THE FLORA OF LONDON BUILDING-SITES 117 



Lateral cymes closely sessile 21. B. Thonneri. 



Branchlets and exterior of corolla quite glabrous 



22. B. glabrata. 

 Corolla-tube about 1*5 cm. or more long. 



Leaves oval-oblong 23. B. montana. 



Leaves narrow-oblong 24. B. retrofracta. 



Stipules seldom exceeding 1*5 cm., — usually much less. 

 Bracteoles inconspicuous or absent, at least in the fruit. 



Kipe berries 9 mm. x 8 mm 25. B. sicbsessilis. 



Kipe berries 5 mm. in longest diameter. 



Lateral leaf-veins 7-8 pairs, prominent 26. B. (cthiopica. 



Lateral leaf-veins 4-5 pairs, not prominent 27. B. tenuiflora. 

 Bracteoles apparent, filiform, exceeding the calyx. 

 Berry many-seeded. 

 Leaves glabrous or sparsely pubescent above ... 28. B. gracilis. 

 Leaves hispidulous above, with densely pilose midrib 



29. B. cinereo-viridis. 



Berry few (6-8-) seeded 30. B. oligosjjerma. 



Inflorescence capitate or subcapitate. (CAPiTATiE.) 

 Fruits not exceeding 5 mm. in diameter. 



Inflorescence subcapitate, relatively lax, shoots and leaves 



glabrous 31. B. Laurentii. 



Inflorescence a close capitulum, stem sericeo-tomentose 



32. B. globiceps. 

 Fruits upwards of 1 cm. in diameter, with elongated pedicel 



33. B. capitata. 

 (To be continued.) 



THE FLOEA OF LONDON BUILDING-SITES. 

 By J. C. Shenstone, F.L.S. 



An account which attracted some attention from the Press of 

 a collection of wild plants found upon a building-site in Farringdon 

 Street was contributed by the writer to the Selhorne Magazine of 

 October, 1910. It appeared likely that similar collections, made 

 upon other building-sites in the City and West End of London, 

 might afford information as to the means by which the seeds of 

 plants are conveyed to central positions of this large city. 



Visits have been made during the past summer to a large space 

 behind the British Museum in Bloomsbury, a site abutting upon 

 Upper Thames Street, a site in Eussell Street, Covent Garden, 

 and a site at the corner of St. John's Street and Aylesbury Street, 

 Clerkenwell. 



The plants collected upon the above sites have been grouped 

 in the following lists, in order to ascertain the most likely means 

 by which their seeds were distributed. Some of the plants might 

 have been included in more than one of the groups into which the 

 lists are divided, but the evidence was carefully balanced in each 

 case, and the plant placed in the group to which it appeared to 

 belong. 



The numbers which follow the plant names in these lists refer 

 to the other sites upon which the plants have been found, as 

 follows : — 



