CL. XXI.] MONffiClA POLYANDRIA. 361 



1. B.diiiica. Red-berried Bruonii. 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 : 

 crows in hedges and thickets, in England: frequent. Eng. Bot. vol. vii. 

 pi. 439. Eng. Ft. vol. iv. p. 138. 1357. 



POLYANDRIA. 

 15. CERATOPHY'LLUM. HORNWORT. 



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 per- 

 manent stigma. Nut large, of the shape of the drupe. Name 

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



1. C. demtrsum. 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 divided 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 England : 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 bene'ath 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. spicdinm. Spiked Water-milfoil. Flowers in whorled, inter- 

 rupted, leafless spikes. Stem slender, branched, round, several feet 



Ion", with finely pinnatifid, spreading leaves, four together in a whorl : 

 petals reddish. Perennial: flowers in July and August: grows under 

 water, in ditches, pools, lakes, and rivers : frequent. Eng. But. vol. ii. 

 pi. 83. Eng. FL. vol. iv. p. 143. 1360. 



2. M. verticilldlum. Whorled Waier-milfoil. Flowers axillar. 



Stems several feet high, the flowering part of the stem or branches rising 



2 H 2 



