174 THE CULTIVATED EVERGREENS 



FF. All the leaves subulate, sometimes partly scale- 

 like. 

 G. Base of leaves quadrangular or laterally flat- 

 tened, usually keeled above. 

 H. Branches in regular whorls, spreading, 

 forming distinct tiers; lateral branch- 

 lets approximately in one plane Araucaria, 241 



HH. Branches more or less irregularly whorled; 



the lateral branchlets not in one plane. 



I. Leaves stiff, pungent, strongly laterally 



compressed, passing into scale-like 



leaves on mature plants: branchlets 



pendulous on young plants Taiwania, 237 



n. Leaves rather soft, not pungent, of one 



kind: branchlets not pendulous Cryptomeria, 239 



GG. Base of leaves flattened horizontally, concave 



or flat above, passing into scale-like leaves. Sequoia (gigantea) 236 

 EE. Winter-buds distinct, covered with imbricate 

 scarious yellowish to blackish scales, often resi- 

 nous: leaves articulate at base, not decurrent 

 into a green leaf-cushion, linear or needle-like. 

 F. Branchlets smooth or nearly smooth after fall 

 of leaves which leave a roundish scar: leaves 

 with stomatic bands only beneath or stoma- 

 tiferous on both sides. 

 G. Upper surface of leaves with raised midrib, 



flat: winter-buds small, not resinous Keteleeria, 246 



GG. Upper sm-face of leaves grooved or flat, or 

 these sometimes quadrangular. 

 H. Leaf -scars not raised: winter-buds short, 

 ovoid, and usually resinous (in one 

 species elongated and leaves spiny- 

 pointed, 13^-23^2 inches long) Abies, 248 



HH. Leaf -scars slightly raised at lower end: 

 winter-buds elongated, pointed, not 



resinous Pseudotsuga, 263 



FF. Branchlets roughened after fall of leaves by the 



stalk-like processes of the leaf-cushions which 



are separated by incised grooves. 



G. Leaf quadrangular or flattened and with 



stomatic lines on all sides or only above, 



often spiny-pointed, with 2 or more lateral 



resin-ducts Picea, 269 



GG. Leaf flattened and with stomatic bands 

 beneath, sometimes convex above and with 

 stomatic lines above and beneath, never 

 spiny-pointed, with one resin-duct under 



the midrib Tsuga, 265 



DD. Form of leaves scale-like or sometimes scale-like and 

 linear on the same plant. 

 E. Branchlets terete or angled. 

 F. Leaf not or obtusely keeled. 



