240 SOUTH AFRICAN FLOWERING PLANTS. 



name to a family, Myricacece, containing only this 

 single genus. 



The introduced trees are the following : — 



The Poplar (Po'puhcs) ; species of the Willow (Sa'lix), 

 of which there is one native species, >S'. capen'sis, with 

 a silky-leaved variety (hirsu'ta). 



These two genera make up the order Salicacece, 



The Walnut (Jug'lans re'gia) represents another 

 order, Jnglandacece, with five genera. 



The Oak and edible Chestnut represent the order 

 Cupuliferce, or "cup-bearers," in allusion to the cup 

 of the acorn and prickly covering to the chestnuts. 

 This order has ten genera in three tribes. It contains 

 400 species, scattered over the north temperate regions 

 of the whole world. Four only are British, the Oak, 

 the Beech, the Hazel, and the Hornbeam. 



Sa'lix. — The willows are dioecious. The male tree 

 has its flowers in a dense elongated catkin. Each 

 flower consists of two or more stamens only in the 

 axil of a bract. The female tree has its flowers also 

 in catkins, each flower consisting of a pistil of two 

 carpels. The seeds have a tuft of silky hairs at one 

 end. 



Quer'cus. — The Oak, familiar to all in the Peninsula, 

 has been long introduced (Fig. 94). A is a young 

 branch with three slender " interrupted " male catkins, 

 i,e. there are marked intervals on the peduncle between 

 the flowers. Each consists of a gamosepalous calyx of 



