BETULACEAE. — BETULA 471 



NORTHEASTERN ASIA. Korean Archipelago: Qiiclpaert: "in cratere 

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

 same locality, June 1907, U. Faurie (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. 1700 m., September 1909, U. Faurie (No. 3234; fruits); 

 "in summo montis Chananbon," alt. 1910 m., July 7, 1913, T. Nakai (No. 678, 

 ex Nakai). 



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

 parvifolia, ex Koidzvmii). 



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 tj'po recedit foliis satis parvis 3-5 cm. longis et 2-4 cm. latis late ovatis, basi 

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

 6-7 (-8). 



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

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



1 mention this aljnne fonn only on account of the serration of its leaves. The 

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

 tion resembles that of the t\T)ical 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 Bhojpallra, var. subcordata Regel in Bull. Soc. Nat. Mosc. XXXVIII. 



pt. 2, 416 (1865); in De Candolle, Prodr. XVI. 2, 177 (Bhojpattra) (1868).— 



Franchet & Savatier, Eman. PI. Jap. I. 406 (Bhojpattra) (1875). 

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



XXXn. 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 Tokyo Bot. Mag. VIII. 319, t. 6, fig. 30- 



32 (1894). 

 Betula Bhojpattra, vax.japonica Shirai in Tokyo Bot. Mag. XIX. (165) (1905). 

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



parte) (1904). 

 Betula Vukani L(^veille in BuU. Soc. Bot. France, LI. 423 (1904). 

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



XXVII. 119 (1913). 

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

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

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

 Betula nikocnsi.'i Koidzumi mss., ex Koidzumi, 1. c. (pro sjmon.) (1913); in 



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



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

 tinctius cordatis, serraturis angustioribus acutioribus inacqualibus, 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, 

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

 isl. Kaibato (tj'pe of var. incisa, ex Koidzumi). 



