The Trees of Vermont 97 



SUMM L':R key to Tlll<: SI'ECIES OE BETUEA 



a. Bark of trunk chalky-white ; twigs without wintergreen taste. 

 h. Twigs usually warty-glandular ; bark of trunk not separating 

 freely into thin, papery layers ; inner bark dingy yellow ; leaves 

 nearly triangular to rhombic-ovate, long-pointed ; small tree, 



with trunk 6-10 inches in diameter B. populifolia, p. 103. 



bb. Twigs not warty-glandular; bark of trunk separating freely into 

 thin, papery layers, exposing the bright cinnamon-yellow inner 

 bark; leaves ovate, not long-pointed; large tree, with trunk 1-3 



feet in diameter B. alba papyrifera, p. 105. 



aa. Bark of trunk not chalky-white, usually dark colored ; twigs with 

 more or less wintergreen taste. 



b. Bark dirty yellowy breaking into strips more or less curled at the 

 edges ; leaves solitary or in pairs, slightly aromatic ; twigs with 



slight wintergreen taste B. lutea, p. 101. 



bb. Bark dark red-brown, cleaving off in thick, irregular plates (re- 

 sembles bark of black cherry) ; leaves in pairs, strongly aromatic ; 

 twigs with strong wintergreen taste B. lenta, p. 99. 



WINTER KEY TO THE SPECIES OF BETULA 



a. Bark of trunk chalky- white ; twigs without wintergreen taste. 

 b. Twigs usually warty-glandular; bark of trunk not separating 

 freely into thin, papery layers ; inner bark dingy yellow ; small 

 tree, with trunk 6-10 inches in diameter. . . B. populifolia, p. 103. 

 bb. Twigs not warty-glandular ; bark of trunk separating into thin, 

 papery layers, exposing the bright cinnamon-yellow inner bark ; 

 large tree, with trunk 1-3 feet in diameter, 



B. alba papyrifera, p. 105. 

 aa. Bark of trunk not chalky-white, usually dark colored; twigs with 

 more or less wintergreen taste. 



b. Bark dirty yellow, breaking into strips more or less curled at the 

 edges; twigs with slight wintergreen taste. . .B. lutea, p. 101. 

 bb. Bark dark red-brown, cleaving off in thick, irregular plates (re- 

 sembles bark of black cherry) ; twigs with strong wintergreen 

 taste B. lenta, p. 99. 



