32 MASS. EXPERIMENT STATION BULLETIN 345 



inland, except in sheltered spots, plants of this species take to the outdoors in 

 gardens near the sea. This particular form has large deep heads of perfect 

 flowers ringed around by larger blue or white sterile blooms. If cut back in 

 spring and given ample food and moisture, the plant will have a pleasing 

 succulent aspect. 



HYDRANGEA PANICULATA Panicle Hydrangea 



This is the type plant of the much overdone "Peegee" Hydrangea, but differs 

 in that not all flowers are sterile and the resulting panicle is open and more 

 interesting. Old flower parts persist as in "Peegee." While perfectly hardy 

 and capable of being grown into a tree, such building up of woody framework 

 will be at the expense of size, but not number, of flowers. Thus, if grown for 

 individual flowers, it can well be pruned severely in spring. An excellent plant 

 for growing in large masses. Var. PRAECOX has about the same garden 

 value as the type but blooms six weeks earlier. Thought by some to be better 

 than the type. 



HYDRANGEA PETIOLARIS Climbing Hydrangea 



A close-climbing, slow-growing, deciduous root climber for masonry walls 

 or the trunks of otherwise worthless trees, capable of an ultimate spread of 

 seventy-five feet or more. Mature plants are lighted up in July by a loose, 

 whitish inflorescence with an outer ring of sterile flowers which persist in a dried 

 state throughout the autumn. Plants on walls are interesting in winter when 

 the rugged framework of brownish wood, close-hugged to the masonry, is 

 opened to sight. This species differs from Schizophragma hydrangeoides in tech- 

 nical details only. Garden aspect is about the same except that the latter 

 has poorer autumn effect. Both plants have been put forward by various 

 authors as being superior, but of the two the Hydrangea seems to be more 

 popular and to have greater garden distribution. 



HYPERICUM AUREUM GOLDEN St. JOHNSWORT 



A relatively small, stiff, dense, deciduous shrub with pale-green foliage 

 covered in July and August with bright-yellow flowers having prominent, 

 showy, yellow stamens. Can withstand a certain amount of shade. 



Hypericum Buckley! MOUNTAIN St. JOHNSWORT 



A compact shrub to about one foot, having upright and spreading stems, 

 bluish leaves, and small flowers. A plant for rock gardens or ground cover. 



Hypericum calycinum 



A somewhat tender-topped, evergreen species of little more than a foot high 

 which, because of its persistent leaves and relatively large yellow flowers, can 

 find a place in the rock garden. It has possibilities as a ground cover in warmer 

 sections. 



HYPERICUM KALMIANUM Kalm Hypericum 



A three-foot, narrow-leaved, hardy, deciduous shrub with smaller flowers 

 than H. aureum. It can withstand shade and dry soil conditions, and on such 

 situations could be used as ground cover. It has been suggested as material 

 for a hedge which will require no clipping. 



Hypericum prolificum SHRUBBY St. JOHNSWORT 



A deciduous shrub of variable habit but usually coarser than H. Kalmianum. 

 Mentioned here for possible wild planting because of its ability to withstand 

 both shade and soil moisture. 



