CHOSENIA, 



A New Genus of Salicaceae, 



By 

 Takenoshin Nakai, Rigakuhakushi. 



Since Linnsean period up to this date we have known no other 

 genera than Salix and Populus in the family Salicacese. The present 

 genus which I am introducing is a new addition to the family. It 

 is a big magnificent tree growing along the river-sides in North- 

 Korea. The trunks become one or one and half meter in diameter 

 and the height of tree becomes more than thirty meters. Its ap- 

 pearance is in every respect a Salix. Its bud has two or three im- 

 bricated scales like S. glandulosa and some others. The outermost 

 one of the scales wholly envelopes the inner ones, though it is im- 

 bricated at its margin. The tree is dioecious like a Salix. The male 

 catkins are drooping like Populus, but have neither gland nor 

 cup-like disk. The female catkins, too, have neither gland nor cup- 

 like disk, but have very fugaceous membranaceous five-nerved bracts. 

 The ovaries are blunt at their apices and have two distinct forked 

 styles. The styles are articulated and deciduous. 



In May of 1917, a staff of the Bureau of Forestry in North- 

 Korea collected the specimens bearing the male catkins near Nansha- 

 doko along the Jalu, and in the next year Mr.' Tsutomu Ishidoya 

 found the male tree near Taichuri of South-Hamgyoeng. Those 

 specimens were delivered me by Messrs. Masatomi Furumi and T. 

 Ishidoya, from which I made the descriptions of Salix splendida (see 

 the Tokyo Botanical Magazine Vol. XXXII. p. 215. Oct. 3918). 

 There I pointed that the plant may represent a distinct section by 

 the lack of the gland. We have had many fruit-bearing specimens, 

 but no female flowers reached us until Mr. Kiichi Iwata has collected 

 them in May of this year. Examining his specimens I found that 

 this plant represents a distinct genus. The name Chosenia is derived 

 from Chosen or Korea. It distributes all over those districts where 



