PI. ex. cal. 54. CERATOPHYLLiE. 337. Ceratop. 555 
Hydroceratophyllon folio aspero, quatuor cornibus armato, Rail Syn. 
135,1. 
Ceratophyllum demersum, Lin. S. P. 1409. 
Ceratophyllum cornutum, Richard Mem. Mus. 
Ditches and ponds; perennial; August and September. 
Herb 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 laevi, octo cornibus armato, Dillenin Rati 
Syn. 135, 2. 
Ceratophyllum submersum, Lin. S. P. 1409. 
Ceratophyllum demerauin /3, Hudson FI. Angl. 419. 
Ceratophyllum verrucosum, Richard Mem. Mus. 
Ditches ; perennial ; September. 
* Leaves more numerous than in C. cornutum ; calyx-lobes 
toothed at the tip. 
Earn. XX. 55. HALORAGE^E. R. Brown. 
Flowers hermaphrodite, or unisexual; calyx adherent, 
leaved, or very small ; corolla 2 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 Hippuris. 339. 
Stamens 8; ovary 4^- celled Myriophyllum. 340. 
I. 338. CALLITRICHE. Pliny. Water-star wort. 
Monoicous or hermaphrodite; calyx 0; petals 0. — Male. 
Stamen 1, exserted. — F em. Styles 2; ova ry 4-celled ; cells 
1 -seeded, compressed, orbicular, margined ; perisperm 
fleshy, thin. — Leaves opposite, upper leaves generally 
crowded ; bractea 2 to each flower, coloured. 
1 . Callitriche pallens. Pale water-star wort. 
Upper leaves aggregate ; fruit scarcely margined. 
Stellaria, Raii Syn. 289, 1. 
Callitriche verna, Lin. S. P. 6. 
Callitriche aquatica, Hudson FI. Angl. 439. 
Ditches and ponds; annual; April to October. 
Leaves all reverse ovate. 
