BETULACEAE. — ALNUS 493 



In this section I place all the species of eastern Asia the male catkins of which 

 are solitary, axillary and terminal, forming a racemose terminal main inflorescence. 

 The seeds have thick wings often reduced to a narrow margin. Dealing only with 

 a few species, I cannot propose a proper arrangement of the whole group. There 

 may be several groups of equal taxonomic rank as section Gymnothyrsus proper and 

 sect. Clethropsis, or the first may be divided into different subsections or series. 

 I do not know whether this section also includes section Phyllothyrsus Spach 

 (1841), which is the same as section Pseudalnus Regel (ISGl), because 1 have not 

 been able to study the species from Central and South America referred to these 

 sections. 



3. AInus japonica Siebold & Zuccarini in Abh. Akad. Munch. IV. pt. 3, 230 

 (Fl. Jap. Fam. Nat. II. 106) (1846). — Regel in Nouv. Mem. Soc. Nat. Mosc. 

 XIII. 143, t. 15, fig. 22-27 {Monog. Betulac. 85) (1861). — Miquel in Ann. Mus. 

 Lugd.-Bat. II. 137 (1865); Prol.FlJap.m (1866). — K. Koch, Dendr. II. pt. 1, 

 632 (1872). — Dippel, Handh. Laubholzk. II. 153, fig. 74 (1892). —Sargent in 

 Garden & Forest, II. 344, fig. 53 (1893); For. Fl. Jap. 63, t. 20 (1894), — Kochne, 

 Deutsche Dendr. 113 (1893). — Shirasawa, Icon. Ess. For. Jap. I. 47, t. 19, fig. 18- 

 34 (1900). — Komarov in Act. Hort. Petrop. XXII. 60 (Fl. Mansh. II.) (1903). — 

 Schneider, III. Handh. Laubholzk. I. 126, fig. 67 h-hS 69, f-g (1904). — Winkler in 

 Engler, Pjlanzenr. IV.~61, 114 (1904), exclud. synon. var. formosana. — Henry in 

 Henry & Elwes, Trees Gr. Brit. & Irel. IV. 953, t. 268, fig. 12 (1909). — Matsu- 

 mura, Ind. PL Jap. II. pt. 2, 18 (1912). — Ascherson & Graebner, Syn. Mittdcur. 

 Fl. IV. 428 (1911). — Nakai in Jour. Coll. Sci. Tokyo, XXXI. 204 (Fl. Kor. II.) 

 (1911); in Tokyo Bot. Mag. XXIX. 46 (1915). — Bean, Trees & Shrubs Brit. Isl. 

 I. 182 (1914). 



Alnus maritima, var. japonica Regel in Bull. Soc. Nat. Mosc. XXXVIII. pt. 2, 



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



Formosana. — Franchet &Savatier, Enum. PL Jap. I. 457 (1875). — Matsu- 



mura in Jour. ColL Sci. Tokyo, XVI. art. 5, 7 (Rev. Alni Spec. Jap.) (1902). 

 Alnus japonica, var. genuina CaUier in Fedde, Rep. Spec. Nov. X. 228 (1011); 



apud Schneider, lU. Handb. Laubholzk. II. 890 (1912). — Nakai in Tokyo 



BoL Mag. XXIX. 46 (1915). 

 Alnus japonica, var. latifolia CaUier in Fedde, Rep. Spec. Nov. X. 228 (1011); 



apud Schneider, IlL Handb. Laubholzk. II. 890, fig. 555 i (1912). 

 Alnus japonica, var. reginosa (an resinosa ?) Nakai in Tokyo BoL Mag. XXIX. 



4G (1915). 



NORTHEASTERN ASIA. Ussuri: Vladivostok, low grounds, rare, August 

 18, 1903, C. S. Sargent (fruits; may represent var. latifolia CaUier). Korea : along 

 traU to Pouck Han, Seoul, September 25, 1905, J. G. Jack (fruits). 



JAPAN. Hokkaido: prov. Ishikari, Sapporo, common in low grounds, Sep- 

 tem!)er 18, 1892, C. S. Sargent (tree 17-20 m. taU, girth 0.6-0.9 m.; fruits); same 

 locahty, August 23, 1905, J. G. Jack (fruits); same locality, March 28, 1877, S. 

 Tanouchi (flowers); same locality, April 1880 (ex Herb. Sapporo; flowers); prov. 

 Oshima: Hakodate, ad lacum Konuma, 1861, C. Maximawicz (fruits); Hakodate, 

 1881, M. Albrecht (young leaves). Hondo: prov. Musashi, near Tokyo, by rice 

 fields abundant, September 23, 1914, E. H. Wilson (No. 6155; smaU tree 5-10 m. 

 tall, girth 0.3-0.75 m.; fruits); same locality, February 12, 1914, E. H. Wilson (No. 

 oloo*; flowers); same locality, February' 2, 1908, September 9, 1905 (ex Herb. 

 Sakurai; flowers and sterile); prov. Shinano: on Tsubakura-dake, moist plains, 

 open country, alt. 600-1100 m., September 15, 1914, E. H. Wilson (No. 7468; 

 slender tree, 7-12 m. tall; fruits); Nagasendo, near Seba, October 28, 1892, C. S, 



