48 PIN ACE AE. 



LARIX. Larch. Tamarack. 



Percurrent deciduous trees with reddish or brown soft wood 

 with few resin passages ; slender deeply fluted twigs ; small pale 

 homogeneous pith ; small alternate raised crescent-shaped or 

 transverse leaf-scars with i bundle-trace; no stipule-scars; soli- 

 tary sessile round buds with a number of exposed scales ; flat 

 entire narrow green leaves clustered on short spurs ; monoecious 

 catkin- or cone-like naked flowers ; and round-ovoid drooping 

 cones with persistent thin scales each covering 2 winged seeds. 



1. Cones 15-40 mm. long: scales usually downy. 2. 



Cones 10-15 mm. long: scales glabrous. L. laricina. 



2. Branches rather spreading. L. decidua. 

 Branches distinctly drooping. L. decidua pendula. 



CEDRUS. Cedar. 



Evergreen openly branched trees with yellowish soft ductless 

 wood without resin-passages; fluted rather slender twigs; small 

 continuous pith ; alternate raised 4-sided small leaf-scars with a 

 single bundle-trace ; no stipule-scars ; round or ovoid scaly not 

 resinous buds ; 4-angled needle-like leaves often crowded on 

 short spurs ; monoecious catkin- or cone-like naked flowers ; and 

 cones with thin scales each covering 2 winged seeds. 



1. Branches not drooping: cones flat or hollowed at tip. 2. 

 Branches drooping : cones rounded at tip. 6. 



2. Broad and flat-topped. 3. 

 Conical or oblong. 5. 



3. Trees. 4. 



Shrubby. C. Libani nana. 



4. Leaves green. C. Libani. 

 Leaves glaucous. C. Libani glauca. 



5. Conical. C. atlantica. 

 Narrowly oblong. C. atlantica fastigiata. 



6. Of erect growth. 7. 



Very spreading or prostrate. C. Deodara pendula. 



7. Narrowly oblong. C. Deodara fastigiata. 

 Rather conical. 8. 



