44 MASS. EXPERIMENT STATION BULLETIN 345 



or as a very large, upright shrub. Its garden value depends to some degree 

 on the July-borne drooping panicles of white flowers, but more on the scarlet 

 autumn color of the leaves. Old plants taken from the wild must, as a rule, 

 be cut to the ground and the top regrown. It can withstand some shade. 



PACHISTIMA CANBYI 



This foot-high, American, evergreen shrub has its branches covered with 

 inch-long, persistent leaves. A superior plant for massing as ground cover in 

 well-drained areas, or for specimen plants in rock gardens. It can withstand 

 the light shade of open woods. 



PAGHYSANDRA TERMINALIS Japanese Spurge 



A familiar, low, creeping, ground cover which fills up to form neat, level 

 masses of shining green foliage. It is really satisfactory in shade only. Also, 

 it can withstand drought but needs a fairly deep soil which has not been usurped 

 by the fine roots of such trees as Maples. For such situations an occasional 

 top-dressing of loam or compost is necessary. 



PAEONIA SUFFRUTICOSA TREE PeONY 



Though capable of building up a woody framework a yard or so through, 

 this species and its varieties bloom better, and remain more symmetrical, if 

 kept low through annual removal of older wood to ground level. Thus treated, 

 they remain plants for the herbaceous border or for the low edges of shrubberies. 

 Varietal plants grafted on the woody type or on herbaceous roots are sure to 

 give trouble in the way of foreign suckers or disease. Own-root plants are 

 immeasurably superior. As a result of long cultivation, hundreds of varieties 

 are offered and selection becomes a matter for personal taste. 



Pagoda-Tree — See Sophora 



Parthenocissus quinquefolia var. Engelmannii ENGELMANN CREEPER 



A somewhat refined form of the Virginia Creeper. A coarse, deciduous vine 

 which climbs vigorously over walls, tree trunks, and ledges. The five-parted 

 leaves take on brilliant scarlet autumn coloration. Bluish-black fruits in 

 September and October. 



PARTHENOCISSUS TRICUSPIDATA (Ampelopsis Veitchii) 



Japanese Creeper (Boston Ivy) 

 While not generally hardy north of Boston, this popular, vigorous but neat 

 appearing, deciduous vine has few equals for wall covering, especially under 

 city conditions. Brilliant autumn foliage coloration. Fruits blue-black in 

 early autumn. Var. lowii, Geranium Creeper, is small leaved with fine 

 stems and scattered foliage which is brilliant in autumn. A satisfactory cover 

 for low, rough masonry. 



Partridge-Berry — See Mitchella 



Peach — See Prunus 



Pearl-Bush — See Exochorda 



PENTSTEMON SCOULERI 



This one-foot plant of dense habit is one of the best of the several woody 

 Pentstemons which find a place in rock gardens. It has relatively large, lilac 

 flowers in midsummer. 



Periwinkle — See Vinca 



