46 PIN ACE AE. 



PICEA. Spruce. 



Conical evergreen trees with rather soft yellowish-white 

 ductless wood with scattered resin-passages (exceptionally 

 brown and with transversely clustered passages) ; moderate 

 fluted often hairy twigs ; small homogeneous pith ; 5-ranked 

 usually 4-sided needle-like leaves on raised bases bearing the 

 angled leaf-scars with a single bundle-trace ; no stipule-scars ; 

 ovoid scaly more or less resinous buds ; monoecious catkin-like 

 or cone-like naked flowers ; and pendent cones with persistent 

 thin scales each covering 2 winged seeds. 



1. Leaves small (scarcely 15 mm.), green, blunt. P. orientalis. 

 Leaves mostly longer (20-25 mm.), acute. 2. 



2. Leaves green. 3. 



Leaves pale or whitened. 4. 



3. Not weeping. P. excelsa. 

 Weeping. P. excelsa pendula. 



4. Leaves merely pale. 5. 



Leaves very glaucous. P. pungens. 



5. Odor balsamic: cones large (10-18 cm.). P. excelsa. 

 Odor fetid: cones small (scarcely 5 cm.). P. canadensis. 



TSUGA. Hemlock Spruce. 



Evergreen percurrent trees with ductless brownish wood 

 without resin-passages ; slender fluted twigs ; small continuous 

 pith; alternate somewhat raised minute half-round leaf-scars 

 with a single bundle-trace; no stipule-scars; sessile ovoid buds" 

 with several exposed scales ; very small oblong or lanceolate 

 sometimes serrulate short-petioled flat leaves whitened beneath ; 

 monoecious catkin- or cone-like naked flowers ; and small ovoid 

 cones, each thin scale covering 2 winged seeds. 



1. Trees. 2. 



Prostrate shrub. T. canadensis nana. 



2. Not weeping. 3. 



Weeping. T. canadensis pendula. 



.3. Conical or oblong. 4. 



Round-topped. T. canadensis globosa. 



