KEY TO THE SPECIES OF LARCHES 



1. Cones with bracts shorter than scales and usually concealed; 

 twigs slender, yellowish, glabrous. 



2. Cones V2-/4 " long, composed of 12-15 glabrous scales; twigs 

 glabrous, covered at first with glaucous bloom; eastern and far 

 northern L. laricina, Tamarack, p. 45. 



2. Cones Y^-Wi" long, composed of 40-50 hairy scales; twigs 



without bloom; ornamental exotic 



L. decidua, European Larch, p. 42. 



1. Cones with bracts conspicuous and exserted beyond the 40 or 

 more scales; twigs stout, brownish, hairy; western. 



3. Twigs with pale hairs, brittle; bark thick, red-brown plated 

 and deeply furrowed; cones 1-12" long; needles flatly 3-angled; 

 western L. occidentalis, Western Larch, p. 47. 



3. Twigs densely woolly, tough; bark thin, gray, scaly; cones 



\y2-2" long; needles 4-angled; western alpine 



L. lyallii, Subalpine Larch, p. 47 



[43] 



