BETULACEAE. — ALNUS 493 



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

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

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

 a few species, I cannot pro])ose a proper arrangement of the whole group. There 

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

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

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

 (1S41), 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. Alnus japonica Siebold & Zuccarini in Abh. Akad. Miinch. IV. pt. 3, 230 

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

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

 Lugd.-Bat. II. 137 (18G5); Prol. Fl. Jap.m (1866). — K. Koch, De7idr. II. pt. 1, 

 632 (1872). — Dippel, Ha7idb. Laubholzk. II. 153, fig. 74 (1892). — Sargent in 

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

 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. Hajidh. Laubholzk. I. 126, fig. 67 h-h', 69, f-g (1904). — Winkler in 

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

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

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

 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 Bnt. Isl. 

 I. 182 (1914). 



Almis 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. PI. Jap. 1. 457 (1875). — Matsu- 



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

 Alnus japonica, var. genuina Callier in Fedde, Rep. Spec. Nov. X. 228 (1911); 



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



Bot. Mag. XXIX. 46 (1915). 

 Alnus japonica, var. latifolia Callier in Fedde, Rep. Spec. Nov. X. 228 (1911); 



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

 Alnus japonica, var. reginosa (an resinosa f) Nakai in Tokyo Bot. Mag. XXIX. 



46 (1915). 



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

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

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



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

 tember 18, 1892, C. S. Sargent (tree 17-20 m. tall, girth 0.6-0.9 m.; fruits); same 

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

 Tanouchi (flowers); same locality, April ISSO (ex Herb. Sa])poro; flowers); prov. 

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

 1861, M. Albrecht (young leaves). Hondo: prov. Musashi, near Tokyo, by rice 

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

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

 6155^; flowers); same locality, February 2, 1908, Se])tcmber 9, 1905 (ex Herb. 

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

 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. 5. 



