CYPRESS: ARBOR VIT.E 181 



(i) Scales of $ cone peltate and more or less 

 pentagonal ; ripe cone globoid, with several 

 seeds. 



Gupressus sempervirens, L. Roman Cypress (Fig. 48). 

 Tree, with dark foliage ; the scaly tetrastichous leaves 

 equally distributed and the shoots not flattened. 



The g cone oblong, about 4 5 mm. long, yellow, with 

 10 12 decussate stamens. $ cones usually in clusters 

 of two to five, sub-sessile, each of 8 12 woody scales of 

 about 20 30 mm. diameter ; scales more or less quadrate 

 or polygonal, smooth or slightly rugose, peltate, with a 

 slight blunt mucro in the centre, greenish-grey to grey- 

 brown and shining outside, dark brown within. 



(ii) Scales of $ cone not peltate, but oblong 

 and imbricated ; ripe cone ovoid elongated, 

 pendulous. 



Thuja gigantea, Nutt. Arbor Vitse. Tall tree with 

 flattened shoots. 



The </ flowers small ; stamens about six, in decussate 

 pairs. The $ cones numerous, clustered near the tips of 

 the shoots, ovoid-cylindric and about 12mm. long; each 

 of 8 12 scales, which are erect and imbricated, elliptic- 

 oblong, decussate, only about 4 of the larger median ones 

 bearing the erect ovules. Leaves small and scaly, crowded, 

 decussate, imbricate. Seeds small with faint notched 

 wing-like margins. 



(b) Scales of ? cone, and stamens of <? cone spirally 

 imbricated, the former closely; ovules in pairs, 

 inverted on an ovuliferous placental scale borne 

 on the inner face of the carpellary scale; seeds 

 winged; pollen with air-balloons; leaves long 

 and narrow, acicular or linear, &c. (AUetinea). 

 [A partial exception occurs in Pseudotsuga which has 

 no air-balloon to the pollen-grain.] 



