320 PEACTICAL BOTANY 



292. Classification: 



Spermatophytes 

 Gymnosperms 



Class I. Coniferales. Leading genera used as illustrations, — Pinus 

 (pine), Picea (spruce), Pseudoisuga (Douglas fir), Tsuga (hem- 

 lock), Abies (fir), Taxodium (bald cypress), Thuja (cedar), 

 Juniperus (red cedar, juniper), Sequoia (redwoods and big trees), 

 Taxus (yew) 



Class II. Cycadales. Genera used as illustrations, — Cycas, Micro- 

 cycas and Zamia 



Class III. Gnetales. Not studied in any detail 



Class I V. Ginkgoales. Represented by Ginkgo as the only living 

 genus 



