SYNOPSIS OF THE ORDERS OF PLANTS CONTAINED IN VOLUME VI. 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-Cuiass I. Angiosperme. Pistil, a closed ovary containing the ovules and developing into the fruit. 
Division II. Gamopetale. Petals usually united. Stamens inserted on the corolla alternate with or opposite its 
lobes, or free from the corolla. Ovary inferior or superior. 
36. Hbenacez. Flowers diccious or rarely perfect, regular. Stamens usually free from the corolla, as many 
as its lobes, or twice as many, or indefinite. Ovary superior, 2 to 8-celled. Ovule solitary, anatropous. Seeds 
albuminous. Leaves alternate or rarely opposite, exstipulate. 
37. Styraceze. Flowers perfect or rarely polygamo-diecious, regular. Stamens inserted on the corolla and 
twice as many as its lobes, or indefinite. Ovary usually inferior or partly inferior, 2 to 5-celled. Ovule usually 
solitary, anatropous. Seeds albuminous. Leaves alternate, exstipulate. 
38. Oleaceze. Flowers perfect or rarely dicecious, or polygamo-diecious, regular. Stamens usually 2, inserted 
on the corolla, or hypogynous. Ovary superior, 2-celled. Ovules usually in pairs, rarely solitary or 4 to 8, anatropous 
or amphitropous. Seeds albuminous or exalbuminous. Leaves opposite, rarely alternate or verticillate, exstipulate. 
39. Borraginaceze. Flowers perfect or rarely polygamous, regular. Stamens as many as the lobes of the 
corolla, inserted on it. Ovary superior, 2-celled or imperfectly 4-celled. Ovules in pairs or solitary in each cell. 
Seeds albuminous. Leaves alternate or rarely opposite or verticillate, exstipulate. 
40. Bignoniacez. Flowers perfect, bilabiate. Stamens 4, rarely 2. Ovary superior, 2 or rarely 1-celled. 
Ovules numerous, anatropous. Seeds exalbuminous. Leaves opposite, exstipulate. 
41. Verbenacess. Flowers perfect or rarely polygamous, irregular or regular. Stamens 4 or rarely 2, inserted 
on the corolla. Ovary superior, imperfectly 4-celled. Ovules solitary or in pairs, usually amphitropous. 
Division III. Apetalee. Corolla 0. Stamens inserted on the petaloid calyx, or hypogynous. 
42. Nyctaginacesze. Flowers perfect or rarely unisexual, regular. Stamens 1 or many, hypogynous. Ovary 
1-celled. Ovule basal, solitary, erect. Seeds albuminous. Leaves opposite or alternate, exstipulate. 
43. Polygonacez. Flowers perfect or rarely unisexual. Stamens 6 to 9, rarely fewer or many, inserted on 
the calyx. Ovary superior, 1-celled. Ovule erect, solitary, orthotropous. Leaves alternate or rarely opposite, 
stipulate, the stipules sheathing the stem. 
