424 POLYGONACEAE 



4. Kennet. On the borders of a small coppice between Tilehurst 



and Reading. 



5. Loddon, Near Sandhurst on the fence of a garden, but I think 



native. 

 P. dumetorum is recorded for Surrey, Hants, and Wilts ; and the 

 Rev. F. H. Woods has found it near Chalfont in Bucks. 



P. aviculare, Linn, Sp. PI. 362 (,1753). Common Knot-grass. 

 Top. Bot. 356. Syme, E. B. viii. 64. Nyman, 639. Fl. Oxf, 258. 

 Native. Agrestal, &c. Cultivated and waste ground, road-sides, 

 gardens, heaths, about field-jjaths, &c. Abundant and universally 

 distributed. A. or B. June-October. It ascends to the top of 

 Walbury Camp, 957 feet. 

 First record. Sonning, a specimen of var. rurivagum, Mr. S. Budge, 

 in Herb. Brit. Mus. 1800. P. avicidare, Mavor's Agr. Berks, 1809. 

 From the various kinds of situations in which it grows and its 

 wide distribution it is necessarily found under many modifications. 

 Sj'me described the Jordanian species which are recorded for Britain 

 as varieties, but they by no means represent the series of variations. 



Var. AGRESTiNUM (Jord. in Boreau, Fl. du Centre Fr. ed. 3, ii. 559, 

 as a species). P. aviculare, Linn. Herb. Syme, E. B. viii. 64. 



This form is common and generally distributed in cultivated ground. 

 Var. vuLGATUM, Syme, I.e. 65, t. 1229, 

 P. aviculare, Boreau, Fl, du Centre Fr. 1. c. 559. 



Common on waste ground, roadsides, footpaths, &c,, as on Boar's 

 Hill, &c. The older name for this is var. hrevifolium, S. F, Gray, Nat. 

 Arr. ii, 271, based on Polygonum, hrevi angustoque folio, Ray, Syn. 146 

 (specimen in Herb, Oxf,). 

 Var, ARENASTRUM (Boreau, 1, c), as a species, Syme, 1. c. t. 1230. 

 Waste ground, cornfields, evincing a preference for sandy soil. 

 1. Isis. Wytham. Cumnor. Faringdon. Coleshill. Longworth. 

 2. Ock. Boar's Hill. Kennington. Cole's Pits. Besilsleigh. 

 Abingdon. Tubney. 3. Pang. Tilehurst, Tufnail. Moulsford. 

 Frilsham, Bradfield. Basildon, 4, Kennet. Theale, Greenham. 

 Kintbury, Hungerford. Snelsmore. Reading, 5. Loddon. 

 Sonning. Wokingham. Maidenhead. Bracknell. Hurley. 

 Var. rotund if olium, S. F. Gray, 1. c, which is based on Pohjgonum folio 

 rotundo, Pet. Herb. Brit. 10. 2 vide specimen in Herb. Oxf.), is the 

 older name, 



Var, mcRosPERMUM (Jord, in Boreau, 1, c, 560, as a species). 

 Syme, E. B. viii. 66. Apparently rare in sandy soil. 



4. Kennet. Mortimer, Tufnail, 1895. Padworth. 



5. Loddon, Wargrave, Melvill. Near Maidenhead, Clevver, 

 Var. RURIVAGUM ,Jord. in Boreau, 1. c, 560, as a species). 



Syme, E. B, viii. 67. t. 1231. 



