KEY TO THE FAMILIES OP CLASS 1. 



Ill 



Pistil only one, either simple or formed of two or more with their ovaries united. 



Styles 10. PVuit a 10-seeded berry, Pokeweed F. 191 



Styles or stigmas 2 or 3. 



Herbs wiCh sheaths for stipules, and entire leaves, Buckvv'heat 



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, fMAPLE 



Shrubs or trees, with alternate leaves and deciduous stipules. 



Stamens on the throat of the calyx, alternate with its lobes, Bucktiioen 



Stamens on the bottom of the calyx, Elm 



Style one: stigma 2-Iobed. 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, Mezekeum 



Stamens 4, on the throat. Herbs: leaves compound. Burnet in tRosE 



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 6 greenish sepals: stamens the same number. 



Flowers monoecious or dioecious, ' Nettle 



F. 192 

 F. 196 



F. 191 

 F. 192 

 F. 140 



F. 138 

 F. 196 

 F. 189 



F. 196 

 F. 146 



F. 191 

 F. 194 

 F. 196 



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 F. 196 



Trees or shrubs. 



Sterile flowers only in catkins. Flowers monoecious. 



Leaves pinnate. Ovary and fruit (a kind of stone-fruit, without an involucre). Walnut F. 197 

 Leaves simple. Nuts one or more in a cup or involucre. Oak F. 197 



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 F. 196 

 Calyx none: flowers in round heads, Plane-tree F. 196 



Leaves pinnately veined. 



Flowers dioecious, one to each scale. Pod many-seeded, Willow F. 199 



Flowers moncecious, the fertile ones 2 or more under each scale. Birch F. 199 



Flowers only one under each fertile scale. Fruit one-seeded, Sweet-Gale F. 198 



Subclass H. — GYMNOSPKRMS. 

 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 Famhy, 201 



