By Thomas Bruges Flower, Esq. 70 



above, has boon found in the Kcnnct and Avon Canal at Bath, and 

 mould be looked for in the county. 



I. P. perfoliate, (Linn.) perfoliate Pondwced. Engl. Bot. t. 

 168. Reich Icones, vii., 29. 



Locality. In the Upper and Lower Avon, Kennet and Avon 

 Canal, and ponds. P. El. July. Area, 1, * 3, 4, 5. Not infrequent 

 in the county. Stems variable in length, according to the rapidity 

 of the stream, more or less branched, reddish. Leaves olive coloured, 

 pellucid, wavy. Peduncles rather short, thick, not smaller upwards. 

 Spikes oblong ovate. Flowers dense brown, with copious white 

 pollen. 



5. P. crispus, (Linn.) curly Pond weed. Engl. Bot. t. 1012. 

 Reich Icones, vii., 29, 30. 



Locality. In the Kennet and Avon Canal, streams, and ditches. 

 P. El. June. Area, 1, * 3, 4, 5. Not common in Wilts. Whole 

 plant submerged, of a bright green colour, tinged with red, waving 

 elegantly in the water. Root creeping. Stipules free, very broad 

 and membranous, clasping the stem, retuse, finally deeply laciniated. 

 Flowers yellowish green. 



6. P. pusillus, (Linn.) small Pond-weed. Engl. Bot. t. 215. 

 Reich Icones, vii. 22. 



Locality. In the Kennet and Avon Canal, ponds, and ditches. 

 P. El- June. Area, * * 3, 4, 5. Not infrequently distributed 

 throughout the county. Stem slender, compressed, very much branched. 

 Leaves long and very narrow, abruptly pointed, alternate, except 

 beneath the flower-stalks, where they are opposite. Peduncles 

 axillary, much longer than the small ovate four-flowered spikes. 

 Flowers brownish. Fruit roundish, ovate. The larger variety, P. 

 compressus of authors, has been observed in the neighbourhood of 

 Marlborough. Mario. Nat. Hist. Report. Chamisso and Schlech- 

 tendal unite P. compressus with P. pusillus. 



7. P. pectinatus, (Linn.) pectinate or Fennel-leaved Pond weed. 

 From pecten, a comb. The term pectinate refers to the narrow seg- 

 ments of the leaves. Engl. Bot. t. 323. Reich, Icones, vii., 19. 



Locality. In the Kennet and Avon Canal, ponds and streams. 

 P. El. June. Area, 1, * 3, 4, 5. Not uncommon in Wilts. Stems 



