PINACEAE. PICEA 35 



This tree is abundant in swamps in Saghalien, where it grows with the typical 

 var. japonica and from which it does not differ except in the color of the cone, 

 which is pale yellowish green. This form is based on my No. 7331, collected on 

 August 4, 1914, at Konuma near Toyohara. It is possible that Messrs. Miyabe 

 and Miyake are correct in referring this form to Schroder's chlorocarpa, which is 

 founded on a tree cultivated at Moscow. Its origin is not stated, but it is much 

 more probable that it came from Dahuria than from Saghalien. To avoid any 

 possibility of confusion it appears best to keep the Saghalien tree separate under a 

 distinct name. 



PICEA A. Dietr. 1 



The genus Picea is widely distributed in the colder and temperate regions of 

 the Northern Hemisphere from the Arctic Circle southward, reaching the Tropic 

 of Cancer on the mountains of Formosa in the Old World. Thirty-eight species 

 are now recognized and of these no fewer than 18 are endemic in central and west- 

 ern China. One other species is recorded from Formosa, but this is probably iden- 

 tical with the Chinese P. Watsoniana Mast. The central Asian P. Schrenkiana 

 Fisch. & Mey. also grows in the province of Kansu, so that more than half the 

 known species are Chinese. It is of course probable that when better known the 

 Chinese species may be somewhat reduced in number. Nearly all of them are now 

 in cultivation and it must be admitted that even in a juvenile condition they are 

 mostly dissimilar. A majority of them promise to thrive in this Arboretum 

 and in a few years it will be possible to judge their value and distinctness. 



In North America seven species are found, ranging from the Arctic Circle to the 

 slopes of the southern Appalachian Mountains and to the mountains of northern 

 New Mexico and Arizona. In Europe three species are indigenous, one of which 

 (P. obovata Ledeb.) extends far into Siberia. In the Taurus and the Caucasus is found 

 P. orientalis Carr. and two species are indigenous on the Himalayas. The central 

 Asian and southern Siberian P. Schrenkiana Fisch. & Mey. has been mentioned 

 as growing in northwest China, but the eastern limit of the range of this species is 

 not properly known. Six species occur in Japan and of these four (possibly five) 

 are endemic; the other is widely spread in Korea, Mandshuria and the Amur 

 region of northeastern Asia. 



KEY TO THE JAPANESE SPECIES 



Leaves quadrangular in section. 

 Branchlets quite glabrous. 



Shoots shining yellow-brown; winter-buds ovoid, acute or obtuse, chestnut-brown, 

 very slightly or not at all resinous; cone ovoid-cylindrical, from 8 to 10 cm. 



long P. POLITA. 



Shoots rusty to yellowish brown; winter-buds conical, acute, reddish brown and 



resinous; cone cylindrical, from 2.5 to 6.5 cm. long .... P. MAXIMO wiczn. 



Branchlets glandular-pubescent; reddish brown, slightly pruinose; winter-buds conical, 



swollen at the base, shining brown and resinous; cone cylindrical, from 4 to 10 cm. 



long P. KOYAMAI. 



Leaves slightly compressed, rhombic in section. 



Branchlets with dense rust-red pubescence; winter-buds conical to ovoid, swollen at 

 the base, shining chestnut-brown and resinous; cone cylindrical, from 5 to 8 cm. 

 long P. GLEHNII. 



1 Link (in Abh. Akad. Berl. 1827, 179) is usually cited as the author of the genus Picea, but it was 

 founded by A. Dietrich (Fl. Berl., I. abh. 2, 794 [1824]). 



