Download Flower Parts and Function

Principles of Agricultural Science – Plant
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Principles of Agricultural Science – Plant
Flower Parts and Function
Unit 4 – Anatomy and Physiology
Lesson 4.5 Flower Power
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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
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Importance of Flowers
Value to the plant – sexual reproduction
Processes of sexual reproduction:
Pollination
Fertilization
Seed development now begins
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Parts of the Flower
Let’s take a minute to review the following
parts of the flower:
Parker, 2004
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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.
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Male Flower Parts
• Anther: Develops and contains pollen.
• Stamen:
– Filament: Supports anther to assist with
pollination.
– Pollen: Male sex cell.
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Supporting Parts
• Petal: Protects pistil and stamens, and attracts
insects for pollination.
• Sepal: Outermost leaves protecting the flower
during the bud stage.
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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
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Pistillate Flowers
• The flower is lacking stamens.
The ear on a corn
plant is an
example of a
pistillate flower.
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Staminate Flowers
• The flower is lacking a pistil.
The tassel on a
corn plant is an
example of a
staminate
flower.
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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
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