88 LEMNACE.E. POTAMOGETONACE^E. 



LEMNACE^E. 



LEMNA Linn. 



1. L. minor Linn. Duckweed. 

 Bab. 349. Hook. 477. Benth. 488. 



On stagnant water. A. June, July. 

 Common. 



POTAMOGETONAOE^. 



POTAMOGETON Linn. 



1. P. natans Linn. Pondweed. 

 Bab. 350. Hook. 484. Benth. 492. 



Ponds and still waters, P. June, July. 

 Commonly distributed. 



2. P. perfoliatus Linn. Perfoliate Pondweed. 



Bab. 352. Hook. 481. Benth. 493. 



Streams and ditches. P. July. 

 I. In the Canal. 



3. P. crispus Linn. Water Caltrops. Frog's Lettuce. 



Bab. 352. Hook. 481. Benth. 493. 



Ditches and pits. P. June. 



I. Pond near Ivy's Farm. III. In the Kennet near 

 Hillcot Mill. 



4. P. densus Linn. Small Water Caltrops. 

 Bab. 354. Hook. 479. Benth. 494. 



Ditches. P. June, July. 

 III. In the Kennet near Hillcot Mill. 



