70 MASS. EXPERIMENT STATION BULLETIN 345 



TILIA CORDATA LlTTLE-LEAF EUROPEAN LlNDEN 



A tall, deciduous tree which is capable of growing to an ultimate height of 

 one hundred feet. Interesting because of its relatively small, two and a half 

 inch, heart-shaped or rounded leaves and very late fragrant flowers. 



X TILIA EUCHLORA Crimean Linden 



A fast-growing, pyramidal hybrid of less ultimate height, but with leaves 

 larger and more lustrous than those of T. cor data. Now being used as a street 

 tree. Not generally attacked by aphids. 



TILIA TOMENTOSA SlLVER LlNDEN 



A neat-appearing, hundred-foot, deciduous tree of somewhat upright 

 branching habit, which gets its common name from the white, woolly under- 

 surfaces of its five-inch leaves. Being resistant to drought, it is used for street 

 planting or as specimens. 



X TILIA VULGARIS Common Linden 



This hybrid of T. cordata and the wider-leaved T. platyphyllos builds up 

 into a very large, broad, symmetrical, shade tree having dull-green, five-inch 

 leaves. Considered by many as the Linden most suitable for specimen use. 



Trailing Arbutus — See Epigaea 



Tripterygium Regelii 



A half-climbing, deciduous shrub resembling a shrubby plant of Celastrus 

 when not carrying its large panicles of white flowers in midsummer. Useful 

 in dry situations. 



Trumpetcreeper — See Campsis 



TSUGA CANADENSIS Canada Hemlock 



One of the important trends in present-day gardening is the deepening 

 appreciation for eastern American Hemlocks. As seen in sun or shade on acid 

 soil areas in the native landscape, their garden value compares most favorably 

 with that of any of the exotic conifers. Their garden forms, taken together 

 with those of the Yew, can well be made the basis of many fine plantings. 

 Seedlings of the Canada Hemlock, if selected for uniformity of foliage and 

 habit, stand with the Yew and just ahead of the Arborvitae as material for 

 making clipped hedges. Left unpruned, type plants may also be used as 

 specimens and in tall groupings or screens. 



Of the seventy or more varieties and habit forms of this species now in cul- 

 tivation, the following sorts stand out as being representative of its several 

 garden expressions: Var. ATROVIRENS, of slow growth and broad habit, 

 has deep-colored foliage arranged on the numerous, somewhat rigid branchlets 

 in such a manner as to give an effect of rigidity and compactness. "Kelsey's 

 Weeping Variety," unlike the common weeping form, develops a more pronounced 

 main stem from which the branching is more definitely pendulous. Var. 

 MACROPHYLLA resembles the type in habit but differs from it in having 

 larger, broader leaves. Var. minima is a very slow-growing bush for the rock 

 garden. Var. pendula (Sargent's Weeping Hemlock), with horizontal 

 branches and drooping branchlets, builds up into a compact bush of some- 

 what greater width than height. 



TSUGA CAROLINIANA Carolina Hemlock 



A tree of somewhat smaller stature and more compact habit than the Canada 



Hemlock. If used on cool, moist, well-drained soil, it has greater ultimate 



cultivated value than the usual type plants, but not of some of the varieties, 



