290 NAIADACE. 
T2. Canal at Spondon and Borrowash, Painter, C.D. & Natt. Breadsall, 
Crewe & Whittaker. Thrumpton Ferry; Sandiacre ; Sawley. 
T3. Burton-on-Trent; Canal at Willington, Painter, J.B. d& Natt. Repton, 
Wild Fl. Rept. Brook above Egginton. 
P. crispus JL. 
Native. BE. Streams, canals, ponds, ditches. Common. P. July-Aug. 
First record, Glover, 1829. 
Generally distributed ; in all the districts. 
Var. serratus (Huds.). 
T2. Canals between Derby and Borrowash. 
T3. R. Trent by Drakelow. 
P. crispus x perfoliatus. P. Coopert Fryer. B.E.C. Rep. for 1900, 
1901. 
T2. Canal near Chaddesden. 
P. crispus x Friesii. P. Lintoni Fryer. 
C. Canal near the Hague, Renishaw, 1899. This interesting hybrid was 
detected by Mr. Alfred Fryer, of Chatteris, on specimens of Mr. Waterfall’s 
submitted to him (Watson’s B.H.C. Rep., 1900). 
P. densus lL. 
Native. E. Shallow ponds, streams, and ditches. Rare. P. July-Aug. 
First record, Glover, 1829. 
G2. Cromford; canal at Whatstandwell, Milnes, C.D. 
P. Near Nether Langwith; pools east side of Scarcliffe Park Wood. 
Tl. Osmaston Lake, near Ashbourne, Smith MSS. 
T3. Near Calke Abbey, Purchas, J.B. Old Trent, Repton, Weld Fl. 
Rept. 
P. zostereefolius Schum. 
Native. E. Canals, slow streams. Not uncommon. P. July-Aug. 
First record, Watson’s N.B.G., 1835. 
L. Matlock, Miss Armitage. 
G2. Canal and reservoirs, Cromford, Bailey, C.D. 
C. Canal near Shipley Gate. 
Tl. Findern, Bindley. 
T2. Canal, Borrowash, Smith MSS. Spondon, Painter, Natt, Thrumpton 
Ferry ; canal, Long Eaton, and Sandiacre. 
T3. Swarkeston; Melbourne Pool, Purchas, J.B. KR. Trent, near Burton, 
Hb. Mason! Calke, Blozxam. Drakelow, Painter, J.B. Willington Canal, Rept. 
BE & Fy, 
P. obtusifolius Mert! §¢ Koch. P. granineus Sm. 
Native. EB. Canals, old ponds. Very rare. P. July-Aug. 
First record, The Flora. 
C. Sparingly in the canal, near Killamarsh, 1897. 
P. Small pond above the Great Pond, Hardwick. 
