192 IP 8 t e I s i a 



or on leading shoots all four ranks similar, 

 slightly carinatc, with spreading tips. Flowers 

 monoecious, minute. Staminate flower consist- 

 ing of two or three pairs of decussate stamens 

 borne on a short axis; stamens peltate, anther 

 sacs two to four, longitudinally dehiscent. Pis- 

 tillate llower of four to six pairs of decussate, 

 erect, oblong scales, the central or lower ones 

 fertile, each bearing at its base two to four erect 

 •orthotropous ovules. Fruit ripening the first 

 season, woody or leathery; cone-scales oblong, 

 with a small boss on the l)ack near the tip, the 

 fertile scales largest, each bearing one to four 

 seeds. 



Four species, two of North America and two 

 of eastern Asia. Only the following occurs in 

 western Xorth America. 



Thuja plicata D. Don. ex Lambert, Pin. 

 1824. Cedar. 



A large tree with short horizontal branches 

 often pendulous at the extremities, distichous 

 branchlets and deciduous spray; leaves 2-6 milli- 

 meters long, scale-like, usually acute, eglandular 

 or conspicuously glandular, dimorphic on all 



