230 CHINESE ECONOMIC TREES 



Acer oblonguzn Wallich. 



Tree 18 m. tall. Leaves oblong, entire, sometimes 3 lobed in young 

 plants, long acuminate at the apex, 3 nerved at the base, 4-18 cm. long, 

 glaucous below. Wings of samara at right angles or spreading. 



Western and Central China to the Himalayas. 



Acer palmatutn Thunberg. 



Shrub or small tree. ' Leaflets 5-7 lobed, fi-8 cm. long, oblong-ovate, 

 acuminate, doubly serrate. Wings and seeds about 2 cm. long. 

 Kiangsi. 



Acer davidii Franchet. 



Tree 15 m. tall. Branchlets glabrous. Leaves ovate, or oblong-ovate, 

 6-22 cm. long, acuminate, crenate-serrate, rounded or subcordate at the 

 base. Fruit in slender racemes, wings horizontal. 



Central China. 



Acer trifidum Hooker & Arnot. 



Small tree with leathery 3-lobed leaves. Commonly planted as 

 hedges. China and Japan. 



DIPTERONIA 



The genus differs from Acer by the wings of the fruit entirely 

 encircling the nutlet. It is represented by a single species, confined to 

 Hupeh and Szechuan. 



Dipteronia sinensis Oliver. 



Tree 6 m. high. Leaves odd pinnate, 22-45 cm. long; leaflets 9-15, 

 2.5-5 cm. long, acute, coarsely serrate. Flowers piofuse, ih terminal 

 panicles. Fruit ovate, compressed, oblique. 



H I PPOC AST AN ACEAE 



Trees or shrubs. Leaves palmately 3-9 foliate. Flowers perfect, or 

 unisexual, irregular. Sepals 5. Petals 4-6, unequal, guiculate. Stamens 

 free, 5-8, disk extra-staminal. Ovary 3 celled. 2 ovules in each cell. 

 Style ]. Stigma 1. Fruit usually a 3 valved capsule, 1 celled, 1 seeded. 

 Seeds very large, exalbuminous. 



A family containing 2 genera, 1 widely distributed in the temperate 

 regions of the world, the other {Billia) confined to Mexico and Central 



