ENUMERATION OF CONIFERS 175 



G. Apex of leaves obtusish, slightly incurved, 



their form triangular-ovate to oblong . . . Athbotaxis, 238 

 GG. Apex of leaves not or scarcely incurved, 



acutely mucronate or acuminate Sequoia {gigaiitea), 236 



FF. Leaf with prominent decurrent keel on back, 



incurved, with minutely serrulate margin. Taiwania, 237 

 EE. Branchlets flattened into broad leaf-like cladodia 



with minute scale-like leaves on the margin. Phyllocladus, 181 

 cc. Arrangement of leaves clustered or whorled, at least 

 partly so. 

 D. Form of leaves flat, deeply furrowed on both sides, 

 3-G inches long, in whorls of 15-35 at end of 



branchlets Sciadopitys, 232 



DD. Form of leaves needle-shaped, angled. 



E. The leaves in fascicles of 2-5, rarely to 8 or soli- 

 tary, surrounded at base by a sheath of scarious 



scales PiNUS, 295 



EE. The leaves many, clustered on short spurs .... Cedrus, 293 

 3. Leaves opposite or whorled. 

 c. Arrangement of leaves opposite. 



D. Form of leaves linear to oblong-ovate. 



E. Shape of leaves broad, oblong-lanceolate to ob- 

 long-ovate, rarely ovate, more or less 2-ranked. 



F. Leaf obtuse, oblong or oblong-lanceolate Agathis, 245 



FF. Leaf acuminate, ovate-oblong to ovate or el- 

 liptic-ovate PODOCARPUs(iVa^t) 181 



EE. Shape of leaves linear, decussate. 



F. Leaf obtuse to acutish, usually with glaucescent 

 or grayish bands beneath (juvenile forms of 

 genera of Cupressineae) . 

 G. Texture of leaves rather soft. 



H. Foliage light bluish-green or almost silvery- 

 white, very soft, violet in winter : 



branchlets spreading Chamcpcyparis pisifera 



HH. Foliage bright or dull green: branchlets var. squarrosa, 215 



more or less upright. 

 I. Upper surface of leaves bright green or 

 slightly glaucescent, with bluish 

 bands beneath, coloring violet or 



bro^vnish-red in winter ChamcEcyparis thyoidea 



n. Upper surface of leaves dull green, gray- var. ericoides, 213 

 ish-green beneath, changing to brown- 

 ish-green in winter Thuja occidentalis var. 



GG. Texture of leaves rather rigid, about }4 inch ericoides, 225 



long: compact roundish shrubs (see also 

 Cupressus macrocarpa var. Crippsii, p. 209). 



H. Leaves obtuse, bluish-gray Chamcocyparis obtusa 



var. ericoides, 216 

 HH. Leaves acute, bright or bluish-green. . . . Thuja orientalis var. 

 FF. Leaf acute, with 2' glaucescent or whitish lines decussata, 227 



above, green beneath Juniperus, 194 



DD. Form of leaves scale-like. 



