16 ANALYTICAL KEY 



Sepals 4; juice watery ; placentae parietal CAPPARIDACEAE, 438 

 Sepals 3 or 5, persistent; juice watery; placentae 



parietal CISTACEAE, 570 



Ovary several-celled. 



Calyx valvate in bud. ' 



Herbs or rarely shrubs; stamens united; anthers 



1-celled MALVACEAE, 566 



Trees; anthers 2-celled TILIACEAE, 565 



Calyx imbricate in bud. 

 Shrubs ; stamens on the base of the petals 



TEBNSTROBMIACEAE, 570 

 Aquatic or marsh-dwelling herbs. 

 Leaves tubular or trumpet-shaped; placentae in 



the axis SABRACENIACEAE, 439 



Leaves (when mature) flattish, never tubular or 

 trumpet-shaped; ovules on the partitions of 

 the ovary NYMPHAEACEAE, 389 



p. Calyx more or less adherent to a compound ovary. 

 Ovary 7-30-celled. 



Cells many-ovuled ; aquatic herbs NYMPHAEACEAE, 389 



Cells 10, each 1-ovuled ; trees or shrubs Amelanchier, 459 



Ovary 6-celled Asarum, 352 



Ovary 1-^5-celled. 



Fleshy-stemmed, without true foliage ; petals many CACTACEAE, 588 



Leaves present. 

 Sepals or calyx-lobes 2 ; ovules arising from the base of a 



1-celled ovary PORTULACACEAE, 387 



Sepals or calyx-lobes more than 2. 



Leaves opposite ; stipules none SAXIFRAGACEAE, 444 



Leaves alternate. 



Stipules present ROSACEAE, 454 



Stipules none. 



Herbs with rough-pubescent leaves LOASACEAE, 588 



Trees or shrubs STYRACACEAE, 649 



o. Stamens not more than twice as many as the petals u. 

 u. Stamens of the same number as the petals and opposite them. 



Ovaries 3-6, separate ; woody vines MENISPERMACEAE, 410 



Ovary only one. 

 Ovary 2-4-celled. 



Calyx-lobes minute or obsolete ; petals valvate VITACEAE, 562 



Calyx 4-5-cleft; petals involute RHAMNACEAE, 560 



Ovary 1-celled. 



Anthers opening by uplifted lids BERBERIDACEAE, 411 



Anthers not opening by uplifted lids. 



Style 1, unbranched ; stigma 1 PRIMULACEAE, 643 



Styles, style-branches, or stigmas more than 1. 

 Sepals or calyx-lobes 2 PORTULACACEAE, 387 



Sepals or calyx-lobes 3-5. 



Flowers monoecious Crotonopsis, 542 



Flowers perfect PLUMBAGINACEAE, 643 



u. Stamens not of the same number as the petals, or if of the same 



number alternate with them v. 

 v. Calyx free from the ovary, i.e. ovary wholly superior w. 



