316 THE KINDS OF PLANTS 



ee. Perianth-tube adherent to ovary wholly or partly: 

 flowers perfect. 



f. Anthers 3 Iridaceae, p. 337 



ff. Anthers 6 Amaryllidaceae, p. 335 



fff. Anthers 1 or 2, united with pistil, gynandrous 



Orchidaceae, p. 339 

 cc. Dicotyledons: cotyledons 2 or more: leaves mostly netted- 

 veined, usually falling with a distinct joint or articula- 

 tion: stem with concentric layers of wood when more 

 than one year old (exogenous), and a distinct separable 

 bark: flowers mostly 5-merous or 4-merous (comprising 

 the remainder of this key). 

 d. Choripetalse: petals distinct or wanting (i. e., flowers 

 polypetalous, apetalous or naked, in distinction from 

 gamopetalous, dd, p. 319). 

 e. Flowers characteristically apetalous; mostly small and 

 often greenish, inconspiciious. 

 f. Plants woody. 



g. The flowers monoecious or dioecious, one or both 

 sorts in catkins. 

 H. Fertile flowers in short catkins or heads: calyx 

 regular in the pistillate flower, becoming 



fleshy or juicy in the fruit (juice milky) 



Urticacese, p. 345 

 hh. Fertile flowers 1-3 in a cup-like involucre: 

 or 2 or 3 at each scale of the pistillate catkin: 

 fruit dry, often winged, or a 1-seeded nut: 



sterile fls. in elongated catkins Cupuliferae, p. 342 



gg. The flowers not in catkins. 



h. Calyx-tube adherent to ovary : climbing 



Aristolochiaceae, p. 348 

 hh. Calyx-tube hypogynous. 

 i. Leaves opposite. 



j. Fruit a double samara, 2-winged 



Sapindaceae, p. 343 

 jj. Fruit a single-winged samara or 1-seeded 



drupe: stamens 2 Oleaceae, p. 388 



jjj. Fruit not winged: 3-seeded: stamens 4 



Euphorbiaceae, p. 351 

 ii. Leaves alternate. 



j. Styles or stigmas 2 or 2-cleft; stamens 

 equal the calyx-lobes and opposite to 



them Urticacese, p. 345 



jj. Styles or stigmas 3, each 2-cleft: pod 3- 

 ■ celled and 3-seeded: flowers 3-parted: 

 fruit a dry capsule : stamens 8 to many. . . 



Euphorbiaceae, p. 351 



