BETULACEAE. — BETULA 471 



NORTHEASTERN ASIA, Korean Archipelago: Quelpaert: "in cratere 



Hallai-san," alt. 2000 m., August 13, 1908, Taquet (Nos. 1440, type, et 1439; fruits) ; 



same locality, June 1907, U. Faune (No. 1538; flowers); " in sylvis Hallai-san," 



alt. 1200 m., June 17, 1907, U. Faurie (No. 1539; fruits); ''in vertice Hallai-san," 



alt. 2000 m., June 17, 1907, U. Faurie (No. 1540; young fruits); " in sylvis secus 



torrentes," Hallai-san, alt. 1700m., September 1909, U. Faurie (No. 3234; fruits); 



"in summo montis Chananbon," alt. 1910 m., July 7, 1913, T. Nakai (No. 078, 

 ex Nakai) . 



JAPAN. Hokkaido: prov. Ishikari, Teine-san, (7. Koidzumi{ type of var. 

 parvifolia, ex Koidzumi). 



This subvariety represents the most southern form of the species and comes 

 from a locality where we find so many peculiar plants. Koidzumi's variety seems 

 to be only a form of the typical B. Ermanii which was collected by Wilson (No. 

 7304) on the same mountain. 



Betula Ermanii, var. genuina, subvar. brevidentata Schneider, n. subvar. 



A typo recedit foliis satis parvis 3-5 cm. longis et 2-A cm. latis late ovatis, basi 



cordatis margine satis breviter et regulariter dentatis v. serratis, nervis lateralibus 

 ^7 (-8). 



JAPAN. Hondo: prov. Rikuchu, Hayachine-san, abundant, alt. 2000 m., 

 September 28, 1914, E. H. Wilson (No. 7577, type; bush; fruits). 



I mention this alpine form only on account of the serration of its leaves. The 

 shape of the leaves is more like that of var. suhcordata Koidzumi, but their serra- 

 tion resembles that of the typical B. Ermanii. It may represent another oeco- 

 logical form like subvar. Saitoana Schneider. 



Betula Ermanii, var. subcordata Koidzumi in Tokyo Bot. Mag. XXVII. 148 



(1913). 

 Betula Bhojpaltra^ var. suhcordata Regel in Bull. Soc. Nat. Mosc. XXXVIII. 



pt. 2, 416 (18G5); in DeCandoUe, Prodr. XVI. 2, 177 {Bhojpaitra} (18G8).— 



Franchet & Savatier, Enum. PI Jap. I. 400 {Bhojpaitra) (1875). 

 Betula Ermani, var. nipponica Maximowicz in Bull. Acad. Sci. St. Petershourg, 



XXXII. 622 (1888); in Mel. Biol. XII. 923 (1888). — Shirasawa, Icon, 



Ess. For. Jap. II. t. 14, fig. 16-23 (1908). 

 Betula alba, var. communis Shirai in I'okyo Bot. Mag. VIII. 319, t. 6, fig. 30- 



32 (1894). 

 Beiida Bhojpaitra, \ax.japonica Shjrai in Tokyo Bot. Mag. XIX. (165) (1905). 

 Betula Ermani, var, genuina Winkler in Engler, Pflanzenr. IV.-61, 66 (pro 



parte) (1904), 

 Betula Vulcani UveiU in B^dl. Soc. Bot. France, LI. 423 (1904). 

 Betula Ermani, var. suhcordata, f. nipponica Koidzumi in Tokyo Bot. Mag, 



XXVII. 149 (1913). 

 Betula Ermani, var.japonica Koidzumi, 1. c. 149 (1913). 

 Betula Ermani, var. communis Koidzumi, 1. c. 149 (pro parte) (1913). 

 f Betula Ermani, var. incisa Koidzumi, 1. c. 148 (1913). 

 Betula nikoensis Koidzumi mss.y ex Koidzumi, 1. c. (pro synon.) (1913); in 



Matsumura, Icon. PL Koisikav. II. 17, t. 93 (1914). 



. Varietati genuinae valde similis ab ea praecipue recedit foliis saepius dis- 

 tmctius cordatis, serraturis angustioribus acutioribus inaequalibus, saepe lobulatis, 

 nervis lateralibus saepissime 10-14. 



NORTHEASTERN ASIA. Saghalien : Toyohara, common, August 3, 1914, 

 E' H. Wilson (No. 7338; tree 14-20 m. tall, girth 1.5-2.4 m., bark grayish white, 

 snaggy; fruit) ; in montibus Takinosawa, July 24, 1908, U. Faurie (No. 292; fruits) ; 

 isl. Kaibato (type of var. incisa, ex Koidzumi). 



