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Principles of Agricultural Science – Plant 1 Principles of Agricultural Science – Plant Flower Parts and Function Unit 4 – Anatomy and Physiology Lesson 4.5 Flower Power 2 Value of Flowers Human value: Aesthetics (Beauty) Career and SAE opportunities The USDA reports 2005 floriculture sales of $5.4 billion in the United States. Product Sales in 2005 Cut Flowers $396.7 million Potted Flowers and Plants Bedding and Garden Plants $809 million $626.6 million 3 Importance of Flowers Value to the plant – sexual reproduction Processes of sexual reproduction: Pollination Fertilization Seed development now begins 4 Parts of the Flower Let’s take a minute to review the following parts of the flower: Parker, 2004 5 Female Flower Parts • Ovule: The “egg cell” of the plant – becomes the seed when fertilized. • Pollen tube: Transfers pollen from stigma to ovule. • Pistil – Stigma (part of pistil): Collects pollen. – Style (part of pistil): Supports stigma. – Ovary (part of pistil): Contains one or more ovules. 6 Male Flower Parts • Anther: Develops and contains pollen. • Stamen: – Filament: Supports anther to assist with pollination. – Pollen: Male sex cell. 7 Supporting Parts • Petal: Protects pistil and stamens, and attracts insects for pollination. • Sepal: Outermost leaves protecting the flower during the bud stage. 8 Types of Flowers • Complete: Contains all major flower parts including petals, sepals and both reproductive organs. • Perfect: Includes both female and male reproductive parts. • Incomplete: Missing one or more of the sepals, petals, stamens, or pistils. • Imperfect: – Pistillate – Staminate 9 Pistillate Flowers • The flower is lacking stamens. The ear on a corn plant is an example of a pistillate flower. 10 Staminate Flowers • The flower is lacking a pistil. The tassel on a corn plant is an example of a staminate flower. 11 References Parker, R. (2004). Introduction to plant science (Rev. ed.). Clifton Park, NY: Delmar. Parker, R. (2010). Plant and soil science: Fundamentals and applications. Clifton Park, NY: Delmar. United States Department of Agriculture. (2006). Floriculture and nursery crops yearbook. Retrieved January 20, 2008, from http://usda.mannlib.cornell.edu/usda/ers/FLOyearbook//2000s/2006/FLO-yearbook-06-23-2006.pdf 12