The Trees of Vermont 37 



SUMMER AND WINTER KEY TO THE SPECIES OF PICEA 



a. Leaves y^-H "''di long; twigs conspicuously pubescent. 



b. Leaves usually /^-^s inch long, typically blunt-pointed, dark 

 blue-green ; cones about 1 inch long, persistent on the branches 

 for many years, their scales ragged-toothed; tree typical of 



swamps P. mariana, p. 43. 



bb. Leaves %-^ inch long, typically sharp-pointed, dark yellow- 

 green; cones 1/4-2 inches long, falling mostly during their first 

 winter, their scales not ragged-toothed ; tree typical of well- 

 drained uplands and rocky slopes P. rubra, p. 41. 



aa. Leaves ^-1 inch long; twigs not conspicuously pubescent, usually 

 glabrous. 

 b. Cones 1-2 inches long, maturing and falling in first season, their 

 scales not toothed ; leaves ill-scented when bruised, 



P. canadensis, p. 39. 

 bb. Cones 3-6 inches long, maturing and falling in second season, 

 their scales finely toothed ; leaves not ill-scented when bruised, 



P. abies, p. 45. 



