angiorepro213-page7

angiorepro213-page7 - Stamens and sepals may also fuse....

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Flowering Plant Reproduction - 7 Variations in flower structure are important to the classification of the 250,000 or so flowering plants. Each of these variations has its proliferating vocabulary that students must learn in order to understand flower structure and flower parts, and is essential when one wants to learn to identify the different kinds of flowering plants. We shall introduce some of the basic variations in Biology 213. The number of each kind of flower part is a common variation, and is used to readily distinguish monocot flowers from dicot flowers. Fusion of flower parts is common. Carpels, especially the ovaries, typically fuse; you will read about a 3- parted ovary or 5-parted ovary, which means that the flower has 3 or 5 ovaries that have fused together. When petals fuse, we say the flower is sympetalous. Polypetalous flowers do not have fused petals.
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Unformatted text preview: Stamens and sepals may also fuse. Different flower parts can also fuse, such as stamens fusing to petals. The term, adnate is used when this occurs. Flowers that have all four floral parts are said to be complete. Those lacking one or more are incomplete. Flowers that have both stamens and carpels, the sexual organs, are said to be perfect. Plants that produce perfect flowers are bisexual. A flower lacking either stamens or carpels is imperfect. Imperfect flowers are either staminate or carpellate. If a single plant has both staminate and carpellate flowers, it is monoecious; corn is an example of a monoecious plant. A plant that produces just staminate or just carpellate flowers is dioecious; examples include holly, Impatiens , and the Katsura tree. Monoecious Corn Plant Dioecious Sagittaria latifolia (Flowers are on separate plants)...
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