52 MASS. EXPERIMENT STATION BULLETIN 345 



or grafts of true terminal shoots should be used. To be of value, it is best used 

 as an isolated specimen. 



PSEUDOTSUGA TAXIFOLIA (P. Douglasii) DOUGLAS FlR 



The Colorado expression of this western timber tree, although not too much 

 at home in New England, has been used extensively for large screens and other 

 situations suitable for towering Spruces and Firs. It is a gawky, unsymmetrical 

 plant while very young and as a result young plants have often been sheared 

 into shape. Such trimmed specimens have too often been ineptly substituted 

 for slower-growing material, only to grow out of hand in subsequent seasons. 

 Then, too, close shearing of seedling plants usually makes for crippled lower 

 branches as the plant approaches maturity. Here is a plant which seems to 

 vie with Taxus and Tsuga for large screens or hedges in shady places. Seedling 

 blocks of Douglas Fir show considerable variation, and in Europe numerous 

 varieties have been determined on the basis of color or growth habit. 



Pyxidanthera barbulata 



A low, creeping, evergreen shrub of the east coast pine barrens. Of interest 

 in moist, sour, rockery spots because of its mat of fine leaves and spring-borne 

 white flowers. 



QUERCUS ALBA WHITE Oak 



Though lacking in spectacular features as a young plant, this familiar native 

 tree, with its stocky bole and heavy-branched, far-spreading crown, forms in 

 maturity one of the distinctive features of our landscape. It is of value as a 

 specimen tree. Long-established plants are difficult to transplant. 



QUERCUS BOREALIS (Q. rubra) Northern Red Oak 



A native tree which in the wild varies in stature and habit according to 

 differences in soil and degree of crowding to which it is subjected. As a speci- 

 men on deep soil, it can become one of the tallest of our oaks, with a broad top 

 and nearly erect main branches. Its lustrous, sharp-lobed leaves turn red in 

 autumn. 



QUERCUS COCCINEA Scarlet Oak 



A more easily transplanted, native, deciduous tree which does well in lighter, 

 drier soils, and at maturity spreads out a broad open head some eighty feet in 

 height. Its deep-cut leaves change from the bright green of summer to brilliant 

 scarlet in autumn. 



QUERCUS IMBRICARIA ShINGLE Oak 



A useful sixty-foot tree of deep soils which grows up through a juvenile 

 pyramidal habit to become a round-topped mature specimen. Its narrow 

 shining leaves — unlobed, unlike those of most other Oaks — turn a reddish 

 brown in autumn. 



QUERCUS PALUSTRIS Pin Oak 



A straight-trunked tree some sixty feet or more in height, having small, 

 sharp-lobed leaves and a characteristic downward slant to its lower branches 

 which terminate in somewhat pendulous twigs. Though thought of as a plant 

 for moist land, it will develop numerous leaders and quickly spread out a broad 

 low crown if the water table is too high. Here is a most satisfactory street or 

 park tree for any area of deep soil. 



QUERCUS ROBUR var. FASTIGIATA Fastigiate English Oak 



Made fine-textured by small, rounded-lobed leaves, and columnar in aspect 



by the erect habit of its branching, this plant is a superior alternative to the 



