568 EVEBGREEN TREES AND SHRUBS. 



The Pygmy Arbor-Vit^, Bio^a o. pygnicea, is the smallest of all 

 the species, and of a rich dark-green color. 



Siebold's Arbor-Vit^. Biota o. nana. — A round compact 

 dwarf of a bright green color. 



The Nepal Arbor-Vit^. B. gracilis {B. nepalensis). — Form 

 about the same as that of the American arbor-vitae. Foliage more 

 delicate, and of a darker green. Quite hardy. The specimen 

 from which we formed our opinion of this species was in Parsons' 

 specimen ground at Flushing. Hoopes describes it as having a 

 light-green color ; the one we observed (in the month of Septem- 

 ber) was darker than either the American or the Siberian, which 

 were growing near by. 



, The Broad-leaved Arbor- VitjE. Thuiopsis dolobrata. — A new 

 variety from Japan of strong growth. The branches are fastigiate, 

 but drooping at their extremities and forming rather an open head. 

 The foliage is a dark-green above and gray or " silvery " beneath. 

 It is a very popular tree in China and Japan, where it reaches a 

 height of forty to fifty feet, and is also much esteemed in England ; 

 but has not been cultivated long enough among us to test its 

 hardiness. It is said to do best in shaded places and moist soil. 



THE CYPRESS FAMILY. 

 Cupressus, Taxodium, Glypto-strobus, Retinispora. 



The evergreen species of cypress, famous in old British and 

 Continental grounds for their cemeterial associations, their slow 

 growth, great longevity and final size, are the types of the true 

 cypresses or cupressus of the botanists Our native swamp white 

 cedar, and some of the evergreen cypresses of California are classed 

 under the same botanical head. The American deciduous cypress 

 is named by botanists, Taxodium ; and the new deciduous species 

 from China are classed separately under the name Glypto-strobus. 

 Another class known as Japan cypresses are classed, botanically, 

 under the title Retinispora. 



