^ CHINESE ECONOMIC TREES 



II. Leaves evergreen. 



A. Fruit maturing in. 2 or rarely 3 seasons; leaves needle-shaped, 

 in clusters of 1-5 inclosed at the base by a sheath ; cone scales 

 woody, much longer than the bracts Pinus. 



B. Fruit maturing in 1 season. 



1. Cones pendulous, the scales persistent. 



a. Branchlets roughened by the persistent leaf bases; 

 leaves deciduous upon drying; bracts shorter than the 

 cone scales. 



(1) Leaves sessile, 4 sided, stomatiferous on all 4 sides 

 or somewhat flattened and stomatiferous above. 

 Picea. 



(2) Leaves stalked, flattened and stomatiferous below 

 or somewhat angular Tsuga. 



b. Branchlets not roughened by the persistent leaf bases; 

 leaf stalked, flattened; aristate bracts longer than the 

 scales Psevdotsuga. 



2. Cones erect, the scales persistent or deciduous. 



a. Cone scales persistent; seeds about as long as the 

 scales; bracts shorter than the scales; leaves flattened, 

 keeled above, pale below Keteleeria. 



b. Cone scales deciduous; seeds shorter than the scales; 

 bracts shorter or longer than the scales; leaves flattened, 

 grooved above, usually pale below, 4 angled • . . .Abies. 



Taxodineae. Leaves spirally arranged, ovuliferous bracts and scales 

 almost completely coalescent; ovules 2-8, upright or finally reversed; 

 cone scales with 2-8 seeds; pollen grains wingless; leaves linear or 

 scale-like. 



I. Leaves persistent. 



A. Leaves lanceolate, flat, large, glaucous beneath; cone elongated, 

 scales serulate and reflexed at the apex Ounninghamia. 



B. Leaves awl-shaped, curved, small; cones globose with peltate 

 scales, 3-5 toothed at the apex; seeds angled Cryptomeria. 



II. Leaves and short branches deciduous; cone scales deciduous. 

 " Glyptoatrobus. 



