Key to the families of class i. 
Pistil only one, either simple or formed of two or more with their ovaries united. 
Styles 10. Fruit a 10-seeded berry, Poke weed 
Styles or stigmas 2 or 3. 
Herbs with sheaths for stipules, and entire leaves, Buckwheat 
Herbs with separate stipules, and compound or cleft leaves, Hemp 
Herbs without stipules, and 
Without scaly bracts. Flowers small and greenish, Goosefoot 
With scaly bracts around and among the flowers, Amaranth 
Shrubs or trees, with opposite leaves. Fruit a pair of keys, f Maple 
Shrubs or trees, with alternate leaves and deciduous stipules. 
Stamens on the throat of the calyx, alternate with its lobes, Buckthorn 
Stamens on the bottom of the calyx, Elm 
Style one: stigma 2-lobed. Fruit a key. Leaves pinnate, AshinfOLiVE 
Style or sessile stigma one and simple. 
Calyx tubular or cup-shaped, colored like a corolla. 
Stamens 8, on the tube. Shrubs : leaves simple, Mezereum 
Stamens 4, on the throat. Herbs: leaves compound. Burnet in IRose 
Stamens 5 or less on the receptacle. Calyx imitating a monopetalous 
funnel-shaped corolla: a cup outside imitating a calyx 
Herbs with opposite leaves, Mirabilis 
Calyx of 6 petal-like sepals colored like petals: stamens 9 or 12: anthers opening 
by uplifted valves. Aromatic trees and shrubs, Laurel 
Calyx in the sterile flowers of 3 to 5 greenish sepals: stamens the same number. 
Flowers monoecious or dioecious, Nettle 
B. Flowers one or both sorts in catkins or catkin-like heads. 
Twining herbs, dioecious : fertile flowers only in a short catkin, Hop in the Hemp 
Trees or shrubs. 
Sterile flowers only in catkins. Flowers monoecious. 
Leaves pinnate. Ovary and fruit (a kind of stone-fruit, without an involucre), Walnut 
Leaves simple. Nuts one or more in a cup or involucre, Oak 
Both kinds of flowers in catkins or close heads. 
Leaves palmately veined or lobed. 
Calyx 4-cleft, in the fertile flowers becoming berry-like. Mulberry, &c. in Nettle 
Calyx none: flowers in round heads, Plane-tree 
Leaves pinnately veined. 
Flowers dioecious, one to each scale. Pod many-seeded, Willow 
Flowers monoecious, the fertile ones 2 or more under each scale, Birch 
Flowers only one under each fertile scale. Fruit one-seeded, Sweet-Gale 
Subclass II. — GYMNOSPERMS. 
Ill 
F. 191 
F. 192 
F. 19S 
F. 191 
F. 192 
F. 140 
F. 138 
F. 195 
F. 189 
F. 195 
F. 146 
F. 191 
F. 194 
F. 195 
F. 196 
F. 197 
F. 197 
F. 196 
F. 196 
F. 199 
F. 199 
F. 198 
Proper pistil none ; the ovules and seeds naked, on the bottom or inner face of an 
open scale, as in Pines, or without any scale at all, as in Yew, Pine Family, 201 
