159. Ovule inverted. Stamens as many as and alternating with the perianth-segments. Seeds exalbuminous; embryo straight. =226. Compositae.= Ovule incurved. Stamens as many as and opposite the perianth-segments or more. Seeds albuminous; embryo curved. Herbs. 160 160. Flowers unisexual. Perianth-segments 2-4, valvate in bud. Stamens 10-30. Stigma 1. Fruit drupaceous. _Cynocrambe_, =70. Cynocrambaceae=. Flowers hermaphrodite. Perianth-segments 5, imbricate in bud. Stamens 5. Stigmas 2-5. Fruit opening by a lid or bursting irregularly. 161 161. Style short, with long stigmas. Leaves alternate, exstipulate. Flowers in spike-or panicle-like inflorescences. _Beta_, =67. Chenopodiaceae.= Style long, with 2 short stigmas. Leaves opposite, linear, stipulate. Flowers in heads. _Sclerocephalus_, =75. Caryophyllaceae=. 162. (155.) Ovule straight. Style simple. Stamen 1. Flowers polygamous. Reddish-brown herbs, parasitic upon roots. Leaves reduced to scales. _Cynomorium_, =184. Cynomoriaceae=. Ovule incurved or inverted. Green plants. Leaves well developed. 163 163. Flowers unisexual or polygamous. Stamens as many as and opposite the perianth-segments or fewer. 164 Flowers hermaphrodite. Stamens as many as and alternate with the perianth-segments or more. Leaves exstipulate. 166 164. Anthers opening by longitudinal slits. Flowers unisexual. Leaves stipulate. =53. Moraceae.= Anthers opening by valves. Leaves exstipulate. 165 165. Flowers unisexual. Leaves penninerved. _Hypodaphnis_, =84. Lauraceae=. Flowers polygamous. Leaves palminerved. _Gyrocarpus_, =85. Hernandiaceae=. 166. Stamens 2. Styles 2. Embryo straight. Leaves radical. _Gunnera_, =183. Halorrhagaceae.= Stamens 3-5. Styles 4, or a single style. Embryo curved. Leaves alternate. =72. Aizoaceae.= 167. (154.) Ovules 2-5. 168 Ovules numerous. 174 168. Ovules adnate to the ovary-wall. Stamens 2-6. Shrubs parasitic on the stem of trees. =61. Loranthaceae.= Ovules free from the ovary-wall. Plants growing on the ground or parasitic upon roots. 169 169. Ovules suspended from the apex of the ovary-cell. Stamens 8-10, rarely 4-5. Seeds exalbuminous. Shrubs or trees. Flowers in spikes, racemes, or heads. =179. Combretaceae.= Ovules inserted on a central, sometimes subparietal, placenta. Seeds albuminous. 170 170. Styles 4. Ovules 4. Stamens 4. Perianth of the male flowers consisting of calyx and corolla. Herbs or undershrubs. _Laurembergia_, =183. Halorrhagaceae=. Style 1. Perianth of all flowers simple. 171 171. Stigma 6-10-lobed. Stamens 5. Albumen ruminate. Shrubs or trees. _Octoknema_, =60. Octoknemataceae=. Stigma entire or 2-5-lobed. 172 172. Stamens 8, twice as many as the perianth-segments. Embryo with inferior radicle. Shrubs. Leaves opposite. _Grubbia_, =58. Grubbiaceae=. Stamens 2-6, as many as, or fewer than, the perianth-segments. Embryo with superior radicle or undivided. 173 173. Stem and leaves or scales green. Embryo with 2 cotyledons. =56. Santalaceae.=