414 THE STORY OF PLANT LIFE 



For ready reference, and convenient for the 

 pocket, are Druce's ' Botanist's Pocket-book ' and 

 the less comprehensive Watts' * School Flora.' 



SYNOPSIS OF ORDERS, GENERA, 



Etc. 



DIVISION. EMBRYOPHYTA SIPHONOGAMA 

 (= PHANEROGAMIA). 



(Introductory Vol., p. 32 ; Vol. II, p. 58.) 



Alternation of generations obscured by seed form- 

 ation : sporophyte cormophytic, heterosporous. 



Megaspore (embryo - sac) not discharged from 

 sporangium (ovule) ; the latter when fertilised forms 

 a seed. 



Microspore (pollen-grain) on germinating forms a 

 pollen-tube. Antheridium a single cell dividing to 

 form the two generative cells. 



SUB-DIVISION. ANGIOSPERM^. (Introductory 

 Vol., p. 32 ; Vol. II, p. 58.) 



Ovules produced in an ovary formed of coherent 

 carpels, or of one carpel with coherent margins ; 

 endosperm formed after fertilisation ; stigma formed. 



Class I. Monocotyledons. 

 (Introductory Vol., p. 197 ; Vol. Ill, p. 269.) 



Embryo with one cotyledon ; stem with closed 

 vascular bundles (scattered in cross-section) ; leaves 

 usually parallel-veined ; flowers usually trimerous. 



