56 CHINESE EOONOMiO TEEES 



Populus silvestrii Pampanini. 



Allied to P. tremula of Europe with broadly ovate, acuminate, serrate, 

 long-petioled leaves, tomentose beneath on young trees; on mature 

 trees glabrous. 



Central China. 



Populus rotundifolia GriS. var. duclouxiana Gambocz 



Has nearly orbicular, somewhat cordate leaves and very long pistillate 

 catkins (15-25 cm. long). Capsule long pedicelled. 



Allied to P. sieboldii of Japan. 



S. W. China. 



Populus suaveolens Fischer 



Twigs cylindric, leaves stiff, very thick, finely crenate-serrate, ciliate, 

 ovate to ovate-lanceolate, whitish beneath. 



Suitable for hot, dry climate; also for ornamental planting. Rather 

 slow growing but reaches a large size. 



Mongolia, Siberia, N. China, 



MYRICACEAE 



Trees and shrubs. Leaves alternate, simple, serrate, incised or entire. 

 Flowers without perianth, monoecious or dioecious in unisexual or 

 androgynous axillary catkins. In the androgynous inflorescence, the 

 staminate flowers are borne'below the pistillate flowers. Staminate flowers 

 with 4 (2-16) stamens in the axil of a bract; ovary rudimentary or absent. 

 Pistillate single or in pairs; ovary 1 celled, 1 ovuled, sessile, in the axil of 

 a bract, with 2-4, rarely 8, bractlets at the base; stigma 2, filiform, sessile, 

 or on a short stalked style. Fruit a drupe, fleshy or succulent or dry or 

 more or less covered with a waxy exudation, or a nut in a scaly involucre. 

 Nutlets hard and bony. Seeds exalbuminous. 



Family consisting of 2 or 3 genera and about 50 species. 



The following is the only Chinese genus known. 



MYEICA 



Aromatic shrub or small tree. Leaves deciduous or evergreen, entire, 

 dentate or lobed, mostly resin-dotted, without stipules. Flowers usually 



