The Species of the Genus Larix. 39 
1923, p. 287. — A. OPPERMANN, in Det forstl. Forsogsy. i Danmark 
VII, 1923, p. 275. — 
L. dahurica var. kurilensis, SARGENT: Silv. N. Am. XII, 1898, 
p. 4, Note. — 
L. Cajanderi, Mayr: Fremdl. Wald- und Parkb. 1906, p. 297. — 
ELwes & Henry: Trees, Gr. Brit. and Irel. II, 1907, p. 346. — Datu. 
& Jackson: Handb. Conif. 1923, p. 279. — 
L. dahurica var. pubescens, PATSCHKE, in Engl. Bot. Jahrb. 
XLVIII, 1913, p. 651. — 
L. dahurica var. kamtschatica, MıyaBE & Kuno: Icon Ess. For. 
Hokkaido, 1920, p. 26. — Kuno, in Jap. Journ. Bot. II, 1925, p. 52 
et 217. — 
L. Gmelini (L. dahurica) is a very common tree through- 
out the entire forest-clad regions of Eastern Siberia, vast 
tracts being often entirely composed of it, especially in the 
north, where it alone forms the forest line (See Map V). 
Its most northerly point of occurrence is near the Cha- 
tanga and its tributary, the Novaja, at lat. 72°—721/:° N, 
(Middf. Reise IV, 1867, pp. 595 and 604), and further 
eastwards, at the mouth of the Lena, it reaches nearly as 
far north as lat. 72°N. (CAJANDER in Act. Soc. Sci. Fennicae, 
XXXII, No. 3, 1904, p. 32). From these outposts in the 
extreme north, it extends southwards through the whole 
of Eastern Siberia, and reaches its most southerly 
point of occurrence at about the same latitude as Vladi- 
vostok, where it goes over to var. olgensis, which car- 
ries the area of occurrence further southwards. In 
the southern parts of the area of distribution, it 
goes westwards to Lake Baikal, the northerly part 
reaching as far west as the district around the mouth 
of the Jenisej. Near Lake Baikal, and along the banks of 
the Lena from Kirensk to Oleminsk, forms are found 
intermediate between the typical L. Gmelini and L. sibirica; 
the same phenomenon might also conceivably be observed 
