APETALAE 13- 



Styles or stigmas 2 — 5. Embryo curved 72. Aizoaceae.. 



129. (118.) Flowers unisexual or polygamous 130 



Flowers hermaphrodite " 136 



130. Stamens 2. Ovary 2-celled with 2 ovules in each cell. Style i, with 2 



stigmas. Perianth 4-partite. Flowers polygamous. Leaves opposite, 



pinnate, exstipulate. Trees Fraxinus, 197. Oleaceae. 



Stamens 3 or more, rarely 2, but then flowers unisexual. Leaves simple 

 or digitate, rarely pinnate, but then alternate 131 



131. Leaves with a pitcher-shaped appendage. Style absent ; stigma 4-partite. 



Ovary 4-celled with numerous ovules in each cell. 



Nepenthes, 91. Nepenthaceae.. 

 Leaves without pitchers. Style present 132 



132. Style I, with 2 — 6 stigmas. Seeds exalbuminous. Leaves alternate, 



without stipules 134. Sapindaceae. 



Styles 2 or more, free at the base, towards the apex, or throughout. 133 



133. Perianth-segments valvate in bud, united below. Filaments united. 



144. Sterculiaceae^ 



Perianth-segments imbricate or open in bud, rarely valvate, but then free 



and filaments also free 134 



134. Ovules with ventral raphe, 2 in a cell. Fruit usually opening septicidally 



and loculicidally. Leaves usually stipulate. 122. Euphorbiaceae.. 

 Ovules with dorsal raphe. Shrubs or trees 135 



135. Flowers monoecious. Stamens 4 — 6. Ovary 3-celled with 2 ovules in 



each cell. Fruit a loculicidal capsule. Leaves opposite, without 



stipules 124. Buxaceae. 



Flowers dioecious or polygamous. Stamens 10 or more. Fruit a berry 

 or a drupe. Leaves alternate 159. Flacourtiaceae. . 



136. (129.) Perianth-segments free or nearly so. Stamens hypogynous or 



nearly so. 137 



Perianth-segments evidently united. Stamens usually perigynous. . 142 



137. Stem herbaceous or woody at the base only 138 



Stem woody throughout its length 140 



138. Perianth-segments 2 — 3. Stamens i — 4. Water-plants. 



93. Podostemonaceae. 

 Perianth-segments 4 — 5. Land-plants. Seeds with curved embryo. 139 



139. Perianth-segments 4. Stamens i — 6. Ovar3^-cells 2. Style i. Seeds 



exalbuminous. Leaves exstipulate 88. Cruciferae. 



Perianth-segments 5. Ovary-cells 3 — 7. Styles 3 — 7. Seeds albuminous. 

 Leaves stipulate 72. Aizoaceae. 



140. Ovary long-stalked. Perianth-segments 2 — 4, valvate or imbricate in 



bud ; in the latter case stamens 4 — 8. Seeds exalbuminous ; embryo 



curved 87. Capparidaceae. 



Ovary sessile or short-stalked. Stamens 10 or more. Seeds albuminous ; 

 embryo straight 14^ 



141. Perianth-segments s. valvate in bud. Grewia. 141. Tiliaceae.. 



