470 WILSON EXPEDITION TO CHINA 



This often misunderstood species shows a high degree of variability, and it 

 seems difficult to arrange the different forms in a satisfactory way. Not being 

 able to accept the arrangement of Koidzumi, I propose to keep distinct the follow- 

 ing varieties and subvarieties which are connected more or less closely by inter- 

 mediate forms: 



Belula Ermanii, var. genuina Regel in Nouv. M&m. Soc. Nat. Mosc. XIII. 

 pt. 2, 122 (Monog. Betulac. 64), t. 2, fig. 13-28 (1861). 



Betula Ermanif var. typica Regel in Bull. Soc. Nat. Mosc. XXXVIII. pt. 2, 

 415 (1865); in De Candolle, Prodr. XVI- pt. 2, 176 (1868). 



Betula jE^rjnani, var. acw^z/oZia Winkler in Engler, Pflanzenr. IV.-61, 66 (1904). 



Betula Ermani, var. communis Koidzumi in Tokyo Bot. Mag. XXVII. 149 (pro 

 parte) (1913). 



f Betula Ermanif var. sachalinensis Koidzumi, 1. c. 148 (1913). 



Gemmarum squamae basi strobilorum tantum margine ciliatae facie glabrae 

 v. sparse pilosae; bractearum lobi ciliati, ceterum glabri, laterales plus minusve 

 erecti; samararum alae interdum satis angustae, Ramuli plus minusve glandu- 

 losi, rarius fere eglandulosi, interdum initio sparse pilosi. Folia basi truncata, 

 sabrotunda, leviter cordata v. subacuta, margine satis aequaliter et grossc v. 

 inaequaliter dent ato-s errata (baud distincte lobulato-serrata serraturis longe 

 acuminatis), subtus (v. utrinque) ad nervos sericea, interdum barbulata v. plus 

 minusve glabra, glandulis subtus numerosis praedita v. fere eglandulosa, nervis 



utrinque (6-)7-ll). 



NORTHEASTERN ASIA. Kamtchatka: "inmontibus" A . Erman [iyv^, 

 ex Chamisso); Petropavlovski, C. Wright (distributed as B . fruticosa) . Korea: 

 "distr. Musang, vallis Segel-su, fluvium Tumingan," June 18, 1897, V. Komarov 

 (No. 487; fruits); MamiU Mt., August 13, 1906, F. N. Meyer (No. 156; resem- 

 bling var. suhcordata in the serration of the leaves; fruits); Quelpaert (ex Nakai). 

 Saghalien: without locality, Fr. Schmidt (? type of var. acuiifoUa); " in sylvis 

 Wladimirof," July 22, 1908, U. Faurie (No. 293); same place, June 1908, U. 

 Faurie (No. 291; young fruits); "in plateis Wladimirof," June 1908, U. Faune 

 (No. 289; flowers); "in silvis basi montium," October 18, 1907, U. Faune (No. 5; 

 the shape of the leaves agrees well with Erman's plate, the wings of the seeds are 

 verj' narrow); Soroviyofka (type of var. sachalinensis, ex Koidzumi). 



JAPAN. Hokkaido : prov. Shiribeshi, Shiribeshi-san, alt. 300-2200 m., abun- 

 dant, base to summit, July 27, 1914, E. H. Wilson (No. 7279; tree up to 23 m. 

 tall, girth 4 m., bark pale gray, smoothish; also reduced to shrub with long spread- 

 ing branches, commonly rising from thick very short base) ; prov. Ishikari, Teine- 

 san, abundant, July 31, 1914, E. H. Wilson (No. 7304; tree 13-20 m. tall, girth 

 0.6-2.4 m., bark grayish white; fruits); Sapporo, Mt. Moiwa, September 17, 1892, 

 C. S. Sargent (tree 10-13 m. tall, girth 0.5-0.6 m,, white bark; fruits); prov. 

 Oshima, Hakodate, 1861, C. Maximowicz (distributed as B. ulmifolia typica) ; prov. 

 Iburi, Mororan, August 24, 1905, J. G. Jack (fruits). Hondo : prov. Mutsu, near 

 Aomori, 1200-1500 m., October 3, 1892, C. S. Sargent, 



Betula Ermanii, var. genuina, subvar. Saitoana Schneider, n. subyar. 

 f Betula Ermanij var. parvijolia Koidzumi in Tokyo Bot. Mag. XXv II. 



(1913). ^ , 



Betula Saitdana Nakai in Fedde, Rep. Spec. Nov. XIII. 249 (1914); m Tokyo 



Bot. Mag. XXIX, 43 (1915). 



A typo recedit fohis minoribus, circiter 3.5-5 cm. longis et 2.5-3.5 cm. latiSj 

 nervis lateraUbus 6-8. 



