120 CHINESE ECONOMIC TREES 



Hemiptelea davidii (Hance) Planchon. 



(Zelkova davidii (Hance) Hemsley.) 

 (Planera davidii Hance.) 



Small tree. Branchlets reddish-brown. Leaves 2-6 cm. long, 

 elliptic-oblong to oval, acute, cuneate or subcordate at the base, coarsely 

 dentate-serrate; upper surface dark green, covered with scattered 

 deciduous hairs, each hair inserted in a dark, minute, circular depres- 

 sion ; lower surface generally smooth. Fruit about 6 cm. long. 



North and Central China and Korea. 



TREMA 



Evergreen shrubs or trees. Leaves alternate, 3-nerved, or pinnately 

 veined, serrate, short petioled. Flowers monoecious or dioecious, in 

 almost sessile clusters, small, apetalous, 5 (rarely 4) merous; stamens 

 4-5; ovary 1 celled; stigmas 2, united below into a single style. Fruit a 

 small drupe with a pitted stone. 



About 30 species in the tropical and subtropical regions. 



Trema virgata Blume. 



Tree to 10 m. tall with small, narrow, lanceolate leaves. 

 Hupeh, Szechuan, Yunnan, Hainan. 



MORACEAE 



Trees or shrubs mostly with milky juice. Leaves alternate, simple, 

 with petioles and stipules. Flowers monoecious or dioecious, in ament- 

 like clusters, or heads, apetalous; calyx 4-6 parted; stamens 1-4; ovary 

 1-2 celled, superior; style simple or 2 lobed. Fruit aggregated, inclosed 

 in the thickened calyx of the flower, forming a compound fruit. 



About 55 genera and 1,000 species widely distributed in the warmer 

 regions. This family includes many members of great economic im- 

 portance. Among the more important genera, Artocarpus integrefolia 

 (Jack Fruit) is cultivated in Kwangtung and is wild or naturalized in 

 the Island of Hainan. Fkus elastica (Rubber tree) is cultivated in China, 

 in Hainan. Canahis sativa (Hemp) and Brousounetia papyrifera yield 

 fibres suitable for making cloth and paper. Ficiis carica is the cultivated 



