CL. XXI.] MONCECIA POLYANDRIA. 361 



1. B, dioica. Red-berried Bryony. Leaves palmate, rough on 



both sides ; barren flowers and fertile flowers on separate plants. 



Stems several feet long, climbing by their tendrils : leaves large, 

 five-lobed : flowers white, veined with green, in axillar panicles : 

 berries scarlet. The root is acrid and purgative. Perennial : flowers 

 from May to September : grows in hedges and thickets, in England : 

 frequent. Eng. Bot. vol. vii. pi. 439. Eng. Fl. vol. iv. p. 138. 1357. 



POLYANDRIA. 



15. CERATOPHY'LLUM. HORN WORT. 



Barren Flowers. Calyx deeply divided into many oblong, 

 equal, erect, permanent segments. Corolla none. Filaments 

 twice as many as the segments of the calyx, from sixteen to 

 twenty, very short; anthers oblong, erect, longer than the 

 calyx. 



Fertile Flowers. Calyx and corolla as in the barren flowers. 

 Germen superior, egg-shaped, compressed. Style none ; stigma 

 oblong. Drupe egg-shaped, compressed, crowned with the 

 permanent stigma. Nut large, of the shape of the drupe. 

 Name from ceras, a horn, and phyllon, a leaf. 434. 



1. C. demersum. Common Hornwort. Fruit armed with three 



thorns ; segments of the calyx notched at the end. Two or three 



feet long, dark-green, with numerous whorled leaves, repeatedly di- 

 vided into linear segments. Perennial : flowers in August and 

 September : grows under water, in ditches, lakes, and slow rivers : 

 frequent. Eng. Bot. vol. xiv. pi. 947. Eng. Fl. vol. iv. p. 141. 1358. 



2. C. submersum. Unarmed Hornwort. Fruit thornless ; segments 



of the calyx acute, entire. Resembles the former. Perennial : 



flowers in September : grows in ditches in the east and south of Eng- 

 land : rare. Eng. Bot. vol.x. pi. 679. Eng. Fl. vol. iv. p. 142. 1359. 



16. MYRIOPHY'LLUM. WATER-MILFOIL. 



Barren Flowers. Calyx of four oblong, erect leaves, the 

 outer largest. Petals four, inversely egg-shaped. Filaments 

 eight, hair-like, longer than the calyx ; anthers oblong. 



Fertile Flowers beneath the others. Calyx and corolla the 

 same. Germens four, inferior, oblong. Styles none ; stigmas 

 downy. Drupes four, oblong. Nuts solitary, with a hard 

 shell, containing a single kernel. Name from myrios, a myriad, 

 and phyllon, a leaf. 435. 



1. M. spicdtum. Spiked Water-milfoil. Flowers in .whorled, in- 

 terrupted, leafless spikes. Stem slender, branched, round, se- 

 veral feet long, with finely pinnatifid, spreading leaves, four together 

 in a whorl : petals reddish. Perennial : flowers in July arid Au- 

 gust : grows under water, in ditches, pools, lakes, and rivers : 

 frequent. Eng. Bot. vol. ii. pi. 83. Eng. Fl. vol. iv. p. 143. 1360. 



2. M.verticilldtum. Whorled Water-milfoil. Flowers axillar. 



Stem several feet high, the flowering part of the stem or branches 



2 H 2 



