COMPOUND FLOWERS 



16] 



artists love to introduce this plant into the foregrounds of their 

 pictures, thereby obtaining a somewhat obvious effect of picturesque- 

 ness. Waste places ; common. Fl. July, August. Biennial. 



Some other varieties have been described, of which the most 

 distinct are A. majus, A. minus, and A. tomentosum. Their charac- 

 teristics, however, are not very definite. 



Arctium Lappa 

 (Common Bur-dock) 



Serratula Tinctoria 



(Common Saw-wort) 



15. Serratula (Saw-wort) 

 I. S. tinctoria (Common Saw-wort). The only British species. 

 A slender plant, 1-2 feet high, with a stiff, erect, angular stem, 

 slightly branched above, deeply cut and serrated leaves ; and small 

 terminal heads of purple flowers in a corymb ; the outer scales of 

 the involucre are smooth and close pressed, the inner tinged with 

 purple. Pastures ; frequent. Fl. August. Perennial. 



16. Saussurea 

 1. 5. Alpina (Alpine Saussurea). The only British species. 



The 



stem is from 8-12 inches high ; the leaves cottony beneath ; flower- 

 heads of light purple florets, in a dense terminal corymb, fragrant. 

 Mountains in the north ; rare. Fl. August. Perennial. 



17. Carduus (Thistle) 

 1. C. nutans (Musk Thistle). Heads solitary, drooping ; scales 

 of the involucre tapering to a rigid point, cottony, the outer ones 



