HERBACEOUS PLANTS 133 



leaves, is another choice subject for planting 

 when smoke and chemical fumes are present 

 in the air. Two species at least of the Knot- 

 weed or Snakeweed (Polygonum) do well 

 under similar conditions, these being P. bis- 

 torta with pinky flowers, and P. Brtmonis. 



RUDBECKIA NEWMANII with its plentifully 

 produced yellow flowers and dark centres is 

 also of value for town gardening, and this 

 may also be said of Statice Tartarica, which 

 produces dense heads of pinky flowers. 



T^ALICTRUM AQUILEGIFOLIUM, with its 



large plume-like white flowers, and the variety 

 rubrum, with rosy-pink flowers, have both done 

 well in a London garden for several years. 

 They like good, yellow, dampish loam. 

 Generally, hairy-leaved plants are not suited 

 for planting where dust and soot abound, but 

 exceptions will be found in the MULLEINS 

 (Verbasctim), quite a number of which are 

 excellent town plants. V. Olympicum and V. 

 Blattaria are perhaps two of the best. 



YUCCAS are well suited for planting in smoky 

 localities, particularly when soil and site are 



