MONANDRIA DIGYNIA. 3 



2. C. hispida, furrowed ; whorled branches tapering, with in- 

 ternal partitions ; bracteas whorled ; prickles on the stem bristly, 

 de flexed. Prickly Char a. 



Hab. Lough in Holy Island. July, Aug. 



Mr THOMPSON says, that the Chara flexilis grows abundantly 

 at the ' mouth of the rivulet at Goswick," but we could 

 never find there any other than C. vulgaris less incrusted 

 than usual. 



II. DIGYNIA. 



4. CALLITRICHE. 



1. C, vema, leaves triple-ribbed, the uppermost crowded, ob- 

 ovate ; margin of the seeds obtuse. Vernal Water -starwort. 



Hab. Ditches and ponds common. May. Q 



The upper leaves are crowded into a star-like form, and float 

 on the surface; but sometimes all the leaves are linear, 

 distant and immersed, a state in which it approaches C. au- 

 tumnalis. It produces seed most profusely when left dry. 



2. C. autumnalis, leaves linear, abrupt, single-ribbed, uniform ; 

 margin of the seeds membranous. Autumnal Water-starwort. 



Hab. Pools of water in the Vale below Langleyford, with 

 the preceding. June October. Q 



Grows in a very bushy or cespitose manner. Stems slender, 

 branched. Leaves very narrow, perfectly linear, emargi- 

 nate at the point, cellular. The upper ones become crowd- 

 ed as they rise to the surface, and somewhat ovate, but, 

 even under a high magnifier, they are all single-ribbed, and 

 notched at the apex. 



