SISOK 239 



Bucks.] Wargrave, Melvill in Britt. Contr. Near the ' Dread- 

 nought,' Sonning, also in Sonning Cutting, Tufnail. Near 

 White Waltham. 

 Varum segetum occurs in all the bordering counties. 



SISOK", Linn. Gen. n. 311. 



S. Aznomtiin, Linn. Sp. PI. 252 (1753). Stone Parsley. 



Top. Bot. 190. Syme, E. B. iv. 106, t. 578. Nyman, 305. Fl. Oxf. 138. 



Native. Septal. Hedge-banks, on clayey or calcareous soil. Locally 



abundant. B. July-October. 

 First record. Sunninghill, Sir Joseph Banks in Herb. Brit. Mus. about 

 1773. Sison amomurn, Dr. Noehden, Maror's Agr. Berks, 1809. 

 Sison Amornum, which occurs in all the bordering counties, is 

 a common plant of Berkshire, so that its localities are not enumerated. 



SIUM, Linn. Gen. n. 310 (Tournefort, Inst. t. 162). 



S. latifolium, Linn. Sp. PI. 251 (1753), and of C. Bauhin. Cheat 

 Wafer Parsvep. 



Top. Bot. 192. Syme, E. B. iv. 117, t. 587. Nyman, 304. Fl. Oxf. 137. 



Native. Paludal. Kiver-, brook-, and canal-sides. Locally common- 

 It occurs at intervals on the banks of the Thames, from its 

 entrance into the county to its leaving it for Surrey. P. July- 

 September. 



First record. Pastinaca aquatica latifolia. At Oxford, July 5, 1622, 

 J. Goodyer, MS. Also Sium majus latifolium, Ger. By Redding, 

 [How's] Phyt. Brit. 1650. 



1. Isis. Ditches about Radcot Bridge, Fardon in Bot. Guide, 1805. 



(This record is transferred to S. eredum by error in Mavor's Agr. 

 Berks.) Not \incommon near Oxford, Baxter in Purt. Midi. Fl. 

 Near Buckland. Appleton. Bablock Hythe. Under Wytham 

 Woods, &c. 



2. Ock. Ditches below Blewbury Common, Lousley in RusselVs Cat. 



By the Canal near Wantage. Uffington. Marcham. Abingdon, 

 very hixuriant. By the Thames near Oxfoi'd. Kennington. 

 Radley. Culham. Sutton Courtney. Wittenham. Walling- 

 ford, &c. 



3. Pang. Moulsford. Pangbourn. Tilehurst. Reading. 



4. Kennet. Northcroft, Russell's Catalogue. '^Not seen by me.) 



5. Loddon. About Reading, [How's'] Phyt. Brit. In the largest pond 



at foot of Cookham Down, Mill. Ditches by the Thames above 

 Maidenhead, J. Woods in Winch add. to New Bot. Guide. Wargrave. 

 Sonning, Melvill in Britt. Contr. Aston, &c., Stanton. Windsor, 

 Everett. Near Eton, Gotobed in Bot. Guide. Near Boulney and 

 Shiplake, very fine. 



