86 POLYGONACE^E. 



Occurs as a weed in neglected ground, such as near the 

 Roxborough turnpike, etc. 



3. A. angustifolia. Bab. (Spreading Narrow-leaved 



Orache.) 



Waste ground. 7-10, 



Corn-fields at Wood End. Gardens and road sides at 

 Pinner. 



4. A. erecta. Huds. (Upright Spear-leaved Orache.) 

 Corn-fields. 7-10. 



Wood End ; Northolt and Woodhall, Pinner. Horsing- 

 ton Hill. (Flor. Midd.) 



ORDER LXXI. SCLERANTHACE/E. (KNAWEL TRIBE.) 



SCLERANTHUS. (Knawel.) 



I S. annuus. L. (Annual Knawel.) 

 Corn-fields. 7, 8. 

 Pinner. Harrow Weald Common. (Flor. Midd.) 



ORDER LXXII. POLYGONACExE. (PERSICARIA TRIBE.) 



POLYGONUM. (Persicaria, Knot Grass, Buckwheat, 

 and Bistort.) 



1. P. Bistorta. L. (Common Bistort, or Snakeweed.) 

 Moist Meadows. 6-9. 



On the inner grassy slope of the Moat at Headstone, 

 Pinner. Terrilands, Pinner. Near Ruislip Reservoir. 

 (Flor. Midd.) 



2. P. aviculare. L. (Common Knot Grass.) 

 Waste places and way sides. 5-9. 

 Abundant. A very variable plant. 



