SYNOPSIS OF THE ORDERS OF PLANTS CONTAINED IN VOLUME IV. 
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-Crass I. Angiosperme. Pistil, a closed ovary containing the ovules and developing into the fruit. 
Diviston I. Polypetales, Flowers with calyx and corolla, the latter divided into separate petals. 
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 indefinite, perigynous or hypogynous. Ovary 
superior. 
20. Rosaceze. Flowers usually regular. Stamens distinct, usually indefinite. Carpels 1-many, distinct or (in 
Pomez) united and combined with the calyx-tube. Style often lateral or basal. Ovules usually 2, anatropous. Seeds 
generally exalbuminous. Leaves usually alternate, dentate, lobed or divided, usually stipular. 
21. Saxifragacece. Flowers usually regular. Stamens mostly 5 to 10. Carpels usually 2, united or rarely 
free. Ovules numerous, anatropous. Styles free or united at the base. Seeds albuminous. 
Leaves opposite or alter- 
nate, stipular or exstipular. 
