112 FLOWERING PLANTS. 



L. polyrrhiza, L. Greater Duck-weed. Flowerless in England. 

 Frequent : pond near Harleston Common ; ditch near 

 Alburgh Wood ; Shotford Bridge Dykes ; Dickleburgh. 



ALISMACE^]. 



ALISMA, L. 



A. PlantagO, L. Greater Water Plantain. 7 9. Common 

 by the side of streams and in ditches and ponds. 



A. ranunculoides, L. Lesser Water Plantain. 6 8. Not 



common : marshy ground near Wingfield Castle, C. 

 Needham Alder Carr Meadow, F. Scole and Hoxiie 

 (JC). 



SAGITTARIA, L. 



S. sagittifolia, L. Common Arrow-head. 7 9. Abundant 

 in the Waveney and its ditches. 



BUTOMUS, Tour. 



B. umbellatus, L. Flowering Bush. 6, 7. Not infrequent: 



Shotford Dykes ; Mendham Mill ; Flixton Marshes ; 

 Stow Fen, Earsham ; Dickleburgh ; Scole ; Shimpling ; 

 Hoxne. 



NAIADACE M. 



TRIGLOCHIN, L. 



T. palustre, L. Marsh Arrow-grass. 7, 8. Frequent : marshes 

 of the Waveney at Hoxne, Needham and Weybread. 

 Boggy ground, St. Margaret's (EAH). 



POTAMOGETON, L. 



P. natans, L. Floating Pondweed. 5 7. Common in ponds, 

 ditches, and streams. 



P. rufescens, Sch. Ruddy Pondweed. 6, 7. Not common : 

 Dickleburgh Moor ; pond near Rushall Wood ; Shimp- 

 ling, F. Billingford, Pulham Mary (T). River near the 

 Bridge at Scole (FB). 



P. heterophyllus, Sch. Different-leaved Pondweed. 6, 7. 

 Rare : slow water, Dickleburgh (TS). 



