KEY TO THE FAMILIES OF CLASS I. 



Ill 



POKEWEED F. 191 



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

 Styles 10. Fruit a 10-seeded berry, 

 Styles or stigmas 2 or 3. 



Herbs with sheaths for stipules, and entire leaves, 



Herbs with separate stipules, and compound or cleft leaves. 



Herbs without stipules, and 



Without scaly bracts. Flowers small and greenish, 

 With scaly bracts around and among the flowers. 

 Shrubs or tre^ with opposite leaves. Fruit a pair of keys. 

 Shrubs or trees, with alternate leaves and deciduous stipules. 

 Stamens 9n the throat of the calyx, alternate with its lobes, 

 Stamens on the bottom of the calyx, ■» 

 Style one: stigma 2-lobed. Fruit a key. Leaves pinnate, 

 Style or sessile stigma one and simple. 



Calyx tubular or cup-shaped, colored like a corolla. 

 Stamens 8, on the tube. Shrubs : leaves simple. 

 Stamens 4, on the throat. Herbs: leaves compound^. 

 Stamens 5 or less on the receptacle. Calyx imitatingiP^apnopetalous 

 funnel-shaped corolla: a cup outside imitatiug«a calyx. 

 Herbs with opposite leaves, \ Mieabilis 



Calyx of 6 petal-like sepals colored like petals: stamens 9 or 12: anthers opening 



by uplifted valvesl Aromatic trees and shrubs, Laukel 



_ Calyx in the sterile flowers of 3 tb 6 greenish sepals : stamens the same number. 



Flowers monoecious or d.ioecious, ' Nettle 



Buckwheat 

 Hemp 



goosefoot 



Amaranth 

 t Maple 



Buckthokn 



Elm 

 Ash in t Olive 



F. 192 

 F. 196 



F. 191 



F. 192 

 F. 140 



F. 138 

 F. 195 

 F. 189 



Mezereum 

 Burnet in tEosE 



F. 19S 

 F. 146 



F. 191 

 F. 194 

 F. 196 



B. Flowers one or both sorts in catkins or catkin-like heads.. 



Hop in the Hemp F. 198 



Twining herbs, dioecious : fertile flowers only in a short catkin, 

 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-cIeft, in the fertile flowers becoming berry-like. Mulberry, &c. in Nettle 



F. 197 

 F. 197 



F. 196 



PI.ANE-TREE F. 196 



Calyx none : flowers in round heads. 

 Leaves pinnately veined. 



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



Flowers moncficious, 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. — GYMNOSPEKMS. 



Proper pistil none ; thS 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 



