326 



OF THE SHRUBS 



Picea. The SPRUCES are in the main tall tree-like evergreens with 

 nrci lie-like 4-an-led leaves usually \ to 1| inches long, attached to a 

 grooved twig on brownish projections. The readiness with which the 

 leaves fall from the severed twigs and the roughness of the twigs, due to 

 these projecting points, are the best distinctions for separating spruces 

 from other cone-bearing plants. The commonest species in cultivation 

 in this country is the NORWAY SPRUCE Picea Abies (P. exce"lsa), and of 



% 



FIG. 587. Sargent's Weeping 

 Hemlock. 



FIG. 588. Hovey's Arborvitae. 



the many varieties sold there are several that grow more like a shrub than 

 a tree. Among these varieties are : GREGORY-'S DWARF SPRUCE (58(i) 

 Gregoryana, seldom more than 1 to 2 feet high with numerous small, 

 spreading branches densely clothed with short stiff spreading leaves ; 

 SMALL NORWAY SPRUCE pumila, a dwarf with a more conic form and 

 with glaucous leaves spreading in all directions from the branches; PIGMY 

 SPRUCE pygmasa, with leaves very small, close set and sharp-pointed; 

 and LORD CLANBRASIL'S SPRUCE Clanbrasiliana, a dense globose or 

 rounded shrub seldom 5 feet high, all parts much shortened and close set. 



[Seeds ; twig cuttings ; layers.] 



Tsuga. The HEMLOCKS are generally trees with short, \ inch, flat, 

 blunt leaves having two silvery lines on the lower side. These leaves are 

 so twisted on the twigs as to extend in two directions from them, giving 



