INTRODUCTORY SURVEY 



15 



Two major subdivisions of the Seed Plants are recognized: 

 The Gymnosperms (Fig. 8), which have primitive, often cone- 

 Hke flowers and bear their seeds openly exposed on scales as 



r tree (Abicf! >wbilis). 



HI our common coniferous trees; and the Angiospenns (Fig. 9), 

 in which there is usually a typical flower with its various floral 

 parts, including an ovary in which the seeds are enclosed during 

 their development. There are only about 450 species of Gymno- 

 sperms living today, but the Angiosperms are an enormous 



