WINTER KEY TO THE SPECIES OF PICEA 



a. Leaves ^-i inch long, sharp-pointed; twigs glabrous. 



b. Cones 1-2 inches long, maturing in first season; leaves 



ill-scented when bruised P. canadensis, p .21. 



bb. Cones 3-6 inches long, maturing in second season; leaves 



not ill-scented when bruised P. abics, p. 25 



aa. Leaves l /&-ty% inch long, blunt-pointed ; twigs rusty-pubescent 

 P. mariana, p. 23. 



19- 



