1040 JOURNAL OF FORESTRY 



BOTANY AND ZOOLOGY 



With a monograph on larch, including a dis- 

 Larches cussion of the identification and distribution of 



of the the different species of the world, their varieties, 



World silvicultural characteristics, susceptibility to in- 



sect and fungus diseases, volume production, 

 characteristics of the wood produced, its utilization, and the manage- 

 ment of the different larches in pure and mixed stands, Gunnar Schotte, 

 editor of Skogsvdrdsforeningens Tidskrift, has made a very important 

 contribution to forestry literature of recent years. Though the whole 

 article contains a mass of valuable data so comprehensive in scope that 

 it is only possible in this review to direct attention to the monograph, 

 the following keys to the identification of the larches may prove of 

 especial interest to professional foresters : 



Key to Larches, Based on Cones ^ 



I. Cones very large, more than 2 to 2.5 cm. long. 



A. Bracts longer than cone scales. 



a. Bracts straight, pointing forward. 



1. Edges of cone scales smooth L. occidentalis (i) 



2. Edges of cone scales fringed L.lyallii {2) 



b. Exposed portion of bracks bent back- 



ward. 

 I. Cones 7 to 10 cm. long L. griffithii (4) 



B. Bracts shorter than cone scales. 



a. Cone scales straight, pointing toward tip 



of cone. 



1. Bracts visible, ripe cones not 



downy or villose. 



(a) Young twigs glabrous. .L. europecB {7)" 



(b) Young twigs slightly pu- 



bescent L. potanini (5) 



(c) Young twigs hirsute. ...Z,. o/(7^M.yu (14) 



2. Bracts not usually visible, ripe 



cones downy or villose L. sibirica (10) 



b. Tips of cone scales bent backwards. .. .L. leptolepis (6) 

 II. Cones small, less than 2 to 2.5 cm. long. 



a. Cones very small, 1.5 cm., occasionally 



2 cm., long L. americana (18) 



b. Cones a trifle larger, up to 2.5 cm. long. 



1. Leaves approximately 3.5 cm. long.L. dahurica (12) 



2. Leaves approximately 2 cm. long. L. kurilensis (15) 



Key to Larches, Based on Leaves and T7uigs'' 



I. Young twigs not glabrous. 



A. Young twigs covered with brownish gray to- 



mentum L. lyallii (2) 



^ Larix chinensis is not included. From descriptions in available works, its 

 cones are closely similar to those of L. americana. 



^ Cones of L. enropece vary considerably in size and form. 



^ L. potanini, L. olgensis, and L. chinensis are not included in this key, as a 

 sufficient supply of material was not available to the writer. 



