POLYGONACE^. 87 



3. P. Fagopyrum.* L. (Buck Wheat.) 

 Cultivated land. 6, 7. 



Corn-field, Pinner Hill 1872. 



4. P. Convolvulus. L. (Climbing Buckwheat, Black 



Bindweed. ) 

 Corn-fields, t-9. 

 Wood End. 



5. P. amphibium. L. (Amphibious Red Persicaria.) 

 Margins of lakes and ponds. 7, 8. 



Canal, near Greenford, and Ruislip Reservoir. 



6. P. Persicaria. L. (Spotted-leaved Persicaria.) 

 Waste places. 7-10. 



Very common everywhere. 



7. P. lapathifolium. L. (Pale-flowered Persicaria.) 

 Fields and waste places. 



Occurs throughout the district. 



8. P. maculatum. Dyer. 

 Damp gravelly places. 7-9. 



Waste heap at Greenford, by the Canal, sparingly. 



9. P. Hydropiper. L. (Biting Persicaria.) 

 Sides of ditches. 8, 9. 



Very frequent. 



RUMEX. (Dock and Sorrel.) 



1. R. Hydrolapathum. Huds. (Great Water Dock.) 

 Ditches and river sides. 7, 8. 



Frequent by the side of the Canal. 



2. R. crispus. L. (Curled-leaved Dock.) 

 Way sides, and near houses. 6-8. 



