夏日里四种家居软装风格布局.ppt

* * 第五章 植物器官的结构及组织分化 四、花 Flower 酒店设计 The duckweeds (family Lemnaceae) are the smallest flowering plants; their struc- tural features mark them as extremely reduced relatives of the aroid family (Araceae), the family that includes calla lilies (Zantedeschia) and Philodendron. (a) A honeybee resting on a dense float- ing mat of three species of duckweed. The larger plants are Lemna gibba, about 2 to 3 millimeters long; the smaller ones are two species of Wolffia, up to 1 milli- meter long. (b) A flowering plant of W. borealis, with a circular concave stigma (looking like a tiny doughnut) and a min- ute anther just above it, both protruding from a central cavity. The whole plant is less than 1 millimeter long. (c) Flower- ing plant of L. gibba; two stamens and a style protrude from a pocket on the upper surface of the plant. Monocots. (a) A member of the palm family, ily, the coconut palm (Cocos nuci- fera), grozoing in Tehuantepec, Oaxaca, Mexicon. The fruit of coconut is a drupe, not a nut (see Chapter 19). (b) Flowers and fruits of the banana plant (Musa X paradisiaca). The banana flower has an in- ferior ovary, and the tip of the fruit bears a large scar left by the fallen flower parts . (c) Rice (Oryza sativa) is a member of the grass family. function of the leaves. (c) Round-lobed hepatica (Hepatica americana), which flowers in deciduous woodlands in the early spring. The flowers have no petals but have six to ten sepals and numerous spirally arranged stamens and carpels. (b) Saguaro cactus (Carnegiea gigantea). The cacti, of which there are about 2000 species, are almost exclusively a New World family. The thick, fleshy stems, which store water, contain chloroplasts and have taken over the photosynthetic 穗状花序 伞形花序 伞房花序 总状花序 圆锥花序 柔荑花序 复伞形花序 头状花序 肉穗花序 （一）花的组成与基本结构 花 花柄 Pedicel 花托 Receptacle 花被 Perianth 雄蕊群 Androecium 雌蕊群 Gynoecium 1、花柄和花托 下位花 周位花 上位花 2、花被 花萼 Calyx 花冠 Corolla 萼片：由薄壁组织、维管系统及表皮层组成 Sepal 表皮层上有气孔和表皮毛 花瓣：由薄壁组织、维管系统及表皮层组成 Petal