POTENTILLA 1 93 



linked together by a chain of intermediates. Moisture does not appear 

 to be a necessary factor in producing variations. 

 P. Anserina occurs in all the bordering counties. 



P. argentea, Linn. Sp. PI. 497 (1753). Tormentil, Cinquefoil. 



QuinquefoUum folio argenteo, C. B. Pin. 325. 

 Top. Bot. 132. Syme, E. B. iii. 151, t. 435. Nyman, 224. Fl. Oxf. loi. 

 Native. Glareal. Eoadsides and hedge-banks on sandy soil in sunny 



places. Very local and rather rare. P. June-July. 

 First record. Hoary Cinquefoil, Dr. Noehden. Meadows, pastures, &c., 

 on a gravelly soil, Mavor's Agr. Berks, 1809. 



2. Ock. Near Besorsleigh [Besilsleigh] in the fields towards 



Abingdon, MS. in Britt. Contr. About Marcham, Walker. By 

 the railway at Didcot, but evidently introduced with other 

 casuals in this locality. 



3. Pang. Bradfield, Jenkinson. Near Cold Ash Common. 



4. Kennet. Ashwood Green, Weaver. Between Newbury and Cold 



Ash Common. 



5. Loddon. Near Marlow, Mill in Phyt. i. 986, 1843. (Probably in 



Bucks.) Hedge-bank near Lucas' Hospital, Wokingham. By 

 Bulmarsh Park, near Early, near a footpath. Old brickfield, 

 Wellington College Grounds, Penny. By Loddon Bridge, 

 Tiifnail. Gravel pit near Bray Wick. By roadside near 

 Maidenhead. Plentiful in a gravelly lane between Coleman's 

 Moor and Twyford. 

 Where P. argentea occurs Dianthiis Armeria, Carum segetum, Caucalis 

 nodosa, and Arahis perfoliata should be looked for. 



P. argentea is recorded for all the bordering counties except Glouces- 

 tershire, but it is very rare in Oxfordshire. 



P. palustris, Scop. Fl. Carn. ed. 2, i. 359 (1772). Purple Marsh Cinquefoil. 

 P. Comarum, Nestl. Mon. Potent. 36 (1816). Comarum palustre, Linn. 

 Sp. PL 502 (1753). Pentaphyllum rubrum palustre, Gerard, 836 (1597). 



Top. Bot, 134. Syme, E. B. iii. 153, t. 437. Nyman, 222. Fl. Oxf. loi. 



Native. Paludal. Boggy places. Very local and rare. P. June- 

 August. 



First record. Comarum palustre, Kev. C. W. Penny and Mr. H. Eeeks 

 in JSn^. Contr. 187 1. 



4. Kennet. Marshy and boggy meadows about Kintbury, Reeks, I. c. 



5. Loddon. Heath Pool, near Wellington College, Penny, I.e. ! 

 Our plant is the sub-glabrous, not the densely hairy form, the var. 



villosa, S. F. Gray, which I have seen in Anglesea. 



P. palustris is recorded for Surrey, Hants, and Wilts, and has been 

 recently found by Mr. L. Lester, M.A., between Oxford and Woodstock 

 in Oxfordshire. 



O 



