222 CUPRESSINE.^. [part i. 



The male flowers and the female flowers are dis- 

 tinct, but on the same tree. The male catkins 

 are small cones, with the pollen inclosed in four 

 cases that are attached to the inside of the scale, 

 near its base. The female catkins consist of 

 six scales, with two ovules at the base of each ; 

 and the ripe cone has a sharp point project- 

 ing from each scale. The seeds have scarcely 

 any wing ; and when they germinate, they have 

 only two cotyledons. The young plants send 

 down a very long tap root (see Jig. 99), and 

 have some of their leaves imbricated and others 

 loose. The Chinese Arbor Vitae ( T. orientalis) 

 seldom reaches the height of 20 feet, but it may 

 be also distinguished from the preceding species 

 by its more dense habit of growth, by its 

 branches being turned upwards instead of 

 spreading horizontally, and by its leaves being 

 smaller, closer together, and of a lighter green. 



THE GENUS CALLITRIS. 



Callitris is a genus separated from Thuja, 

 of which only one species is as yet common in 

 British shrubberies. This is the Gum Sanda- 

 rach-tree, formerly called Thuja articulata^ but 

 now named Callitris guadrivalvis. The branches 

 of this tree are articulated, that is, they may 

 be broken off at the joints without lacerating the 

 bark. The leaves are very small, quite flat, 



