INTRODUCTION 17 



Leaves small, scale-like, closely pressed to the shoot (spreading 

 in Fitzroya and Athrotaxis selaginoides). 

 Foliage arranged in a flat spray. 



Cones oblong, woody, with the scales overlapping. 

 Foliage, aromatic when rubbed (usually). Cone scales 



8-12, the two upper fertile. — Thuya (Fig. 113). 

 Foliage not aromatic. Cone scales 6, the middle ones 

 only fertile. — Libocedrus (Fig. 66). 

 Cones sub-globose, woody, with scales valvate, peltate 

 or wedge-shaped. 

 Cones J— I in. in diameter with 2-5 seeds under each 



scale.— Cupressus (sect. Chamcecyparis (Fig. 44)). 

 Cones up to f in. diameter with numerous seeds under 

 each scale.— Cupressus (sect. Eu-Cupressus (Fig. 42)). 

 Foliage not arranged in a flattened spray. 

 Shrubs or small trees. 



Leaves spreading in whorls of 3, obtuse. Cones globose 



of 2-3 rows of scales. — Fitzroya (Fig. 49). 

 Leaves spirally arranged, spreading or appressed, acute 

 or obtuse. — Athrotaxis (Fig. 31). 

 Trees. 



Bark spongy, leaves spirally arranged, slightly spread- 

 ing, greyish green. — Sequoia gigantea (Fig. 107). 

 Bark not spongy, leaves not spreading, usually ap- 

 pressed. 

 Cones roundish, woody. Leaves all scale-like. — 



Cupressus (sect. Eu-Cupressus) (Fig. 42). 

 Cones roundish, fleshy, berry-like. Leaves some- 

 times scale- and needle-like on the same plant. 

 — Juniperus (Fig. 51). 



VI 



Leaves awl-shaped, spirally arranged, irregularly 4-sided, keeled, 

 pointing upwards.— Cr?//j^omena (Fig. 35). 



Leaves awl-shaped, spirally arranged, flattened. Spreading hori- 

 zontally. — Araucaria excelsa (Fig. 30). 



VII 



Leaves broad, flat, ovate, spirally arranged, densely crowded, 

 1-2 in. long, |-1 in. wide. — Araucaria imhricata. 



