170 MASS. EXPERIMENT STATION BULLETIN 267 



Ostrya viryiniana, American Hophornbeam. A small hardy native tree of 

 considerable interest but not reconimended for general landscape planting. 

 More satisfactory in the margins of woods or in ravines, under partial .shade. 



Oxydendrum arboreum, Sourwood. This fine southern species is not quite 

 hardy in Amherst. 



Pachysandra terminalis, Japanese Pachysandra. A dwarf hardy grouncj 

 cover now well known. Grown for many years on the campus with utmost 

 satisfaction. Especially adapted to shaded situations, such as under trees. 



Paulownia tomentosa, Royal Paulownia. A coarse tree with large, strik- 

 ing foliage, much resembling catalpa, and with large trusses of beautiful 

 showy purple flowers. Unfortunately this species is not entirely hardy here 

 but kills back rather frequently. Occasionally it can be brought into blossom. 

 Even when cut back from year to year the strong young shoots with large 

 foliage have considerable ornamental value. 



Phellodendron amurense, Amtjr Corktree. A fine, dignified tree, native of 

 China and Japan, represented on this campus by one young specimen only. 

 This seems to be hardy, clean, and desirable. 



Phellodendron sachaliuense. Sakhalin Corktree. A good-sized tree, native 

 of Korea and northern Japan, with corky bark, striking pinnate foliage, 

 flowers attractive but not conspicuous. Several good specimens, one of large 

 size and striking beauty, have long shown the liardiness and adaptability of 

 this species. It is, in fact, one of the most effective and desirable of exotic 

 trees in the entire collection. The flowers produce an abundance of nectar, 

 making the tree a most desirable one for the apiarist. 



Philadelphus coroiKirius, Sweet Mockoraxge. This fine, old-fashioned shrub 

 does well in this locality. Perhaps tlie large-flowering variety {yrandlflorus) 

 is to be preferred, and indeed it is the one most frequently offered by the 

 nurseryman. In -general the plant needs considerable pruning to kee]i it down 

 to the ground and prevent the formation of tall, leggy stems. 



Philadelphus lemoinei, Le.moine Mockorange. A very fine hybrid sort, good 

 habit of growth with relatively small leaves and iiigiily floriferous. \A'ell worth 

 general planting. 



Philadelphlus puhescens. Hoauy IVIockoraxge. A strong-growing, lusty, 

 hardy S])ecies useful in mixed plantings. It has much tlie same ornamental 

 values as P. coronarius. 



Photinia villosa, Photinia. A large shrub attaining a height of fifteen feet, 

 can be trained to tree form, with good dark green foliage. The clusters of 

 small white flowers are quite attracti\c. '^I'he al)imdance of bright red fruits 

 makes this a strikingly attractive plant in autunui. 



Phy.socdrpus bracteutus, Twinpod Ninehark. A rather compact, medium- 

 sized shrub, flower clusters much resembling spirea and j^roduced in abun- 

 dance. The light green leaves strikingly like those of the garden gooseberry. 

 It has proved to be perfectly hardy. 



Physocarpus intermedins. Illinois Nixehauk. \'cry mucli like tlie preced- 

 ing but of somew hat larger growth and of etiua! hardiness. 



Physocarpus opulifolius, Common Nixekark. A strong, coarse-growing na- 

 tive shrub, adaptable for large coarse masses and where a rapid filler is 

 needed. A varietv with golden-vellow leaves is not so good. 



