130. Stamens 2. Ovary 2-celled with 2 ovules in each cell. Style 1, 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 1, 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 1-4. Water-plants. =93. Podostemonaceae.= Perianth-segments 4-5. Land-plants. Seeds with curved embryo. 139 139. Perianth-segments 4. Stamens 1-6. Ovary-cells 2. Style 1. 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. 141 141. Perianth-segments 5, valvate in bud. _Grewia_, =141. Tiliaceae=. Perianth-segments; 3-8, imbricate or open in bud. =159. Flacourtiaceae.= 142. (136.) Styles or sessile stigmas 2-5. Seeds albuminous; embryo curved. =72. Aizoaceae.= Style 1 or a sessile stigma. Seeds exalbuminous or with a straight embryo. 143 143. Stigmas or stigma-lobes 1-2. Ovules numerous in each ovary-cell. 144 Stigmas or stigma-lobes 4. Ovules 2-4 in each ovary-cell. Flowers 4-merous. Leaves opposite, stipulate. 145 144. Stamens 1-16. Ovary sessile or short-stalked. Embryo straight. Leaves without stipules. =173. Lythraceae.=