ANALYTICAL KEY. 27 



Ovary 1-celled; juice not milky. 



Style, if any, and stigma only one ; leaves simple ; 



no scarious bracts around the flowers. . URTICACEJE, 461 

 Styles 3 ; embryo straight ; flowers involucrate. 



Eriogonurn, in POLYGONACE^;, 436 

 Style or stigmas 2 or 3 ; embryo coiled or curved. 

 Stipules not scarious, leaves palmately cleft or 



palmately compound. . . Cannabinese, in URTICACE^:, 461 

 Stipules scarious (or none) ; leaves opposite. ILLECEBRACE^E, 426 

 Stipules none; but flowers with scarious bracts. AMARANTACE/K,427 

 Stipules and scarious bracts none . . CHENOPODIACE^E, 430 

 Shrubs or trees. 

 Ovules a pair in each cell of the ovary. 



Fruit 2-celled, a double samara. Acerineae, in SAPINDACEJE, 115 

 Fruit a 1-celled and 1-seeded samara or a drupe. OLEACE^E, 335 



Ovules single in each cell of the 



Three - nine-celled ovary ; leaves heath-like. . EMPETRACE^E, 487 

 Three-celled ovary ; leaves broad. . . . RHAMNACE^E, 111 

 One - two-celled ovary ; styles or stigmas 2-cleft. URTICACE.E, 461 

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



Anthers opening longitudinally. . . THYMEL^EACE^E, 448 

 Anthers opening by uplifted valves. . . . LAURACE^E, 446 



B Flowers monoecious or dioecious, one or both sorts in catkins, 



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



Fertile flowers in a short catkin, head, or strobile. . . URTICACE.E, 461 



Fertile flowers single or clustered ; sterile in slender catkins (except in Fagus). 



Leaves pinnate ; fertile flowers and fruit naked. JUGLANDACE^E, 467 



Leaves simple ; fertile flowers 1-3 in an involucre or cup. CUPULLFER^E, 470 



2. Both sterile and fertile flowers in catkins or catkin-like heads. 

 Ovary and pod 2-celled, many-seeded. Liquidambar, in HAMAMELIDEJE, 180 

 Ovary and pod 1-celled, many-seeded ; seeds furnished with 



a downy tuft at one end. SALICACE^E, 480 



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



Parasitic on trees ; fruit a berry. . LORANTHACE^E, 449 



Trees or shrubs, not parasitic- 

 Calyx regular, in the fertile flower succulent in fruit. URTICACE^E, 461 

 Calyx none, or rudimentary and scale-like. 



Style and stigma one, simple ; the flowers in heads. PLATANACE^E, 466 

 Styles or long stigmas 2. 



Fertile flowers 2 or 3 at each scale of the catkin. CUPULIFER^E, 470 

 Fertile flowers single under each scale ; nutlets 



naked, waxy-coated or drupe like. . . . MYRICACE^, 469 



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

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

 entirely wanting. Flowers moncecious or dioecious. CONIFERS, 489 



