angiorepro213-page6 - Carpels(Collectively called a pistil...

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Flowering Plant Reproduction - 6 Corolla The corolla is comprised of petals. Petals are usually "showy" in some way to attract a pollinator. Petals vary in pattern, shape, color, odor, size, etc. Typically, when we think of a flower, we are thinking of its petals. The calyx and corolla collectively form the perianth of the flower. In some monocots, such as lilies and tulips, the petals and sepals resemble each other. They are called tepals, although the petals and sepals can be told apart by their position within the flower. The perianth forms sterile appendages of the flower. Stamens The stamens are the male reproductive structures (modified sporophylls) and comprise the androecium. A stamen consists of: An anther, containing the microsporangia (usually four) A filament, the stalk that elevates the anther in the flower
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Unformatted text preview: Carpels (Collectively called a pistil – but that term is not used in this class) • The carpels are the female reproductive structures or gynoecium (modified megasporphylls folded lengthwise) • A carpel consists of: A stigma, the receptive surface A style, the stalk that elevates the stigma An ovary, which contains one or more ovules, the megasporangia Flower parts are genetically determined by pattern identity genes that are similar to the homeotic genes that determine pattern and placement in animals. Combinations of three genes are important in flower part determination. Botanists take advantage of this in horticulture to make “showier” flowers, by converting numbers of stamens into petals, for example....
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