48 CONIFERS AND TAXADS OF JAPAN 



1.25 m. in girth with the lower branches resting on the ground; probably this is 

 the finest specimen of this species in the United States. 



Mayr says that the young leaves of his P. hondoensis are tinged with red on 

 the upper side when they issue from the bud, and Henry transposing the statement 

 applies it to those of P. ajanensis. I did not notice this phenomenon, which 

 is indicated in Siebold & Zuccarini's plate. 



In this Arboretum there is growing a very poor tree of P. jezoensis, received 

 under this name from Veitch in 1889, and this differs from other plants of the 

 species growing here in starting into growth a week or ten days earlier. In all 

 probability the plant was raised from seeds collected in Hokkaido by Maries and 

 in beginning to grow early it behaves like many other northern trees. In 

 eastern North America the Yezo Spruce rarely thrives and it is seldom seen in 

 gardens. In Great Britain it is usually known as P. Alcockiana. In Hokkaido 

 this tree is known as the Yezo-matsu and in Hondo as the Tohi. 



Picea jezoensis was first recognized from a plant cultivated in Tokyo by von 

 Siebold and was discovered growing wild by Dr. A. Th. von Middendorff on the 

 Stanovoi Mountains during his journey in northern and eastern Siberia in 1843-44. 

 In 1860 John Gould Veitch discovered it on Fuji-san and sent seeds to England in 

 1861 mixed with those of P. bicolor Mayr. In 1860 Veitch visited Hakodate 

 and sent to England seeds of the Flat-leaved Spruce, and this Hokkaido plant re- 

 ceived the name of Abies microsperma from Lindley. In 1879 Charles Maries 

 sent to Messrs. Veitch seeds from Hokkaido of P. jezoensis. 



TSUGA Carr. 



This genus is confined to the temperate regions of North America, Japan, 

 Formosa, central and western China and the Himalayas as far west as northeast- 

 ern Kumaon. Nine species are now known. Of these two are indigenous in eastern 

 North America and two in western North America. One of the latter species 

 (T. Mertensiana Sarg.) differs markedly in its leaves and cones from other 

 species of Tsuga and by some is placed in another genus (Hesperopeuce) . Of the 

 Asiatic species T. chinensis Pritz. is common on the mountains from western 

 Hupeh to the Chino-Thibetan borderland and also grows on the mountains of 

 Formosa. The second Chinese species, T. yunnanensis Mast., is distributed on 

 the mountains of western Szech'uan and western Yunnan and is possibly not 

 specifically distinct from T. Brunoniana Eichl. which grows on the Himalayas. 

 Two species are found in Japan, one being endemic and the other reaching the 

 Korean island of Ooryong. 



KEY TO THE JAPANESE SPECIES 



Shoots glabrous; winter-buds ovoid, slightly acute at the apex; leaves not crowded, 

 lustrous; cone-scales glabrous and ciliate T. SIEBOLDII. 



Shoots pubescent; winter-buds pyriform to subglobose, obtuse at the apex; leaves 

 crowded, not lustrous; cone-scales puberulous T. DIVERSIFOLIA. 



TSUGA SIEBOLDII Carr. 

 PLATES XXIX AND XXX 



TSUGA SIEBOLDII Carriere, Traite Conif. 186 (1855). Masters in Jour. Linn. 

 Soc. XVIII. 512 (1881). Mayr, Monog. Abiet. Jap. 59, t. 4, fig. 12 (1890). 



