ANALYTICAL KEY. 



One - two-celled ovary : styles or stigmas 2-cleft. 394 (76) URTICACEJB. 

 One-celled ovary : style and stigma single and entire. 



Anthers opening longitudinally. . 380 (75) THYMELEACEJB. 



Anthers opening by uplifted valves like trap-doors. 373 LAURAOE.IS. 



IS . Flowers (monoecious or dioecious] one or both sorts in catkins. 

 * Only one sort of flowers in catkins or catkin-like heads. 



Fertile flowers in a short catkin, head, or strobile. . 394 (76) URTICACE^E. 

 fertile flowers single or clustered : sterile ones in slender catkins. 



Leaves pinnate : fertile flowers and fruit naked. 401 (77) JUGLANDACE^E. 



Leaves simple : fertile flowers 1-3 in an involucre or 



cupule. 403 (77) CCTULIFER.S. 



fc * Both sterile and fertile flowers in catkins or heads, 



(Wary and pod 1 -celled, many-seeded : seeds furnished 



with a downy tuft at one end. . . . 413 (78) SALICACEJK. 



Ovary and* woody pod 2-cellcd, many-seeded. Liquidambar, 148 HAMAMELACE^. 

 Ovary 1 -2-celled, only one ovule in each cell : fruit 1-seeded. 



Parasitic on trees : fruit a berry 382 LORANTHACE^:. 



Trees or shrubs, not parasitic. 



Calyx regular, conspicuous, that of the fertile flowers 



succulent in fruit 394 (76) URTICACE^E. 



Calyx none, or rudimentary and scale-like. 



Style and stigma one, simple : flowers in heads. 400 PLATANACE^:. 



Styles or long stigmas 2. 

 Fertile flowers 2 or 3 under each scale of the 



catkin : nutlets naked, winged or woody. 410 BETULACE.E. 



Fertile flowers single under each scale : nutlets 

 naked, globose, mostly waxy-coated or 



drupe-like. 409 MYRICACE.E. 



Fertile flowers single in a membranous sac. Ostrya, > 

 Fe-tile flowers 2, subtended by a one-sided and M03 CUFULIFEIUB. 

 lobed leafy involucre. Carpinus, J 



: 



SUBCLASS IT. GYMNOSFEKM^E. Pistil an open scale or altered 

 af, bearing naked ovules on its margin or its upper surface, or in Taxus 

 ntirely wanting. Flowers monoecious or dioecious. 



Leaves simple : stems branched 420 (78) CONIFERJE. 



Leaves pinnate, rigid : stem or caudex simple : plants 



therefore resembling Palms in aspect. . . . (80) CYCADACE^J, 



