500 WILSON EXPEDITION TO CHINA 



some forms of both varieties which may possibly better be considered subspecies, 

 but it needs more material and more observations in the field in order to get a 

 good idea of the forms which are of taxonomic value. I may mention Wilson's No. 

 7613 (from near Lake Towada, alt. 600 m., October 6, 1914, slender tree 8-12 m. 

 tall, girth 0.3-0.6 m.), which looks like a distinct form of the typical variety. 



There is another specimen of Wilson's (No. 7261, from Hokkaido, prov. Oshima, 

 Onuma-koen, local by lake side, July 26, 1914, tree 10 m tall, girth 0.6 m., branches 

 horizontally spreading). In shape and serration the leaves are more like those of 

 A. incana Moench; the pubescence is more like that of the typical A. hirsuta than 

 that of var. sibirica, the cones are not yet ripe. This specimen may belong to 

 A. horealis Koidzumi (in Tokijo Bot. Mag. XXVIl. 145 [1913]), the types of 

 which were collected in Hokkaido, prov. Ishikari, near Sapporo, and in northern 

 Hondo, prov. Mutsu, Kawau-chimura. Koidzumi describes the leaves as more 

 orbicular than they are in Wilson's plant. Without having seen a specimen of 

 A. horealis it is impossible to say whether it is a distinct species or only a variety 

 of A. hirsuta and similar to Wilson's No. 7261. 



Komarov seems to believe that the true A. sibirica Fischer is the most western 

 form in Siberia of the group to which also belong A. hirsuta Turczaninow, A. tinc- 

 toria sensu Komarov and A. incana Moench. So far as I know these species 1 be- 

 lieve that A. hirsuta sensu meo represents A. incana Moench in eastern Asia. 

 The differences between these eastern Asiatic forms are not greater than they are 

 between the different forms of A. incana Moench described by Callier apud 

 Schneider, III. Handb. Laubholzk. 1. 135 (1904). 



Alnus hirsuta var. sibirica is a very common tree in moist woods and on the 

 margins of lakes and by the side of streams in Japan from central Hondo north- 

 ward, but rare in Hokkaido. It is usually a more slender tree than the typical 

 species. E. H. W. 



Pictures of this Alder will be found under Nos. xl91, x251, x252, x508, 

 x540 of the collection of my Japanese photographs. 



9. Alnus Matsumurae Callier in Fedde, Rep. Spec. Nov. X. 234 (1911); apud 

 Schneider, III. Handb. Laubholzk. II. 891, fig. 556 n-p, 557 k (1912). 



Alnus glutinosa Matsumura, List PI. Nikko, 29 (non Linnaeus) (1894). 

 Alnus incana, var. emarginata Matsumura in Jour. Coll. Sci. Tokyo, XVI. 



art. 5, 13, t. IV (1902); Ind. PI. Jap. II. pt. 2, 17 (1912). — Winkler in 



Engler, Pflanzenr. IV.-61, 120 (1904). 



JAPAN. Hondo: prov. Iwashiro, Ose, July 25, 1909 (ex Herb. Sakurai; 

 young fruits) ; prov. Shimotsuke, on the Konsei-toge, 1885, J. Matsumura (type; 

 fruits); on Nyoho-san, 1901, Yatabe & Matsumura (ex Matsumura); Yumoto to 

 Nikko, common in mountain forests, September 6, 1892, C. S. Sargent (tree 13- 

 17 m. tall, girth 3.6-5.4 m., pale bark; fruits); Yumoto, open country and woods, 

 abundant, June 22, 1914, E. H. Wilson (No. 6836; bush or tree, 3-15 m. tall, 

 girth 0.9 m.; young fruits); same place, August 30, 1904, A^. Mochizuki (fruits); 

 prov. Shinano, on Tsubakura-dake, side of streams, alt. 1200-1800 m., Sep- 

 tember 3, 1914, E. H. Wilson (No. 7501; tree 10-13 m. tall, girth 0.9-1.2 m., 

 branches horizontally wide-spreading; fertile); prov. Kai, Fuji-san, July 27, 1908 

 (ex Herb. Sakurai; young fruits); prov. Sliinano, Jizogatake, July 1903, U. Faurie 

 (No. 5362; young fruits). 



This is a well-marked species resembling in the shape of its obovate emarginate 

 leaves A. Faurici L6veill6, but in A. Fauriei the under surface of the leaves is 

 greenish and not grayish and papillose as in A. Matsumurae CalUer. 



