16 General Key to Families 



Page 



131 A. Petals inserted on top of the calyx -tube. 



132A. Filaments geniculate and inflexed Fam. 148. Melastomataceae, 652 



132B. Filaments not geniculate Fam. 144. Lythraceae, 648 



131B. Petals free from the calyx. 



133A. Fruit lobed and beaked Fam. 106. Geraniaceae, 577 



133B. Fruit of more or less separate carpels, not lobed or beaked. . Fam. 101. Saxifragaceac, 498 

 127B. Plants woody, trees or shrubs. 

 134A. Leaves alternate. 

 135A. Leaf-blades simple. 



136A. Ovules numerous in each locale of the ovary. 

 137A. Anthers opening by terminal pores. 



138A. Anthers erect in bud; carpels when 3 the other floral parts 3- or 6-merous. 



Fam. 159. Ericaceae, 693 

 138B. Anthers inverted in bud; sepals and petals 5; ovary 3-locular with a 3-lobulate style. 



Fam. 157. Clethraceae, 690 



137B. Anthers opening by slits Fam. 102. Pittosporaceae, 515 



136B. Ovules 1- or 2 in each locule of the ovary. 

 139A. Stamens opposite the petals. 



140A. Sepals valvate Fam. 129. Rhamnaceae, 614 



HOB. Sepals imbricate in bud Fam. 127. Sabiaceae, 612 



139B. Stamens alternate with the petals. 



141A. Fruit a capsule or samara; flowers provided with a disc. . . . Fam. 121. Celastraceae, 601 



141B. Fruit drupaceous; flowers without a disc Fam. 120. Aquifoliaceae, 598 



135B. Leaf-blades compound. 



142A. Ovary deeply lobed Fam. 111. Simaroubaceae, 585 



142B. Ovary not lobed. 



143A. Stamens united into a tube Fam. 112. Meliaceae, 585 



143B. Stamens free. 



144A. Stamens rising inside the disc Fam. 126. Sapindaceae, 611 



144B. Stamens inserted on or under the edge or rim of an annular intrastaminal disc. 



Fam. 119. Anacardiaceae, 596 

 134B. Leaves opposite. 

 145 A. Leaves simple. 



146A. Fruit a winged samara. 



147A. Stamens usually 8; flowers with a disc; fruit a pair of adnate samaras. 



Fam. 124. Aceraceae, 607 

 147B. Stamens 2; flowers without a disc; fruit a single samara. 



Fam. 166. Oleaceae (Fraximus), 728 

 146B. Fruit capsular or baccate, rarely with protrusions suggesting wings. 

 148A. Anthers opening by pores; filaments geniculate and inflexed. 



Fam. 148. Melastomataceae, 652 

 148B. Anthers opening lengthwise; filaments not geniculate. 



149A. Stamens as many as the petals and opposite them Fam. 129. Rhamnaceae, 614 



149B. Stamens as many as the petals or fewer and alternate with them. 



Fam. 121. Celastraceae, 601 

 145B. Leaves compound. 



150A. Fruit an inflated capsule or berry; stipules paired Fam. 122. Staphyleaceae, 605 



150B. Fruit a samara; stipules none Fam. 124. Aceraceae (Acer, in part), 607 



121B. Ovary 1-locular. 



151 A. Flowers zygomorphic. 



152A. Calyx gamosepalous; fruit a legume, 1-carpellate Fam. 105. Leguminosae, 551 



152B. Calyx-lobes free; carpels 2 to many. 



153A. Sepals and petals 5; carpels 3-5 Fam. 139. Violaceae, 633 



153B. Sepals 2 or sometimes almost absent; petals 4; carpels 2 Fam. 96. Papaveraceae, 474 



151B. Flowers actinomorphic. 



154A. Anthers mostly dehiscing by valves Fam. 92. Berberidaceae, 461 



154B. Anthers not opening by valves. 



155A. Sepals 2 Fam. 96. Papaveraceae, 474 



155B. Sepals more than 2. 

 156A. Sepals 4; leaves simple. 



157A. Woody plants with berrylike fruit; stamens 8 Fam. 141. Stachyuraceae, 643 



157B. Herbs; fruit a silique or rarely a loment; stamens 6, tetradynamous Fam. 98. Cruciferae, 479 



156B. Sepals 5. 



158A. Fruit a legume Fam. 105. Leguminosae, 551 



158B. Fruit an achene or follicle Fam. 104. Rosaccae, 517 



76B. Ovary inferior to semi-inferior. 



159A. Stamens many, more than twice as many as the petals. 



160A. Sepals 2; capsule circumscissile Fam. 83. Portulacaceae, 422 



160B. Sepals 4 or more; fruit dehiscing otherwise. 



