SYNOPSIS OF THE ORDERS OF PLANTS CONTAINED IN VOLUME XI. 



OF THE SILYA OF NORTH AMERICA. 



Class III. GYMNOSPERM^J. Resinous trees or shrubs. 



Stems increasing in diameter by the annual addition of a layer of wood inside the bark. Flowers unisexual, naked. 

 Stamens numerous. Ovules 2 or many not inclosed in an ovary. Cotyledons 2 or more. Leaves usually straight-veined, 

 persistent, or deciduous. 



58. Coniferae. Flowers monoecious, usually solitary, terminal, or axillary. Ovules 2 or many. Fruit a woody 

 or rarely fleshy strobile. Cotyledons 2 or many. Leaves scale-like, linear or subulate, solitary or clustered. 



