234 PLANTING THE ORNAMENTAL GROUNDS 



Wild alder, A. serrulata* 



Dwarf birch, Betula pumila.* 



Desirable for low places. 

 Ailanthus, Ailanthus glandulosus. 



Most attractive when cut to the ground each year and allowed to 

 sprout (Fig. 157). The young shoots give a tropical effect. For this pur- 

 pose the soil should be very rich. 



Paulo wnia, Paulownia imperialis. 



Of this and the following magnolias, the tops are not hardy, and they 

 should be used in the same manner as the ailanthus. 



Magnolias, Magnolia Umbrella and cordata. 



Hop -tree, Ptelea trifoliata* 



Prickly ash, Zantlioxylum Americanum.* 



Bladder-nut, StapJiylea trifolia.* 



Horn-beam or Blue beech, Carpinus Americana.* 



Iron -wood, Os try a Virginica* 



European Bird Cherry, Prunus Padus. 



A small tree much like the choke cherry, but a freer grower, with 

 larger flowers and racemes which appear about a week later. 



Choke Cherry, P. Virginiana* 



Very showy while in flower. 

 Ksempfer's Catalpa, Catalpa Kcempferi. 

 Flowering crab, Pyrus floribunda. 



Pretty both in flower and fruit. A large shrub or small tree. Various 

 forms. 



B. Coniferous Evergreens. 



Dwarf arborvitse, Thuja occidentalis, hort. var. 



There are many dwarf and compact varieties of arborvitae, most of 

 which are excellent for small places. The most desirable for general 

 purposes, and also the largest, is the so called Siberian. Other very 

 desirable forms are those sold as globosa, ericoides, Hoveyi and pyra- 

 midalis. 



Japanese arborvitse or retinospora, Eetinospora of various 

 species. 



Very attractive small plants, of which the following nursery forms 

 appear to be hardy in Central Michigan : R. squarrosa, R. pisifera, 

 R. plumosa, R. obtusa. There are various varieties of these. 



