KEY TO NATURAL ORDERS. Xlll. 



DIVISION V. APETAL^ AMENTIFER^. 



Flowers mostly apetalous and unisexual; the staminate usually in 

 aments or catkins, as are also sometimes the pistillate. 



* Herbaceous plants; small green flowers in ament-like racemes, 



Stems square; herbage stinging-bristly URTICACE^E 296 



* * Woody plants, mostly trees or large shrubs. 



Monoecious; flowers and fruits in globose heads. . PLATANACE.E 297 

 Monoecious; flowers of both sexes in aments. 

 Staminate aments long, pendulous; pistil- 

 late ovoid, erect BETULACE^ 297 



Aments all short, erect; fruit a spheroidal 



nutlet MYRICACE^: 298 



Monoecious; pistillate flowers not in aments. 



Fruit drupaceous; nut rugose JUGLANDELE 301 



Fruit nut-like, inserted in, or enclosed 

 within an involucre. 



Involucre scaly or prickly CUPULIFER.E 301 



Involucre coriaceous-leafy CORYLACE.E 304 



Dioecious; flowers of both kinds in aments or 



catkins. 

 Flowers in a long pendulous opposite- bracted 



aments GARRYACEJE 160 



Ameuts alternate-bracted; fruit ca^psular; 



seeds comose SAMOACE^ 299 



SUBCLASS II. ENDOGENS. 

 Leaves parallel -veined; flowers 3-merous; cotyledon 1 only. 



Ovary inferior, twisted ORGHIDACE^: 305 



Ovary inferior, not twisted .... ... IRIDAOE^E 307 



Ovary superior; fruit a 3-celled capsule or a 



berry LILIACE^; 308 



