Class I. DICOTYLEDONOUS or EXOGENOUS PLANTS.
Stems increasing in diameter by the annual addition of a layer of wood inside the bark. Leaves netted-veined. Embryowith a pair of opposite cotyledons.
Sub-Class I. Angiospermee. Pistil, a closed ovary containing the ovules and developing into the fruit.
Division III. ApetalSB. Corolla 0. Stamens inserted on the petaloid calyx, or hypogynous.
44. Lauracese. Flowers perfect or dioecious. Stamens 9 to 12, hypogynous. Ovary superior, 1-celled.Ovule solitary, suspended, anatropous. Seed exalbuminous. Leaves alternate or opposite, exstipulate.
45. Euphorbiacese. Flowers unisexual. Stamens 1, few or many. Ovary superior, usually 1-celled. Ovulesolitary, or 2, collateral, descending, anatropous. Seed albuminous. Leaves usually alternate or opposite, stipulate.
46. Ulmacese. Flowers perfect or polygamo-moncecious. Stamens as many as the lobes of the calyx,hypogynous. Ovary superior, 1-celled. Ovule solitary, suspended, anatropous. Fruit a compressed wingedsamara, or drupaceous. Seed albuminous. Leaves alternate, stipulate.
47. Moracese. Flowers unisexual. Stamens as many as the lobes of the calyx. Ovary superior, 1-celled.Ovule solitary, suspended, anatropous. Seed albuminous. Leaves alternate or opposite, stipulate.
48. Platanaceae. Flowers monoecious in dense unisexual capitate heads. Stamens as many as the lobes ofthe calyx. Ovary superior, 1-celled. Ovule usually solitary, suspended, orthotropous. Seed albuminous. Leavesalternate, stipulate.
49. Leitneriacese. Flowers amentaceous, dioecious. Stamens 3 to 12. Ovary superior, 1-celled. Ovulesolitary, ascending, semianatropous. Fruit drupaceous. Seed albuminous. Leaves alternate, exstipulate.
50. Juglandacese. Flowers monoecious. Stamens indefinite. Ovary inferior, 1-celled. Ovule erect, ortho-tropous. Fruit a nut inclosed in an indehiscent or 4-valved woody or fleshy involucre. Leaves alternate, exstipulate .