THE FLORA OF LONDON BUILDING-SITES 121 



folia, Fragaria, Polygonum cuspiclatuvi, and others which we 

 should expect upon the sites of town gardens, some interesting 

 economic and medicinal plants were found. These would indicate 

 that one of the houses was formerly occupied by a tenant interested 

 in economic botany. Amongst these, Carthamus tinctorius, a 

 plant largely cultivated in India as a dye material and for adul- 

 terating saffron, Artemisia Absinthium, Camelina sativa, an oil- 

 yielding plant, and Gardzius setosus, a variety of G. arvensis, which 

 is rare in Britain, and likely to have been planted by a botanical 

 student. 



Camelina sativa Crantz. Carthamus tinctorius L. 



Baphanus sativtcs L. (cultivated Artemisia Absinthium L. 



form). 1, 5. Carduus setosus Bab. 



Berteroa incana DC. CichoriiLm Intybus L. 



Fragaria (cultivated form). Atropa Belladonria L. 



Potentilla recta L. Polygonum cuspidatum Sieb. & 

 P. intermedia L. Zucc. 



Ampelopsis quinquefolia Michx. Ficus Carica L. (cultivated 

 CEnothera biennis L. form). 1. 



In addition to these groups of plants, Sisymbritim Irio, a 

 plant which appeared in great abundance after the great Fire of 

 London, and which has since appeared upon building-sites and 

 brickfields in the vicinity of London. This plant must be placed 

 in a group by itself. 



Sisymbritim Irio L. 



3. Upper Thames Street Site. 

 This site was formerly a wharf, and abuts upon the Elver 

 Thames and upon Upper Thames Street. It consists of a narrow 

 strip of ground, and Upper Thames Street being also a narrow 

 street, the carts used for removing debris are not likely to have 

 remained standing long. We should, therefore, expect the variety 

 of plants to be limited. Only eighteen plants were found. Ten 

 of these were wind plants, and one a small-seeded plant. This 

 latter was found upon a wall, and thus confirms the suggestion 

 that these plants may have been conveyed by birds. Only seven 

 forage and packing plants were found upon this site, and these 

 were quite as likely to have been introduced in packing material, 

 as by horses. 



Wind-distributed Plants. 

 Epilobium angustifolium Li. 1, Taraxacum officinale Wehev. 1, 



2, 4, 5. 5. 



E. montanum L. Sonchus arvensis L. 



Tussilago Farfara L. 1, 2, 4, 5. Salix [nigricans ?). 

 Erigeron canadensis L. 1, 2, 4. S. {caprea?). 1, 4. 

 Carduus arvensis Eobson. 1, 2, 

 4. 



Small-seeded Plant. 

 Cerastium vulgatitm L. 5. 

 Journal of Botany. — Vol. 50. [April, 1912.] k 



