48 MASS. EXPERIMENT STATION BULLETIN 345 



their color, difficult to group, and their handling requires more consideration 

 than has been shown in the past. 



PIERIS FLORIBUNDA Mountain Andromeda 



A broad-leaved, native, evergreen shrub closely approaching Kalmia latifolia 

 in habit and aspect, but of smaller ultimate size and with smaller leaves. It 

 also differs from Mountain Laurel in having white " Lily-of-the- Valley " 

 flowers in somewhat erect panicles in late April or May. It is lighted up in 

 winter by the green buds of the following season's flowers. 



PIERIS JAPONICA Japanese Andromeda 



A broad-leaved, evergreen shrub which, compared to P. floribunda, is less 

 hardy, has glossier, more bunched foliage, and more drooping flowers, and will 

 where hardy make a larger plant. 



PINUS GEMBRA Swiss Stone Pine 



Though in old age this plant may break out into a round-topped, picturesque 

 head, it is usually seen in gardens in its slow-growing, densely pyramidal, 

 juvenile state. Its foliage, which retains a dark-green color throughout the 

 year, is borne on rather stiff, horizontal branches. A satisfactory tree for 

 limited areas if given sufficient soil moisture. 



Pinus densiflora var. umbraculifera 



This variety of the Japanese Red Pine is often seen as a small, low, flat- 

 topped plant resembling P. Abies Maxwellii in habit. In time, however, it 

 will take on a very open and picturesque aspect by becoming an eight- to ten- 

 foot shrub with half a dozen crooked, ascending, reddish-barked branches, 

 each of which is terminated by a flattened cluster of smaller stems. It can 

 probably be used to advantage only at the top of a very large rockery or on 

 rough, stony hillsides. 



PINUS KORAIENSIS Korean Pine 



Though listed as a tree capable of growing to a height of a hundred feet, 

 this species in gardens may be looked upon as a plant of pyramidal habit, 

 horizontal branching, and slow growth suitable for restricted situations. It 

 is a five-leaved pine somewhat more stocky in aspect and with darker foliage 

 than our native Pinus Strobus. 



Pinus mugo SWISS MOUNTAIN PlNE 



This is an exceptionally variable species (broken up by the botanists into 

 four general groups on the basis of cone characters) both in the wild and in 

 cultivation because of the fact that nearly all available stock has been grown 

 from seed. Numerous selections made at various times have been carried on 

 in a very limited way by means of vegetative propagation. Probably the 

 popular conception of the so-called Mugho Pine, and the thing which the 

 trade intends to sell as Pinus mugo var. M ughus, is a dwarf, rounded, or low- 

 growing plant. If such dwarf plants are wanted, one must secure vegetatively 

 propagated forms, such as var. compacta, the Hill Mugo Pine, or the variety 

 slavinii developed by the Rochester, New York, Park System, or take his 

 chance on being able to select desired forms from large blocks of seedling plants. 

 It is a welcome host to the pine leaf scale. 



Pinus nigra AUSTRIAN PlNE 



When young, this variable species is a rather regular, quick-growing plant 

 with long, stiff needles. As it grows toward maturity, it reaches out rather 

 dark, heavy, irregular branches in a grotesque but not altogether unpleasant 



