SYNOPSIS OF ORDERS AND FAMILIES 

 TREATED IN THIS WORK 



CLASS I GYMNOSPERMAE 



Ovules naked, borne on the face of a scale, not inclosed in an ovary. 



ORDER GINKGO ALES 



Stems with branches; secondary wood without vessels. Flowers 

 unisexual, dioecious, not borne in strobiles; the staminate flowers com- 

 posed of numerous stamens, each with 2 pollen sacs; pistillate flowers 

 naked, in pairs, borne on a long stalk enlarged at the apex to form 

 a cup-shaped disk. 



Family 1. Ginkgoaceae (Page 1) 



A family containing only 1 extant species confined to China. 



ORDER CONIFERALES 



Resinous trees, the stems increase in diameter by the addition of 

 annual layers of wood inside the bark; flowers unisexual; stamens 

 numerous; ovules and seeds 2 or more, borne on the face of a scale; 

 embryo with 2 or more cotyledons. 



Family 2. Pinaceae (Page 3) 



With dry seeds and ovules covered by a scale. 

 Family 3. Taxaceae (Page 41) 



With naked ovules and usually fleshy seeds. 



CLASS II ANGIOSPERMAE 



Carpels or pistils consisting of a closed cavity containing the ovules 

 and becoming the fruit. 



