142 CYPRESS, ETC. 



(a) Twigs short, much branched, compressed; 

 leaves with dorsal resin-glands. Cones 

 of a few erect, opposite, imbricated scales. 



Thuja gigantea, Nutt. Arbor Vitae. Bark cinnamon- 

 red, irregularly fissured and scaly. 



(/3) Twigs not flattened ; cones with peltate 

 scales. 



Cupressus sempervirens, L. Cypress. The Tamarisk 

 is the only other tree with closely crowded and imbricated, 

 grey-green scale-like leaves, and it differs in all but this 

 superficial resemblance from Cypresses and Arbora Vita? 

 e.g. the leaves are alternate, deciduous, and it is a 

 Dicotyledon, &c. 



[This type of closely appressed and crowded small 

 leaves on slender shoots is found again in the Heaths 

 (Erica, Calluna, &c.) and is sometimes termed EricoidJ] 



(2) Terminal bud often arrested; branching 

 irregular, not whorled; lateral buds normally 

 one in each leaf-axil; foliage leaves neither 

 linear nor very small or narrow. Trees and 

 shrubs with flowers, and true fruits contain- 

 ing seeds. 



(a) Buds, leaves and twigs opposite, 

 (i) Plant parasitic on various trees; buds 

 small, green, each in the angle between two 

 yellowish green opposite oblong leaves and 

 a terminal inflorescence. 



Viscum album, L. Mistletoe. The branches are 

 remarkable for their persistent smooth epidermis, and 

 perennial green colour. The roots extend in the cortex, 

 and are even invested by the wood, of the numerous trees 

 on which it occurs, among which Poplars, Hawthorn, 



