CERATOPHYLLACE^:. CALLITRICHACEJE. 167 



688. M. annua, L. 



Colonist ; in gardens and cultivated fields, and on rubbish 



heaps, chiefly about towns and villages. Common. 

 Gr. Abundant about Clifton, both in gardens and waste 



places. Almondsbury. Charfield. Horfield. Redland. 



Westbury. Warmley. 

 S. A common weed about Bath. Knowle. Long Ashton. 



Clevedon. Portisbead. Very plentiful about Weston- 



super-Mare. 

 p. M. ambigua, L. 

 Crew's Hole ; Herb. Stephens. VIII. IX. 



CERATOPHYLLACE^E. 

 CERATOPHYLLUM, L. 



689. C. demersum, L. 



Native ; in ponds and ditches, locally common. 



S. Abundant in rbines and ditches near Yatton, Clevedon, 

 Kingston Seymour, and Weston-super-Mare. In plenty 

 in the canal near Bath ; Fl. Bathon. VI. VTI. 



690. C. submersum, L. 



Native ; as yet known only in one spot. 



G. In a pond near Charfield. VI. VII. 



CALLITRICHACE.E. 

 CALLITRICHE, L. 



691. C. verna, L. 



Native; in ponds and streams. We have some records 

 which may refer to this species as at present defined ; 

 but further study is needed before a positive opinion 

 can be offered. The genus has been so split that it is 

 hard to say now what is left to represent verna. 



