SCIENCE-GOSSIP. 



223 



CASUAL AND ALIEN PLANTS IN NORTH LONDON. 



By J. E. Cooper. 



HPHE following lists are no: regarded by 

 any means complete, still they may be of 

 interest as a contribution towards the casual flora 

 of North London. The plants here noted have all 

 come under my own notice during the last fourteen 

 years. During this period there has been a good 

 deal of building in progress in this neighbourhood, 

 and the land from time to time left waste has 

 produced the greater number of the plants here 

 nerated. 



The distinction between "casuals" and "aliens" 

 is often arbitrary. In this, as in the nomenclature 

 generally, the "London Catalogue "(ninth edition) 

 is taken as a standard list. 



As far as I know, all these plants have been 

 introduced, and are not found truly wild in this 

 neighbourhood. They seldom reappear in any one 

 spot after the first year, being generally crowded 

 out by other and stronger species. 



I am indebted to Mr. J G Baker, of Kew, for 

 kindly naming some of the aliens. 



Casuals. 



Rjxuncuius arvtnsis. L. East Finchley. 

 ErysiwuiM .huranthoides, L. East Finchley and 

 Crouch End. 

 taxis tenuifolia, DC. East Finchley. 



. L. Crouch End (two localities). 

 . L. Crouch End and Muswell Hill. 

 Ounthus anuria, L In a wood at East Finchley 

 (Possibly indigenous, not seen for several years 

 no-.. 

 SUcne '... Crouch End 



Scop. In several waste spots. 

 nsis, L. Highgate and Crouch End. 

 Rhamnus catkartuus, I. Fast Finchley; a single 

 bush, probably planted. 



nticulata, Willd Crouch End 



I. Colney Hatch Lane. 



L Higl 

 '. L. Colney Hatch I 

 Stokes If 

 Stnt 1 ate 



I ; 

 Alt (1 ■ Had :■■ >. J. 1 1 .. • I 



: mi:uu:. 1. 



Highgal 



C. muralt, L. Muswell Hill. 



C. urbicum, L. Hampstead and Crouch End. 



Polygonum dumetonun, L. Muswell Hill and Crouch 



End. 

 Rumex maritimus, L. Crouch End (two localities). 

 Mercurialis annua, L. Crouch End. 



urus myosuroides, Huds. Crouch End (two 



localities). 



a spit -.".', Beauv. Crouch End. 



Aliens. 

 Delphinium ajacis, Reichb. Crouch End. 

 Alyssum incamtm, L. Muswell Hill and Crouch 



End. 

 -i. maritimum, L. Crouch End. 

 Erysimum perfoliatum, Crantz. Crouch End. 

 Camdina sativa, Crantz. Crouch End (two 



localities). 

 Raphistrum rugosum. Crouch End (two localities). 

 Saponaiia vaccaria, L. Crouch End (two localities). 

 Linum usitatissimum, L. Highgate and Crouch 



End. 

 Oxaiis corniculata, L. Muswell Hill. 

 Impatiens parviflora, D. C. Hampstead and Crouch 

 End. 



itus alba, Desr. Crouch End. 

 Trifolium hybridum, L. East Finchley and Crouch 

 End. 



— — (sp. not yet identified). 

 Carum carvi, L. Crouch End. 



. n canadense, L. Highgate. 

 Ambrosia trifida. Highgate. 



\go armaria, Waldst. and Kit. 

 Amarauthus retroflexus, L. East 



Crouch End. 

 Cannabis sativa. Crouch End. 



ernus, All. Colney Hatch. 

 Panicum crus-galli, L. Highgate and Crouch End. 

 P. miliacium, L. Muswell Hill and Highgate. 

 P. capillar!, L. Crouch End. 

 Stt.uia guinea, Beauv. Muswell Hill, Highgate 

 and Crouch End. 



i :eauv. Hiyhfiate and Crouch End. 

 ■ >itnsis,L. Crouch Fnd (two local 



ABN' I I MS. 



The following abnormal specimens have- >l 

 occur: 



L., with foliaceous calyx, at 

 Crouch End. 



\utumna .1 . • ll I li 1 blos- 



soms, at Muswell Hill 



I. A plai 

 three peduncli bore a 



hi minlatui mmil 



Crouch End. 



Crouch End. 

 Finchley and 



