188 WILSON EXPEDITION TO CHINA 
tected; that is, when firewood is needed they are generally spared. Ina few places 
mountaineers have even made small plantations near their houses of the Hickory 
and of a red-fruited Cornus. The Hickory trees thrive best at the foot of the moun- 
tains and in narrow moist valleys where they grow in deep rich humus. They 
love shelter and when exposed to much wind they become crippled. Apparently 
they cannot stand much frost. They grow with Liquidambar formosana, Castanea 
mollissima, Diospyros kaki, Pistacia chinensis, Albizzia species, Aleurites Fordii 
and Pinus Massoniana. The colloquial name for this tree is Shan-gho-to.” 
In China there are many endemic trees, but in eastern North America, now that 
Carya has been found in China, Sabal, Platanus (found also in Europe and western 
Asia), Robinia, Oxydendrum, Arbutus (found also in Europe and western Asia), 
Kalmia, Pinckneya, Taxodium and Chamaecyparis are the only genera of eastern 
American extratropical trees which are not also represented in eastern continental 
Asia. In China, however, Tazodium appears in the closely related Glyptostrobus 
which some botanists consider a T'azodium, and Chamaecyparis, although it has 
not yet been found in China, occurs in Japan and Formosa. 
