48 MONAJTDBIA. BIGYNIA, fcL. I. 



L 



slender than the last. All the species in this section are probably 

 varieties of the present one. Annual : flowers throughout the 

 summer : grows immersed in ditches, pools, and still rivers : fre- 

 quent. Eng. Bot. vol. xv. pL 1070. Eng. Fl. vol. i. p. 7. 10, 



7. C. nidifica. Proliferous Water Horse-tail. Stems simple, below ; 

 whorled branches simple, elongated, those bearing flowers axillar, 

 very numerous, compound, crowded; bracteas distinct, unequal. 

 Annual : flowers from August to October ; grows in salt water 

 ditches: very rare. Shoreham, Sussex ; Clay,Norfolk. LochNeagh, 

 Ireland. Eng. Bot. vol. xxiv. pi. 1703. Eng. Fl. vol. i. p. 8. 11. 



8. C. grdcilis. Slender Water Horse-tail. Stems transparent, 

 smooth ; whorled branches acute, repeatedly forked, and as well as 

 the compound axillar one, often bearing flowers ; bracteas wanting. 



A small, delicate, pale-coloured, glossy plant. Annual : flowers 



in August and September : grows in still water ; rare. Fish-ponds 

 in Jersey; Sussex; North Wales. Eng. Bot. vol. xxx. pi. 2140. 

 Eng. Fl. vol. i. p. 9. 12. 



DIGYNIA. 

 5. CALLITRICHE. STAR-WORT. 



Calyx none. Petals two, curved inwards, opposite, eqnaL 

 Filament slender.,, elongated. Anther two-lobed. Germen su- 

 perior, four-lobed. Styles two, hair-like. Stigmas acute. Seeds 

 four, oblong. Name from kallos, beautiful, and tlirix, hair. 5, 



1. C. verna. Vernal Water Star-wort. Fruit -bearing peduncles 

 very short, with two braeteas at their base ; fruit regularly tetra- 

 gonal, each portion bluntly keeled at the back. Stems feeble, nu- 

 merous, branched, leafy ; leaves varying from linear to oval, the 

 upper three-nerved, and crowned. Annual : flowers in April and 

 May : grows by the edges of pools, ditches, and brooks : common. 

 Eng. Bot. vol. xi. pi. 722. Eng. Fl vol. i. p. 10. 13. 



2. C. pedunculdta. Peditnculated Water Star-wort. Fruit -bearing 

 peduncles elongated, without bracteas at the base ; fruit regularly 



tetragonal, each portion bluntly keeled at the back. Leaves all 



linear. Annual : flowers in June : grows in a ditch at Amberley, 

 Sussex. Eng. Bot. Suppl. pi. 2606. Brit. Fl. 4th ed. p. 329. 14. 



3. C autumndlis. Autumnal Water Star-wort. Fruit-bearing pe- 

 duncles very short, without bracteas ; fruit irregularly tetragonal, 



each portion broadly and acutely winged at the back. Leaves 



all linear, fruit larger than in the other species, its dorsal wing very 

 Voad. Annual : flowers from July to October : grows in the Loch 

 of Cluny, in Scotland ; in the outlet of Llyn Maclog, Anglesea ; 

 and near London. Loch Neagh, Ireland. Eng. Bot. vol. xi, pi. 722, 

 small figure. Brit. Fl. 4th ed. p. 329. 15. 



