2 MONANDRIA DIGYNIA. Callitriche. 



C. hispida. Prickly Chara. Furrowed. Whorled 

 branches tapering, with internal partitions. Bracteas 

 whorled. Prickles on the stem bristly, bent down- 

 wards. E. B. 463. C. tomentosa. Sb. 



Clay-pits, pooh, ditches. * Peat bogs under Headington Wick 

 copse. Sb. Old gravel pits, St. Clement's, Oxford. Ponds on 

 the Botley road. B.v. Encrusted. 



An. July, August. 



(C. jiexilis. Smooth Chara. Smooth, transparent, 

 without prickles. Whorled branches cylindrical, blunt, 

 with a minute point, no internal partitions ; some 

 cloven. Bracteas none. 



Ditches and ponds. Ditches about Drayton, \Yarwickshire. Pn. 

 An. April, August. 



Slender, green, floating. Anth. naked. Stem. 1, to three feet long, 

 and more. Pn.) 



MONANDRIA DIGYNIA. 

 CALLrXRICHE '. Water-starwort. 



C. verna. Vernal Water-starwort. Fertile flower stalks 

 very short, with two petals at their base, fruit regu- 

 larly four cornered, margin of the seeds blunt. Leaves 

 triple-ribbed ; the uppermost crowded, inversely egg- 

 shaped. C. aquatica E. B. 722. /3 Fl. Brit. 9. H. 

 L. 127. See Sb. varieties y? 



Ditches, ponds, slow strewins. 

 An. April, May. 



Ls. opposite, linear, or battledore-shaped. Fl. white, axillary, 

 separated. 



C. autumnalis. Autumnal Water-starwort. Fertile 

 flower stalks, very short, without petals, fruit irregu- 

 larly four cornered, margin of the seeds membranous. 

 Ls. linear, abrupt, single-ribbed, uniform. C. aquatica 

 y. Fl. Brit. 9. E. B. 722. the small figure. Sb. 

 2. Var. y. 



Clear pools. 



An. June, October. 



Flowers united. Gray. 



' Gr. kalos, handsome, and thrix, hair, from its slender stems. 



