24 MASS. EXPERIMENT STATION BULLETIN 345 



X Deutzia rosea var. campanulata BELLFLOWER 



A hybrid of D. gracilis which has larger, more open flowers than the parent 

 species. The growth rate and habit of both are much the same. 



Deutzia scabra var. Watereri 



A straight-stemmed, rough-leaved, deciduous shrub which is capable of 

 growing to a height of seven or eight feet. Its single white flowers are carmine 

 outside and open in late May or early June. Probably the hardiest of the 

 taller-growing Deutzias. 



Diapensia lapponlca 



A small-leaved, evergreen shrub of alpine summits which develops few-inch 

 tufts and has white flowers in early summer. Adaptable for some rock gardens. 



diervilla Florida var. venusta (Weigela rosea venusta) Pink Weigela 

 The hardier and more desirable form of the well-known, old-fashioned Pink 

 Weigela, which makes a vigorous, symmetrical, deciduous shrub up to ten 

 feet or so in height, and in June is covered with rosy-pink flowers. It has given 

 way recently to the somewhat hardier and more graceful Kolkwitzia amabilis. 

 All members of this group have a number of insect enemies and also are apt to 

 be somewhat unkempt in appearance after the passing of the flowers. 



X Diervilla hybrlda WEIGELA 



Numerous crosses of Diervilla florida with other species have given some fine, 

 June-flowering garden shrubs which generally are not fully top-hardy through- 

 out New England. The full color range of these varieties is given by the 

 following varieties: "Abel Carriere" has purple-carmine buds which open into 

 rose-carmine flowers; "Candida," where perfectly hardy, is one of the best white- 

 flowering varieties; "Congo" has freely borne, purplish-crimson flowers; 

 •'Eva Rathke" makes a rather scraggly, upright plant covered by deep carmine- 

 red flowers in late May or early June. 



Diervilla Lonicera DWARF BUSH-HONEYSUCKLE 



A two- to three-foot, native, deciduous shrub of somewhat herb-like aspect 

 which, when planted in masses, can light up open, dry, rocky roadside areas 

 with its yellow midsummer flowers. 



Diervilla praecox EARLY WEIGELA 



A somewhat smaller and less ornamental shrub than D. florida var. venusta, 

 which is included here because of its early-May, showy, purplish-pink or rose- 

 carmine flowers. 



Diervilla sessilifolia SOUTHERN BuSH-HoNEYSUCKLE 



A native of the upper South which is suitable for mass planting on rough 

 banks. More gross in every detail than D. Lonicera. 



DIRCA PALUSTRIS LEATHERWOOD 



A slow-growing, medium-sized, pliable-stemmed, native, deciduous shrub of 

 open, sunny areas. Garden value is based on its early, pale-yellow flowers. 

 Adapted to roadside or other natural development. 



Dogwood — See Cornus 



DRYAS DRUMMONDII 



A prostrate, creeping, evergreen shrub with leaves which are dark green 

 above and white, woolly beneath. When happy, it spreads out to form a rock- 

 garden ground cover from which in spring rise numerous yellowish flowers. 



