OENANTHE 245 



1. Isis. Buckland Park. Marsh in Tubney Wood, Boswell. Wytliam 



meadows. In the meadows near Eynsham. Near Buscot. 



2. Ock. Marcham, Walker. Radley, Fl. Oorf. Uffington. Abingdon 



meadows, common. Wantage. Kennington. 



3. Pang. Pangbourn. Moulsford. Near Tilehurst. 



4. Kennet. Wash Water, BusselVs Cat. 1839. Burghfieid meadows, 



Tnfnail. Greenham Common. Southcote. Catmore. Beenham. 



5. Loddon. Ponds at the foot of Cookham Down, Mill. Sandhm-st, 



Penmj. Culham. Aston. Hurley, Stanton. Wargrave, Melvill. 



Sonning, Tufnail. Near White Waltham. Coleman's Moor. 



Windsor Park. Ruscombe. Twyford. Old Windsor. Bisham. 

 The plant is rather variable in habit ; it occurs near Abingdon 

 as the large form (var. luxurians, Crepin, Notes PI. Rares. de la Belg. 

 fasc. iv. 1864), It is fond of still or stagnant water, and is usually 

 associated with Hydrocharis, Lemnu, Callitriche obtusangula, and Stellaria 

 palustris, and is more frequent in the county than the foregoing 

 records show. 



Oe. fistulosa occurs in all the bordering counties. 



Oe. silaifolia, Bieb. Fl. Taur. Cauc. iii. 232 (1808). Sulphur Wort. 



Oe. peuceclanifolia, Pollich, Hist. PI. Palat. i. 289 (1776). Oe. Smithii, 

 H. C. Wats, in Phyt. ii. (1845) 14. 



Top. Bot. 196. Syme, E. B. iv. 126, t. 595. Nyman, 298. Fl. Oxf. 135. 

 Native. Pratal. Wet, low-lying meadows. Local. P. June-July. 

 First record. Oe. peucedani/oUa. Several places about Oxford, Dr. Sib- 



thorp in E. B. t. 348, 1796. Near Eton, Mr. Gotobed in Bot. Guide, 



1805. 



1. Isis. Eynsham meadows. Wytham meadows. 



2. Ock, Thames meadows, Dyer. Iffley fields. Kennington 



meadows. Near Sandford. 



3. Pang. Near Pangbourn, Newhould. 



5. Loddon. Moist meadows near Eton, Gotohed. 



In the Nouvelle Flore de la Normandie M. Corbiere separates Oe.iJeucedani- 

 folia from Oe. silaifolia, the latter being distinguished by its glaucescent 

 tint, and by the ripe fruit being sub-tetragonous-cylindric. In the 

 former the fruits are narrowed above and below, and the plant is not 

 glaucescent. They are treated as synonymous in Index Kewensis. 



Oe. silaifolia is recorded for all the bordering counties, but recent 

 confirmation of its occurrence in Bucks and Hants is desirable. 



Oe. Ziaclieualii, Gmel. Fl. Bad. i. 678 (1805). 



Oe. pimpinelloides, Sm. E. B. t. 347, not of Linn. 

 Top. Bot. 195. Syme, E. B. iv. 127, t. 596. Nyman, 298. Fl. Oxf. 135. 

 Native. Uliginal. Rough meadows, marshes, and bogs. Very local. 

 P. July- September. 



