64 CHINESE ECONOMIC TREES 



involucre, crowned with a short style divided into 2 papillose lobes at the 

 summit. ( >vary 1 celled, 1 ovule in the cell. Fruit, winged nuts attached 

 to a long pendulous axis. Nuts usually 2 winged with thin pericarp and 

 hard endocarp, imperfectly 4 celled at the base, 1 seeded. Cotyledons 4 

 lobed, carried above ground in germination. 



8 species all in Europe and Asia. 6 species occur in China. 



Pterocarya stenoptera De Candole. 



Trees 18 m. high, with long naked buds. Branchlets villose. Leaves 

 30 cm. long, rachis winged, or wings reduced or absent, pubescent 

 beneath or nearly glabrous; leaflets 9-25, sessile, coriaceous, oblong or 

 oblong lanceolate, acute, rounded and unequal at the base, serrate, 

 pubescent below on the midribs, 10-12 cm. long. Fruit on pendulous 

 axis sometimes 30 cm. long. Nut with beak-like apex, wings oblong to 

 oblong-lanceolate, usually upright and divergent. 



Common in C. and W. China. 



A rapid growing tree, planted in Shanghai and other cities as street 

 trees. Wood soft and light, of little known value. It would be advisable 

 to investigate this tree as to its value as matchwood. Its rapid growth 

 renders it capable of being managed on short rotations. It is occa- 

 sionally badly infested by aphis. 



Pterocarya hupehensis Skan. 



Tree S m. tall. Buds naked. Twigs glabrous. Rachis not winged. 

 Leaflets 5-9 (5 or 7-17 or 19), lanceolate, brown scurfy scaly beneath when 

 young, becoming glabrous excepting for persistent brown stellate hairs 

 along veins and axils of veins beneath. Fruit with suborbicular wing, 

 12 mm. in diameter. 



Hupeh. 



P. hupehensis does not appear to differ materially from P. fraxinifolia 

 Spach, and should probably be regarded as a synonym or mere form of 

 that species. 



Pterocarya paliurus Batalin. 



Tree 12 m. tall. Twigs glabrescent. Rachis not winged. Leaflets 7. 

 Fruit with the two wings connate, forming a large, orbicular membrane 

 around the nut. 



Central China. 



The fruit resembles somewhat that of Paliurus. 



