General Key to Families 13 



rage 

 38B. Ovules 1 or 2 in each locule of the ovary. 



39A. Stamens inserted on the calyx tube Fam. 166. Oleaceae, 728 



39B. Stamens inserted on the edge of the disc Fam. 155. Cornaceae, 686 



28B. Ovary superior; perianth hypogynous. 

 40A. Trees and shrubs. 



41A. Anthers opening by valves; plants commonly aromatic Fam. 95. Lauraccae, 469 



41B. Anthers longitudinally dehiscent. 



42A. Leaves with pellucid oil-glands Fam. 110. Rutaceae, 581 



42B. Leaves without pellucid oil-glands. 

 43A. Ovules several to many in each carpel. 



44A. Ovary 1-locular; stamens numerous, free Fam. HO. Flacourtiaceae, 642 



44B. Ovary 2- to many-locular; filaments united into a tube Fam. 134. Sterculiaceae, 625 



433. Ovules 1 or 2 in each carpel. 

 45A. Ovary 2- to many-locular. 



46A. Leaves pinnate, opposite Fam. 166. Oleaceae, 728 



46B. Leaves simple. 

 47A. Leaves alternate. 



48A. Styles 2; ovary 2-locular; capsules bifid Fam. 103. Hamamelidaceae, 516 



48B. Styles 3; ovary 3-locular; capsules not bifid Fam. 114. Euphorbiaceac, 588 



47B. Leaves opposite; flowers unisexual Fam. 116. Buxaceae, 595 



45B. Ovary 1-locular. 



49A. Stamens incurved in bud Fam. 68. Moraceae, 382 



49B. Stamens erect in bud. 



50A. Styles and stigmas 2 Fam. 67. Ulmaceae, 380 



50B. Style and stigma 1. 



51A. Stamens 4; filaments adnate to calyx tube Fam. 71. Proteaceac, 394 



51B. Stamens 8 or 10; filaments distinct Fam. 142. Thymelaeaceae, 643 



40B. Herbs or suflrutescent undcrshrubs. 

 52A. Ovary 2- to 3- or rarely 4-locular. 



53 A. Calyx-tube present Fam. 144. Lythraceae, 648 



53B. Calyx-tube absent. 



54A. Stamens tetradynamous; sepals 4; fruit usually a silique Fam. 98. Cruciferae, 479 



54B. Stamens equal in length; fruit a berry or capsule. 



55A. Fruit a berry; flowers perfect Fam. 81. Phytolaccaceae, 420 



55B. Fruit a capsule. 



56A. Flowers perfect; seeds minute and numerous Fam. 82. Aizoaceae, 421 



56B. Flowers unisexual; seeds relatively few. 



57A. Filaments thick and flat; evergreen procumbent herbs or subshrubs; flowers in spikes. 



Fam. 116. Buxaceae (Pachysandra) , 595 



57B. Filaments slender; plants of various habits Fam. 114. Euphorbiaceae, 588 



52B. Ovary 1-locular. 



58A. Stipules membranous, sheathing the stem above the nodes, ocreate; achene enclosed by persistent sepals. 



Fam. 78. Polygonaceae, 402 

 58B. Stipules not sheathlike and ocreate or absent. 

 SS-i^. Parasitic herbs without green parts. 



60A. Twining parasite on aerial parts of host plant; stems elongate, slender and branched. 



Fam. 95. Lauraceae (CawyMa), 470 

 60B. Erect parasites on roots of host plant; stems thick, short and simple, with few scales. 



61A. Flowers perfect, solitary, terminal; stems with opposite scales Fam. 76. Rafflesiaceae, 401 



61B. Flowers unisexual, numerous, minute, spicate; stems with alternate scales. 



Fam. 77. Balanophoraceae, 402 

 59B. Plants nonparasitic, with green leaves. 



62A. Sepals 2, mostly large and caducous Fam. 96. Papaveraceae, 474 



62B. Sepals 3-5, at least in male flowers, persistent. 

 63 A. Style or stigma 1. 



64A. Sepals united into an elongate tube. 



65A. Fruit an indchiscent nut, drupe or berry; ovary 1-locular and 1-ovuled. 



Fam. 142. Thymelaeaceae, 643 



65B. Fruit a capsule; ovary 1- to 6-locular with many ovules Fam. 144. Lythraceae, 648 



64B. Sepals distinct or nearly so. 



66A. Flowers unisexual; leaves simple. 



67a. Stamens many Fam. 152. Thcligonaceae, 152 



67B. Stamens 4-5. 



68A. Ovules basal and orthotropous; plant sometimes provided with stinging hairs. 



Fam. 69. Urticaceae, 386 

 68B. Ovules mostly pendulous and anatropous; plants without stinging hairs. 



Fam. 68. Moraceae, 382 

 66B. Flowers perfect. 



69A. Sepals persistent, united at base Fam. 104. Rosaceae, 517 



