176 THE CULTIVATED EVERGREENS 



E. Branchlets terete or quadrangular. 



F. Leaves of vigorous branches not distinctly de- 

 cussate and often only subopposite Widdringtonia, 230 



FF. Leaves always distinctly opposite and de- 

 cussate. 

 G. Margin of leaves entire or sometimes fringed; 



leaves occasionally ternate Jtjniperus, 194 



GG. Margin of leaves minutely fringed or den- 

 ticulate; leaves always opposite Cupressus, 207 



EE. Branchlets flattened (rarely quadrangular in 

 Chamsecyparis and leaves with entire margin). 

 F. Width of branchlets }4 inch or less. 



G. Margin of leaves fringed CuPRESStrs, 207 



GG. Margin of leaves entire. 



H. Internodes longer than broad; branchlets 



bright green on both sides Libocedrus, 220 



HH. Internodes of short branchlets about as 

 long as broad; branchlets often with 

 whitish markings beneath. 

 I. Branchlet-systems usually not dis- 

 tinctly frond-like; branchlets less than 



3*5 inch broad Cham^cyparis, 211 



n. Branchlet-systems distinctly frond- 

 like; branchlets js - i inch broad, 



much flattened Thuja, 221 



FF. Width of branchlets |-^ inch, with white 



markings beneath Thujopsis, 218 



cc. Arrangement of leaves whorled (see also Athrotaxis, 

 p. 238). 

 D. Number of leaves in whorl 3. 



E. Form of leaves linear to lanceolate or oblong- 

 ovate. 

 F. Shape of leaves oblong-ovate, incurved at apex, 

 about 3^ inch long, with white bands beneath, 



green above Fitzrota, 227 



FF. Shape of leaves linear to lanceolate, with white 

 bands above, green beneath, usually rigid 



and spiny-pointed Juniperus, 194 



EE. Form of leaves scale-like. 



F. Whorls of leaves close Juniperus, 194 



FF. Whorls of leaves, at least on leading shoot, 



remote; leaves minute Callitris, 228 



DD. Number of leaves in whorl 4, whorl remote; 



branchlets compressed Tetracunis, 230 



aa. Plants with deciduous foliage. 



B. Shape of leaves flabellate, 2-3 inches across at apex Ginkgo, 177 



BB. Shape of leaves linear. 



c. Leaves alternate and usually 2-ranked Taxodium, 233 



cc. Leaves in clusters on short spurs. 



D. Width of leaves ^ inch or more, 1^-3 inches long . . Pseudolarix, 288 

 DD. Width of leaves narrower, not exceeding 13^ inches 



long Larix, 289 



