100. Anthers opening by valves. Perianth-segments 4 or 6. Seed without albumen. Trees or shrubs. =84. Lauraceae.= Anthers opening by longitudinal slits. 101 101. Stamens numerous. Flowers unisexual. Seed with copious fleshy albumen. Trees or shrubs. =83. Monimiaceae.= Stamens 8-10. 102 102. Style simple. Seed with a straight embryo and a fleshy albumen or without albumen. =171. Thymelaeaceae.= Styles 2. Seed with a curved embryo and mealy albumen. Flowers in panicles. _Galenia_, =72. Aizoaceae=. 103. (72.) Ovules basal or inserted upon a central placenta. 104 Ovules parietal or suspended from the apex of the cell. 108 104. Perianth of 2-3 minute scales. Ovules numerous, inserted upon a central placenta. Water-plants. =93. Podostemonaceae.= Perianth of 4-5 segments. 105 105. Flowers unisexual or polygamous, 4-merous. Ovules 2. Stigma 1. Seeds without albumen; embryo straight. Shrubs. Leaves alternate. _Empleurum_, =115=. =Rutaceae.= Flowers hermaphrodite. Seeds with mealy albumen; embryo more or less curved. Usually herbs. 106 106. Leaves alternate. Stamens 5. =68. Amarantaceae.= Leaves opposite or whorled. 107 107. Stigma 1, rarely stigmas 2, and then ovules 2-4. Stamens 5 or more, perigynous. =72. Aizoaceae.= Stigmas 3-5, more rarely 2, but then ovules numerous or stamens 1-3. =75. Caryophyllaceae.= 108. (103.) Ovules 2, suspended side by side from the apex of the cell or from a central placenta. Fruit drupaceous, usually one-seeded. 109 Ovules 2, one above the other, or more than 2, affixed to one or more parietal placentas. 112 109. Stamens as many as, and alternate with the perianth-segments. Leaves exstipulate. =132. Icacinaceae.= Stamens as many as, and opposite the perianth-segments, or in greater number. 110 110. Flowers hermaphrodite. Leaves exstipulate. =59. Olacaceae.= Flowers unisexual. Leaves stipulate. 111 111. Stamens very numerous. Perianth 4-5-parted. Flowers fascicled. _Guya_, =159. Flacourtiaceae=. Stamens 2-8, rarely more, but then perianth 6-8-parted. =122. Euphorbiaceae.= 112. Ovules 2 or more, attached to a single placenta. Stamens more or less perigynous. Fruit a legume. Leaves compound or reduced to the dilated foot-stalk, usually stipulate. =105. Leguminosae.= Ovules 3 or more, attached to 2 or more placentas, rarely to a single one, but then fruit a berry and leaves simple and undivided. 113 113. Style simple, or a sessile stigma. 114 Styles, style-branches, or sessile stigmas 2 or more. 116 114. Perianth-segments imbricate in bud. Stamens 10 or more. Ovary sessile. Seeds albuminous. =159. Flacourtiaceae.= Perianth-segments valvate in bud, more rarely imbricate, but then ovary stalked. Seeds exalbuminous. 115 115. Stamens more or less perigynous. Ovary sessile or short-stalked. Perianth-segments valvate in bud. Leaves exstipulate. Seeds with straight embryo. =173. Lythraceae.=