Flowers - PowerPoint PPT Presentation

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Flowers

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  1. Flowers

  2. Flowers • Location of sex organs of plant • Some may be showy to attract pollinators while others are not • The number of certain parts indicates if it is a dicot or monocot • Flowers consist of whorls of parts

  3. Flower Parts • Peduncle • Stem that solitary flowers on • Receptacle • Where all flower parts are attached Peduncle Receptacle

  4. Flower Parts • Sepals • Normally non-colored leaves of flower • Non-fertile • If colored, called “tepals • Calyx • All sepals together Sepals = Calyx

  5. Flower Parts • Petals • Colored leaves of flower • Non-fertile • Used to attract pollinators • Corolla • All petals together Petals = Corolla

  6. Flower Parts • Perianth • Consists of both non-fertile whorls • Calyx + Corolla Petals = Corolla Perianth Sepals = Calyx

  7. Flower Parts • Male Parts • Filament • Stalk that bears the Anther • Anther • Pollen bearing organ Filament Stamen • Stamen • Filament + Anther

  8. Flower Parts • Female Parts • Stigma • Sticky pad for pollen to adhere to Stigma Style • Style • Long, slender portion for pollen to grow through Ovary • Ovary • Where the ovules (“eggs”) are • Pistil • Stigma + Style + Ovary Stigma + Style + Ovary = Pistil

  9. Monocot vs. Dicot • Monocots and dicots can be most easily determined by their male / female parts • Monocots • Flower parts are in 3s • Dicots • Flower parts are in 4s, 5s, or many

  10. Classification of Flowers • Complete • Flower has all 4 whorls of organs • Sepals, petals, stamen, pistil • Incomplete • If flower is missing at least one of the whorls of organs

  11. Classification of Flowers • Perfect • If the flower has both sex whorls • Stamen + Pistil • Imperfect • If either sex whorl is missing • Pistillate • Only pistils are present • Staminate • Only stamen are present

  12. Classification of Flowers • Monecious • A plant with both pistillate and staminate flowers on it • Ex. Oak, corn, begonias • Dioecious • A species with staminate and pistillate flowers on separate plants • Ex. Asparagus, holly, Ginkgo

  13. Flowers can either be borne singly or in inflorescences Inflorescence A cluster of flowers often looking like one flower Some examples Umbel Raceme Panicle Corymb Placement

  14. Placement Umbel Panicle Corymb