TJMBELLIFER^, 121 



III, In a shallow pool of water by the highway side on Hounslow Heath 



near the town's end, and in pools of water about Thistleworth ; 



R. Cat. i. 285. In one of the ponds near the road at Hayes, three 



miles from Uxbridge, gathered once by Dr. Wilmer ; Blackst. 



Spec. 92. 



First record: Bay, 1670; last, 1763. Confined to the western side of 



the county in the Colne and Cran districts, where it seems to have 



died out. Can some other plant have been mistaken' for it ?] 



APIT7M, Lmn,. 



268. A. grraveolens, L. Wild Celery. Stnallage. 

 Cyb. Br. i. 429 ; Comp. 187. Syme E. B. iv. t.. 572. 



Ditches where the water is brackish, also on walls washed by such water ; 

 very rare. P. June — September. 

 VII. Edge of ditch in the Isle of Dogs, near the timber-dock, 1866. 

 Ibid. 1869!; Warren, In Tower ditch, and on the walls; on a 

 wharf-wall at Millbank ; (in the crevices of the tombs in Pancras 

 churchyard ;) M. # G. 429. 

 First record : Milne and Gordon, 1793, One of our few semi -maritime 

 species. The last locality appears improbable. Mr. Lees records it 

 (V.) at Grreenford, and bet. Perivale and Herrow, but it must there be 

 of garden origin, 



PETEOSELINUM, Hoffm. 



P. sativum, Hofm. Cyb. Br. i. 429. Syme E. B. iv. t. 576. III. Old 

 garden wall at rear of houses in Hog Lane ( = Crown St.), Harrow, 

 now nearly extinct ; Melv. 33, A garden escape. 



269. P. segretuxn, Koch, 



Slum arvense seu segefum, J. B. H. (Blackst.). Sison segetum, L. (Forst.), 

 Cyb. Br. i. 430 ; iii. 440 ; Comp. 187, Syme E. B. iv. t. 577. 

 Damp fields ; very rare. A or B. August, September. 

 VII, [In the brickfield adjoining to Tyburn turnpike, 1744 ; Blackst. 



Spec. 92.] [About Hampstead Heath, Hyde Park and Tothill Fields ; 



Forst. Midd.] Isle of Dogs!, 1836; Herb, Young. Abundant and 



very large by the side of a ditch near the timber-dock in the Isle 



of Dogs, 1866. Ibid. 1869!; Warren. 

 First record: Blackstone, 1744. Perhaps Sison Amomum -was mistaken 

 for this in the stations given in Forster's Middlesex list. 



HELOSCIADIUM, Koch. 



270. H. nodlflomm, Koch. 



Sium umhellatum repens, Ger. em. (Blackst.). Stum nodiflorum, L. 



(G. & R). 

 Cyb. Br. i. 431 ; Comp. 188. Syme E. B. iv. t. 573. 

 Ditches and sides of streams ; common. P, July — September, 



