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ORDER LXXX. ALISMACEiE. 
ALISMA. 
1109. A. Plantago, Linn. Native. British. 
1110. A. ranunculoides, Linn. Native. British. 
1111. A. natans, Linn. Incognit. 
Reported doubtfully by Teesdale, (B. G., 685), from the lake at 
Hornsea. 
SAGITTARIA. 
1113. S. sagittifolia, Linn. Native. English. 
BUTOMUS. 
1114. B. umbellatus, Linn. Native. English. 
TRXGLOCHIN. 
1115. T. mamtimum, Linn. Native. British. 
1116. T. palustre, Linn. Native. British. 
SCHEU CHZERIA. 
1117. S. palustris, Linn. Native. Scottish. 
This species still grows at the old station at Leckby Carr ; but 
may easily he overlooked by those unacquainted with the locality. 
ORDER LXXXI. FLUVIALES. 
POTAMOGETON. 
1118. P. denses, Linn. Native. English. 
Ponds and slow streams ; not unfrequent in low situations. 
1119. P. pectinatus, Linn. Native. British. 
In similar situations ; not unfrequent. A maritime form grows in 
the saltwater ditches in the Coatham and Middlesborough marshes. 
1119c. P. elabellatus, Bab. Native. English. 
In the fen ditches between Hull and Hedon — Rev. W. W. New- 
bould,fide C. G. Babington, (Phyt., iv. 1160). 
1120. P. pustllus, Linn. Native. British. 
Ponds and slow streams ; frequent. 
