實(shí)驗(yàn)花的構(gòu)造ppt課件(已修改)
2025-05-15 22:07 本頁面
【正文】 第五章 植物器官的結(jié)構(gòu)及組織分化 四、花 Flower 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 frui
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