Cedrus PINACEAE-TAXODIACEAE Metasequoia 



duced from the Himalayas; locally in Ki., Ku. Planted, ornamental. 



4. Tsuga Carr. Hemlock Wtf&% (T'ieh Shan Shu) 



Lvs. linear, flattened, with two white stomatic bands beneath, flexible, blunt or 

 notched at the tip, spirally arranged but appearing in two ranks: cones small, ovoid, 

 pendulous on the ends of last year's brs.: cone scales subtended by small bracts, 

 bearing two small winged seeds. About 10 species, in north temperate regions; 3 in 

 China. (The Japanese name.) 



1. Tsuga chinensis (Franch.) Pritz. Chinese Hemlock %k& (T'ieh Shan; Iron Fir) 

 (R.M.20). Tree, to 50 m.; fr. X; lvs. notched at the apex. Western China; locally 

 in An., Che. Mountain ridges at 1,500 to 3,000 m. elevation. Fig. 37. 



5. Pseudotsuga Carr. Hf^M (Huang Shan Shu) 



Lvs. similar to Tsuga: cones larger, about 5 cm. long: bracts exserted, with long 

 sharp points. 5 species, in eastern Asia and western North America; 2 in China. 

 (Greek: pseudos, false; and Tsuga.) 



1. Pseudotsuga sinensis Dode Mfe (Huang Shan; Yellow Fir) (R.M.19). Tree, to 

 30 m.; fr. X. Western and central China; locally in An. Mountain slopes, over 

 1,000 m. Fig. 38. 



32. TAXODIACEAE Taxodium Family ^yfcft (Shan Mu K'o) 



Resinous monoecious trees with spirally arranged or opposite, mostly needle like, 

 occasionally acicular or scale-like deciduous or evergreen lvs. ivhich appear in two 

 ranks: stamens and ovules in cones; anthers several-celled; cone scales bearing 2-9 

 ovules: frtg. cones mostly woody; scales often peltate, without distinct bracts; seeds 

 ivith narrow iving-like borders. 8 genera with 15 species, widely distributed; 7 genera 

 and a dozen species native to or planted in China. 



Key to the Genera 



A. Frtg. cone-scales woody, peltate or wedge-shaped. 

 B. Deciduous. 



Lvs. decussate, flat and linear, becoming distichous and ap- 

 pearing 2-ranked: seeds 5-9 under each scale of the frtg. 

 cone: staminate cones borne singly in the If. axils on 



slender modified drooping brs 1. Metasequoia 



Lvs. spirally arranged, often appearing in 2 ranks. 



Staminate cones in drooping panicled leafless spikes 2. Taxodium 



Staminate cones solitary, on tips of lfy. brs 3. Glyptostrobus 



BB. Evergreen: seeds 2-5 under each scale of the frtg. cone: sta- 

 minate cones in clusters terminating lfy. brs.: lvs. subulate, 



stiff, spirally arranged 4. Cryptomeria 



AA. Frtg. cone scales chartaceous, imbricated, sharp-pointed; seeds 3 

 under each scale: staminate cones in a cluster at tip of lfy. 

 br. : lvs. flat, stiff and sharp-pointed, evergreen 5. Cunninghamia 



1. Metasequoia sensu Hu & Cheng 7K&M (Shui Shan Shu) 

 Excurrent trees, the deciduous decussate linear lvs. with blunt or obtuse tips: 

 lvs. quickly becoming distichous by the twisting of decurrent basal portion of the 

 leaves and the axis to which they are attached; staminate cones borne singly in the 



64 



