20 Leaves with a prominent mid-rib on upper surface, light bands 

 on under surface wider than green bands 



PLUM-YEW (CEPHALOTAXUS) 



20 Leaves without prominent mid-rib, light bands narrower than 



green bands (TORREYA) 



21 Leaf-scars oval, raised at lower end; leaf sometimes with an 

 indistinct petiole; buds never resinous 



DOUGLAS FIR (PSEUSOTSUGA) 



21 Leaf-scars round, not raised; leaf with a narrow or twisted 



base but no petiole ; buds sometimes resinous FIR (ABIES) 



22 Leaves spirally arranged 23 



22 Leaves in 3 or 4 ranks — • 24 



23 Leaves spike-like, flaring out, but also curved in at tip towards 



twig JAPANESE CEDAR (CRYPTOMERIA) - 



23 Leaves scale-like, flaring only slightly if at all 



CALIFORNIA BIG-TREE (SEQUOIA) 



24 Leaves in 3 or 4 ranks ; twigs roundish or squarish 25 



24 Leaves in 4 ranks ; twigs almost flat 27 



25 Leaves without whitish bands on either surface, leaf-margin 



usually delicately fringed CYPRESS (CUPRESSUS) 



25 Leaves usually with white bands on one surface, entire 26 



26 Leaves 3- or 4-ranked, scale-like or spike-like or both, often 

 with one or more white bands on upper surface 



JUNIPER, RED CEDAR (JUNIPERUS) \/ 



26 Leaves 4-ranked, always scale-like in mature trees, without 

 white bands on upper surface, sometimes with white marks 

 on under surface 

 WHITE CEDAR. FALSE CYPRESS (CHAMAECYPARIS) ^ 



27 Leaves scale-like, decurrent ; internodes longer than wide, twigs 



green on both surfaces....INCENSE CEDAR (LIBOCEDRUS) 



27 Leaves not very decurrent ; length and width of internodes 



about equal, twigs often with white marks on under surface 28 



9 



