298 POLTGONACE^. 



613. p. Rail, Bah. Bay's Knotgrass. 



Native ; on sandy or shingly shores on the coast and by estuaries. 

 Rather common. June to October, 

 c. I. Seaton ! ; //ore, Kei/s, FL iii. 213. Downderry. 



11. Whitsand Bay, hi the sand ; Kei/s, Phyt. iii. 1022 ; seen near 

 Rame Head. 

 D. V. Wembury. By Bigbury Bay, at Wadham, sparingly, 1875. 



Yl. About the Erme estuary, on the Kmgston side ; and also near 



Pamflete, and just below Efibrd. 

 First record : Keys, 1850. 



614. P. Hydropiper, L. Water Pepper. 



Native ; in muddy spots by roadsides, and about ditches, ponds, 

 and pools. Very common. August to October. Area general. 

 Occurs not only in the enclosed country, but also about pools on open 

 commons. 



The seeds of this are sometimes destroyed by a minute fungus, looking 

 like the ' smut ' of wheat. 



615. P. Persicaria, L. Common Persicaria. 



Native ; in waste spots, by roadsides, and in cultivated ground. 



Very common. July to October. Area general. 



A variable species. Sometimes the flowers are very light pink ; more 



rarely they are of a bright purplish-red colour. A plant with white ones, 



close to another, near Longbridge, September, 1877. Occasionally there 



are a few stalked glands on the perianth. 



h. elatum, E. B. ed. 3. 

 c. II. Among weeds in a field at Trevol, near Torpoint, with Setaria 

 viridis, and one or two aliens ; so probably sprung from seed 

 brought in some way or other to the spot, September, 1876. 

 The name confirmed by Dr. Boswell as the plant of English 

 Botany. It is scarcely sufficiently marked to constitute even 

 a variety. Some luxuriant forms of the species met with else- 

 where might perhaps also do for var. elatum. 



616. P. lapathifolium, L. Glandular Persicaria. 



Native ; in damp waste ground, and as a weed in arable fields 

 and on manure heaps. Common. July to October, 

 c. I. Sheviock. 



II. Antony. Anderton. 

 D. III. Between Pennycomequick and Prospect. Honicknowle. Between 

 Plymouth and Saltash Passage. Cultivated ground by the 

 Tavy. 



