SYNOPSIS OF THE ORDERS OF PLANTS CONTAINED IN VOLUME IX. 
OF THE SILVA OF NORTH AMERICA. 
Cuass I. DICOTYLEDONOUS or EXOGENOUS PLANTS. 
Stems increasing in diameter by the annual addition of a layer of wood inside the bark. Leaves netted-veined. Embryo 
with a pair of opposite cotyledons. 
Suz-Ciass I. Angiosperme. Pistil, a closed ovary containing the ovules and developing into the fruit. 
Division III. Apetale. Corolla 0. Stamens inserted on the petaloid calyx, or hypogynous. 
51. Cupuliferze. Flowers monecious or rarely perfect. Stamens 2 to 4 or indefinite. Ovary inferior, after anthesis 
imperfectly 2 to 3 or rarely 4 to 6-celled. Ovule solitary, or in pairs, ascending or descending, anatropous. Fruit 
a nut usually more or less inclosed in bracts free or united into a woody involucre. Leaves alternate, stipulate. 
52. Betulaceze. Flowers monecious. Stamens 2 to 4. Ovary inferior, 2-celled. Ovule solitary, suspended, 
anatropous. Fruit a nut covered by the deciduous or persistent scales of a strobile. Leaves alternate, stipulate. 
53. Myricacez. Flowers monecious or diecious. Stamens usually 4 to 6. Ovary inferior, 1-celled. Ovule soli- 
tary, erect, orthotropous. Fruit drupaceous, often covered with a waxy exudation. Leaves resinous-punctate, alternate, 
rarely stipulate. 
54. Salicaceza. Flowers monecious. Perianth 0. Stamens 2 or many. Ovary 1-celled. Ovules numerous, 
ascending, anatropous. Fruit a 2 to 4-valved capsule. Leaves alternate, stipulate. 
