Fig. 119.— CHENOl'ODIUM liaNUS-HENRICUS. 



CHAPTER VI. 



INCOMPLET.E. 



Of this sub-class we have in Britain representa- 

 tives of fifteen orders, some of them very numerous 

 and important. To it, for instance, belong many of 

 our forest trees, such as the elm, oak, beech, birch, 

 poplar, willow, pine, fir, &c. ; and a large number 

 of the common herbs, such as the nettles, cheno- 

 podiums, euphorbias (spurges), &c. The flowers, 

 however, are generally less conspicuous (see Fig. 119) 

 than those we have hitherto been considering, and 

 offer fewer adaptations in relation to insects ; being 

 in many cases wind-fertilised : thus in H. Miiller's 

 work, less than ten pages are occupied by this whole 

 sub-class, of which more than half are devoted to the 

 Polygonaceae, and a greater part of the remainder to 



