108 CYPERACEjE. 



8. P. oblongus. Viv. (Oblong-leaved Pondweed.) 



Ditches, small streams, and ponds. 7, 



In a ditch at Harrow Weald Common, which is so 

 entirely covered by its floating leaves that you could not 

 possibly tell that water was underneath. 



ZANNICHELLIA. (Horned Pondweed.} 



I. Z. palustris. L. (Common Horned Pondweed.) 

 Stagnant pools, ponds, and ditches. 5-8. 

 Ponds at The Poplars, and Payne's Lane, Pinner. 



SUB-CLASS H. GLUMACE^E. 

 ORDER CVI. CYPERACE^E. (GALINGALE OR SEDGE TRIBE.) 



ELEOCHARIS. (Spike Rush.) 



1. E. palustris. Br. (Creeping Spike Rush.) 

 Sides of ditches and marshy places. 6, 7. 



Harrow Weald Common By the Canal, Alperton. 

 (Newbould.) By the Brent. (Lees.) 



2. E. acicularis. Sm. (Least Spike Rush.) 

 Moist or muddy ground. 7, 8. 



Ruislip Reservoir. 



This plant forms a green covering to the bottom of the 

 reservoir when the water is drawn off in a dry summer. 



3. E. fluitans. L. (Floating Spike Rush.) 

 Ditches and pools. 6, 7. 



Piece of open ground called Whitchurch Common, at 

 the back of Canon's Park, between Stanmore and Edgware. 

 1827-30. (Varenne.) 



