THE FLORA OF LONDON BUILDING-SITES 119 



made upon the Bloomsbury site, which will be referred to later, 

 suggests that the principal means by which these plants have 

 been introduced to our city is the rough forage given to horses in 

 their nose-bags, and that packing material only occasionally con- 

 tributes to this group of plants. 



Silene latifolia comb. nov. 2. Polygonum Persicaria L. 2, 4. 

 Melilotios officinalis LiSimsiYck. 2. P. Convolvuhis h. 2,4,5. 

 Trifolium repens L. 2, 5. Avena saliva L. (cultivated 



Matricaria inodora L. 2. form). 2, 3, 5. 



Plantago major L. 2, 3, 4, 5. Poa annua L. 2, 4, 5. 

 Atriplex imtula L. 2, 5. Pteris aquilina L. 3, 5. 



Bumex crisims L. 



Escapes from Cultivation. 

 The plants which are included under this heading are those 

 which have, most likely, been left from some villa garden, or have 

 germinated from kitchen refuse. Attempts at gardening are some- 

 times made even in city backyards. 

 Papaver somniferum L. (culti- Carum Petroselinum Benth. & 



vated form). Hook. f. (cultivated form). 



Brassica Napus L. (cultivated Ficus Carica L. (cultivated 



form). form). 



Baphanus sativus L. (cultivated 

 form). 2, 5. 

 A liverwort {Marchantia polymorpha) and two mosses [Funaria 

 hygrometrica and Bryum argenteum) were also found upon this site 

 (see site 4). 



2. The Site behind the British Museum, Bloomsbury. 



The clearance of this site was commenced some years ago, but 

 it was not finally levelled until January, 1910. The flora pre- 

 sumably commences from the latter date. The flora is very varied 

 for a site which had been levelled at so recent a date. 



Wind-distributed Plants. 

 Epilobium angustifolium L. 1, S. viscosus L. 1. 

 3, 4, 5. S. Jacohcea L. 1. 



Tussilago Farfara L. 1, 3, 4, 5. Carduus arvensis Eobson. 1, 

 Erigeron canadensis L. 1, 3,4. 3, 4. 

 Senecio vulgaris L. 4, 5. Sonchus oleracetis L. 5. 



Small-seeded Plants. 

 Capsella Bursa-pastoris Medi- Stellaria media Villars. 1, 5. 



kus. 1, 5. Polygonum aviculare L. 5. 



Coronoptis proctimbens Gilibert. 



Forage or Packing Plants. 

 The list of forage plants upon this site is a very long one, and 

 the following suggestion has been made to account for this large 

 variety. 



