KEY TO THE FAMILIES 283 



F. The periiinth with all parts similiarly colored. 

 G. Parts of perianth 6, similar, green or chaffy 

 (bract-like) or glume-like (glumaceous seg- 

 ments) Juncacem. 



GG. Parts of perianth 6, regular, colored 



Lillacece, p. 296 

 FF. The perianth with parts differently colored. 



G. Leaves verticillate : stigmas 3 



Trillium in Liliacece, p. 300 



GG Leaves alternate: stigma 1 Connnelinacea;, p. 302 



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

 flowers perfect. 



F. Anthers 3 Iridacece, p. 305 



FF. Anthers C Amaryliidacece, p. 303 



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



Orchiducece, p. 307 

 OC. 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. 287). 

 le. Flowers characteristically apetalous; mostly small 

 and often greenish, inconspicuous. 

 F. Plants woody. 



G. The flDwers monoecious or dioecious, one or 

 both sorts in catkins. 

 H. Fertile flowers in short catkins or heads; 

 calyx regular in the pistillate flower, be- 

 coming fleshy or juicy in the fruit (juice 



milky) Urticacew, p. 313 



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 



: l-seeded nut: sterile fls. in elongated 



catkins Cupulifeui', p. 310 



«a. The flowers not in catkins. 



H. Calyx-tube adherent to ovary: climbing 



Arisiolochiacea', p. 316 

 HH. Calyx-tube hypogynous. 

 I. Leaves opposite. 



J Fruit a double samara, 2-winged 



Sapindacete, p. 343 



