Xll GENERA. 



Gen. Abies, Don (the Spruces). Leaves solitary, four-sided, 

 aud scattered all round the shoots, or flat, and more or 

 less in two rows laterally. 



Flowers, male and female on the same plant, but 

 separate. 



Cones pendent, solitary, and terminal, with thin per- 

 sistent scales. 

 1st division, Vera, or the true Spruces, with four-sided 



leaves, scattered all round the shoots. 

 2nd division, Tsuga, or those kinds with fiat leaves, more 

 or less in two rows, like the Hemlock Spruce, and 

 glaucous below. 



Gen. Picea, Don (the Silver Firs). Leaves solitary, flat, silvery 

 beneath, and pectinated in two or more rows. 



Flowers, male and female on the same plant, but 

 separate. 



Cones erect, cylindrical or nearly so, axillary on the 

 upper side of the branches, and with thin, deciduous 

 scales when ripe. 

 1st division, Bracteata, or those kinds with the bracteas 



longer than the scales of the cone. 

 2nd division, Brevibracteata, or those kinds with the brac- 

 teas shorter than the scales of the cone, and hidden. 



Gen. Larix, Link (the Larches). Leaves deciduous, linear, 

 soft, and produced in bundles on the adult branches. 



Flowers, male and female on the same plant, but 

 separate. 



Cones erect, small, oval, or somewhat cylindrical, with 

 persistent thin scales of a leathery texture, with a dor- 

 sal bractea. 



Seeds small, with a leathery covering and membra- 

 naceous wings. 

 Gen. Pseudo-larix, Gordon (the False Larch). Leaves decidu- 

 ous, flat, linear, soft, and collected in bundles on the 

 adult branches. 



Flowers, male and female on the same plant, but 

 separate. 



