22 CHINESE ECONOMIC TREES 



Tsuga chinensis Pritzel. 

 (Tieh Sha. I Iron Fir. 



Small tree, rarely 40 in. tall, with yellow-gray, more or less pubescent 

 branch lets. Leaves from 10-28 mm. long, rounded and notched at the 

 apex, dark glossy green above, paler with 2 white bands beneath and with 

 minute teeth <>n the margin when young, becoming smooth and green on 

 both surfaces with age. Cones sessile, 15-30 mm. long, with shiny, 

 brownish scales. 



Hupeh. Szechuan, Shensi. 



This is the common Hemlock in Central and Western China. The 

 wood is soft but durable, and is made into shingles. Closely allied to 

 the Japanese T. diver&ifolia. 



Tsuga yunnanensis (Franchet) Masters. 



Tree to 30 m. tall, with grayish and hairy branchlets. Cones with 

 fewer scales. Leaves not notched at the apex, white on the under side. 



Known only from Yunnan and Szechuan. It occurs on Omei Shan. 



PSEUDOTSUGA 



Large, pyramidal evergreen tree with deeply furrowed bark and 

 whorled branches. Winter buds acute, elongated, not resinous. Leaves 

 more or less 2 ranked, linear, flat, grooved on the upper surface with 

 numerous rows of stomata on each side of the midrib beneath ; with only 



1 fibro-vascular bundle. Flowers solitary; the staminate oblong-cylin- 

 drical with numerous globose anthers having spur-like connectives; 

 pistillate with spirally arranged scales, shorter than the pointed bracts. 

 Cones pendent, ovate oblong, ripening in 1 season with woody persistent 

 rigid scales shorter than the awn-pointed bracts. Seeds nearly triangular, 

 winged. 



4 speeies 2 in N. America, 1 in Japan and 1 in China. Pseudotsuga 

 closely resembles Abies from which it may be distinguished by the 

 elongated, non-resinous winter buds, by the slender, more flexible leaves 

 and by the pendent cone which appears bristly on account of the exserted, 



2 lobed, long aI1 ,i awned bracts. From Tsvga it is distinguished by the 

 smooth twigs not roughened by persistent leaf bases. The common 



