SYNOPSIS OF THE ORDERS OF PLANTS CONTAINED IN VOLUME III. 
OF THE SILVA OF NORTH AMERICA. 
Ciass 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-Cuass I. Angiosperme. Pistil, a closed ovary containing the ovules and developing into the fruit. 
Division I. Polypetale. Flowers with calyx and corolla, the latter divided into separate petals. 
B. DISCIFLORAL. 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. 
18. Anacardiaceze. Flowers usually polygamo-diccious. Disk coherent with the base of the calyx. Sepals 
and petals imbricated in estivation. Stamens usually as many as the petals and alternate with them, or twice as many, 
inserted above or around the disk. Ovary 1-celled, the style 2 or 3-lobed, or 2 to 5-celled. Ovule solitary, sus- 
pended from the base of the cell on a slender funicle, or attached to the apex or to a parietal placenta. Seed exalbu- 
minous or rarely albuminous. Leaves alternate or rarely opposite, stipular or exstipular. 
C. CALYCIFLORA&. Sepals rarely distinct. Disk adnate to the base of the calyx, rarely tumid or conspicuous 
or wanting (Mimose). Petals usually as many as the lobes of the calyx, or fewer by abortion, inserted on the margin 
of the calyx-tube or of the disk, occasionally wanting. Stamens definite or indefinitc, perigynous or hypogynous. Ovary 
superior. 
19. Leguminose. Flowers regular or irregular. Stamens definite, monadelphous or diadelphous, or indefinite. 
Ovary composed of a single carpel. Ovules indefinite or 1 to 2, inserted on the interior angle, amphitropous or 
anatropous. Style terminal. Albumen often wanting. Leaves usually compound, stipular or exstipular. 
