THE AMENTACE^ 



211 



bees and moths. The Poplars are of the Willow Order. 

 They include the Lombardy Poplar (Pofuliis pyrami- 

 dalis), the Black Poplar (P. nigra), the White Poplar 

 (P. alba), and the Aspen (P. tremula). Both Poplars 

 _and Willows favour temperate and cold latitudes. The 

 Oaks, as well as the Beeches, belong to the GupuUferce, 

 in which the sexes occur on the same plant, but not in 

 the same flower. In this 

 Order are the Common 

 Oak {Quercus Robur), the 

 Cork Oak {Q. Suber), and 

 the Common Beech {Fagus 

 sylvatica), the last being 

 a familiar forest tree in 

 Britain. Another species 

 of Beech, Fagus fenu- 

 ginea, is as familiar in 

 North America as F. syl- 

 vatica is in our own woods. 

 The Cupuliferse favour 

 temperate regions. Cas- 

 tanea vesca, 



Chestnut, a native of the 

 Mediterranean region, is 

 of the same Order. It has been introduced into Britain. 

 In the Birch Order (Betulacece) the sexes appear on the 

 same plant. The Order includes the Common Birch 

 {Betula alba), the Hazel {Corylus avellana, Fig. 67), the 

 Filbert {Corylus tubulosa), which grows in Italy, the 

 Hornbeam Garpinus betulus), and the Alder (Alnus 

 glutinosa. Fig. 68). The Betulacese favour Northern 

 regions. Willows and Birches are among the most 



Fig. 68.— Aujer. 



the Edible l, Branch with male (below) and fe- 

 male catkins ; 2, female flower ; 

 3, male flower. 



