494 WILSON EXPEDITION TO CHINA 



Sargent (tree 17-20 m. tall, girth 0.6 m.; fruits) ; prov. IT go, on Chokai-san, common, 

 October 14, 1914, E. H. Wilson (No. 7178; tree 5-8 m. tall, girth 0.3-0.9 m.; 

 fruits). 



The specimens enumerated above represent the var. genuina Callier, which has 

 the branchlets always glabrous. The following variety has the young branchleta 

 more or lass hairy, and even later in the season they are slightly hairy. 



Alnus japonica, var. arguta CaUier in Fedde, Rep. Spec. Nov. X. 229 (1911); 

 apud Schneider, III. Handb. Laubholzk. II. 890, fig. 555 1 (1912). 



Alnus maritima, var. arguta Regel in Bull. Soc. Nat. Mosc. XXXVllI. pt. 



2, 428 (1865); in De Candolle, Prodr. XVI. pt. 2, 186 (1868). — Franchet 



& Savatier, Enum. PI. Jap. 1. 458 (1875). — Herder in Act. Hort. Petrop. 



Xll. 73 {PI. Radd.) (1892). 

 Alnus maritima, var. japonica Burkill in Jour. Linn. Soc. XXVI. 500 (non 



Regel) (1899).— PaUbin in Act. Hort. Petrop. XVIII. 194 {Consp. Ft. 



Kor. II.) (1900). 



NORTHEASTERN ASIA. Ussuri: Port Bruce, 1860, C. Moxmomcs (? type 

 of var. arguta Regel; fruits). Korea: Port Chusan, 1859, C. Wilford (young 

 inflorescences); Ping-yang, September 18, 1905, J. G. Jack (fruits); Chinnampo, 

 eecus aquas, August 1906, U. Faurie (No. 206; fruits). 



JAPAN. Hokkaido : prov. Oshima, Onuma-koen, common in swampy places, 

 July 26, 1914, E. H. Wilson (No. 7254; tree 13-18 m. tall, girth 0.6-1.2 m.; bark 

 smooth, branches ascending, spreading, brittle; young fruits); same prov., Hak- 

 kodate, in marshes, June 13, 1855, C. Wright (a spreading bush, fruits); prov. 

 Kushiro, forming pure and extensive woods in swampy places, August 12, 1914, 

 E. H. Wilson (No. 7381; tree up to 33 m. tall, girth 3 m., bark gray, rough, 

 trunk straight, free of branches for more than half the height of the tree, spreading, 

 slender; unripe fruits); prov. Ishikari, Sapporo, August 19, 1905, /. G. Jack 

 (sterile) ; same locality, June 16, 1903, S. Arimoto (young inflorescences). Hondo : 

 prov. Musashi, Yokohama, 1863, R. Oldham (No. 721; sterile). 



According to the material before me this variety seems to be only a form of the 

 type with sparsely pubescent branchlets. Callier keeps distinct A. japonica, var. 

 minor Miquel (in Ann. Mus. Lugd.-Bat. II. 137 [1865]; Prol. Fl. Jap. 69 [1866]), 

 of which Miquel mentions no type specimen. To this form may belong Faurie's 

 No. 5786, Hondo, " in sylvis Ubayu," July 1, 1904, which shows no real difference 

 from var. arguta. 



There is another variety: 



Alnus japonica, var. koreana Callier in Fedde, Rep. Spec. Nov. X. 229 (1911); 

 apud Schneider, III. Handb. Laubholzk. II. 890, fig. 555 m (1912). — Nakai in 

 Tokyo Hot. Mag. XXIX. 46 (1915). 



In this variety the j'oung branchlets and petioles are said to be densely villose 

 and the margins of the leaves more coarsely toothed. Callier does not mention a 

 type specimen, and I have not seen anything which might truly represent this 

 variety which according to Nakai was found in middle and northern Korea. A. 

 japonica seems to be planted only in southern Japan, although Matsumura men- 

 tions a specimen collected by K. Nagano in the prov. Chikuzen, Kyushu. 



There is also A. Mayrii CaUier apud Schneider, III. Handb. Laubholzk. I. 126 

 (1904), the type of which was collected by //. Mayr in Hokkaido, prov. Kushiro. 

 It is doubtful whether this is a hybrid or only a form of A . japonica. 



Alnus japonica is distributed in Japan from the Shinano province in central 

 Hondo and northward in greater numbers; it is also often planted round fields 



