104 ROSACEA. 



224. R. arvenslSf Huds. 



Cyh. Br. i. 358 ; iii. 422 ; Comp. 164. Syme E. B. iii. t. 476. 

 Heaths, borders of fields and hedges ; common. Shrub. June, July. 

 I. Harrow Weald Common. Stanmore Heath. South Mims. Harefield!; 

 Newb. 

 II. "West Drayton ! ; Newh. Tangley Park. 



III. Near Isleworth. Bet. Twickenham and Worton. 



IV. Hampstead ; Irv. MSS. Bishop's Wood ! ; Warren. 



V. Bet. Turnham Green and Acton ! ; near Twyford ! ; Newb, Near 



Lampton. 

 VI. Edmonton. Hadley ! ; Warren, 



VII. [Marylebone fields, 1815; Herb. G. # i?.] South Heath, Hamp- 

 stead. 

 First record: Merrett, 1666. Rosa canina sylvestris unico flore et 

 fructit, found in the fields bet. Hackney and London ; Merrett, 105, and 

 in Bishop's Wood, Mr. Martyn ; R, Syn. iii. Indie. plant, dub. is referred 

 by Hudson to this species. 



CRAT^GUS, Linn, 



225. C. Oxyacanttaa, L. Hawthorn. May. White Thorn. 

 Oxyacanthus, Ger. em. (Blackst.). 



Cyb. Br. i. 364 ; iii. 424 ; Comp. 167. 



1. C. oxyacanthoides, Thuill, 



a obtusata, DC. (Macreight). Syme E. B. iii. t. 479. 



Woods and hedges ; rather rare. Small tree. May, 



1. Near Euislip. 



II. Hedge near Staines. 



IV. Abundant in Bishop's Wood, Hampstead. 

 V. Near Apperton ! ; Hanwell ! ; Newb. Horsenton HiU. 



VI. About Tottenham ; Macreight, 74. Plentiful in Enfield Chase ; Syme 



E.B. iii. 2ZQ. Near Hadley in several places ! ; Warren. 



2. C. monogyna, Jacq. 

 Syme E.B. iii. t. 480. 



Heaths, woods and hedges ; very common. Tree or shrub. May, June. 



Common in all the districts, but generally planted as a quickset hedge. 

 There are however, very old thorns in (II.) Bushey Park, on (III.) 

 Hounslow Heath, and by the river side bet. Twickenham and Eichmond 

 Bridge, and (IV.) on Hampstead North Heath ; which are doubtless of 

 spontaneous growth. 



First record : Johnson, \&Z2. A form with the leaves more deeply and 

 narrowly cut was noticed by Dillenius about London ; E. Syn. iii. 454. 

 A large-leaved form is recorded by Buddie as Oxyacanthus folio et 

 fructu majore lately observed by Mr. Petiver not far from the boarded 

 river ; Budd. MSS. With dark pink Jiowers ; near the canal bridge, 



