SYNOPSIS OF THE ORDERS OF PLANTS CONTAINED IN VOLUME II. 
OF THE SILVA OF NORTH AMERICA. 
Crass 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. 
Sus-Ciass I. Angiosperme. Pistil, a closed ovary containing the ovules and developing into the fruit. 
Division I. Polypetalee. Flowers with calyx and corolla, the latter divided into separate petals. 
B. DISCIFLORA. Sepals generally distinct. Stamens as many as the petals, or twice as many, or fewer, usually 
inserted on a hypogynous or perigynous disk. Ovary superior, many-celled. 
* * QOvules pendulous, raphe dorsal. 
14. Cyrillaceze. Flowers regular, perfect, 5-parted. Disk annular, confluent with the base of the ovary. 
Ovules solitary in each cell. Embryo minute, in fleshy albumen. Leaves alternate, exstipulate. 
*** QOvules erect, or rarely pendulous, raphe ventral. 
15. Celastraceze. Flowers perfect. Sepals and petals imbricated in estivation. Stamens alternate with the 
petals. Seeds often ariled. Leaves simple; stipules minute, caducous. 
16. Rhamnacez. Sepals valvate in estivation. Petals small, concave, or 0. Stamens opposite the petals. 
Seed solitary, not ariled. Embryo large, in fleshy albumen. Leaves simple, stipulate. 
* * * * Qvules ascending, raphe ventral or dorsal. 
17. Sapindaceze. Flowers usually polygamo-diecious. Disk fleshy, entire or lobed. Sepals imbricated or 
rarely valvate in zxstivation. Petals imbricated in estivation or 0. Stamens usually hypogynous. Seed exalbu- 
minous or rarely albuminous. Embryo usually fleshy ; cotyledons most often plano-convex, conferruminate (foliaceous 
in Hypelate and Acer). Leaves alternate, compound or rarely simple, exstipulate or rarely stipulate. 
