coloured. 



1. Callitriche pollens. Pale ivatei'-starwort. 



Upper leaves aggregate ; fruit scarcely margined. 



Stellaria, Raii Syn. 289, 1. 

 Callitriche verna, Lin. S. P. 6. 

 Callitriche ^quatica, Hudson jFi.^n^Z. 439. 



Ditches and ponds ; annual ; April to October. 

 leaves all reverse ovate. 



