ANALYTICAL KEY. 



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

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



Anthers opening longitudinally. . 380 (75) THYMELEACE^:. 



Anthers opening by uplifted valves like trap-doors. 378 LAURACE^:. 



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) URTICACEJB. 

 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) CUPULIFER^. 



* # Both sterile and fertile flowers in catkins or heads. 



Ovary and pod 1 -celled, many-seeded : seeds furnished 



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



Ovary and woody pod 2-celled, many-seeded. Liquidambar, 148 HAMAMELACEJB. 

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



Parasitic on trees : fruit a berry 382 LORAXTHACE js. 



Trees or shrubs, not parasitic. 

 Calyx regular, conspicuous, that of the fertile flowers 



succulent in fruit 394 (76) URTICACE^. 



Calyx none, or rudimentary and scale-like. 



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



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 MYRICACEJE. 



Fertile flowers single in a membranous sac. Ostrya, ^ 

 Fertile flowers 2, subtended by a one-sided and j-403 CUPULIFERE. 

 lobed leafy involucre. Carpinns, J 



SUBCLASS II. GYMNOSPEK\L. Pistil an open scale or altered 

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

 entirely wanting. Flowers monrecious or dioscious. 



Leaves simple : stems branched. . . { , . , 420 (78) CONIFERS. 

 Leaves pinnate, rigid : stem or caudex simple : plants 



therefore resembling Palms in aspect . . . (80) CYCADACEJS. 



