SEEIES I. 



FLOWERING OR PILENOGAMOUS PLANTS. 



Plants bearing true flowers ; that is, having stamens and 

 pistils, and producing seeds containing an embryo. 



Class I. ANGIOSPERMS. 



Plants having a closed ovary which contains the ovules : 

 includes all but the Pine and Cycas families. 



Subclass I. DICOTYLEDONS (or Exogens). 



Distinguished by having the woody strands of the stem 

 in a circle around a pith ; the wood often increasing by 

 yearly layers when the stem is more than one year old ; 

 the embryo with a pair of cotyledons or seed leaves; 

 leaves generally net-veined ; parts of the flower seldom 

 in threes, most commonly in fives or fours. See Lessons, 

 pp. 23, 139. This class includes all our ordinary trees and 

 shrubs, and the greater part of our herbs. 



I. POLYPETALOUS DIVISION. 



Includes the families which have, at least in some 

 species, both calyx and corolla, the latter with the petals 

 not united with each other. Yet some plants of almost all 

 these families have apetalous flowers, and in some species 

 the petals are more or less united. 



gbay's p. F. & G. BOT. — 3 33 



