White Rose Internal Shadows Macro-1 :: SX50 HS :: IMG_0184 - Version 2

I never took a biology course, and I regret that! Perhaps I can learn a bit now... Let's consider this my first Lab.

Lesson 1 :

Fact #1 Complete flowers generally have multiple stamens, but only one pistil.

I'm lost already...;)) I took some photos oaf a white rose in my garden this morning. Do you see the female part called the pistil? All these look similar, so they must be the multiple male stamens with the pollen.
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Here is a guide to the reproductive parts of flowering plants, including supporting structures:

homeguides.sfgate.com/flowers-petals-sepals-stamens-pisti...

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Flowers are intricate structures that contain the reproductive parts of plants. Completeness in the floral world doesn’t refer to the successful formation of flowers, but it defines blossoms that contain certain components. When a flower contains all four primary structures -- petals, sepals, stamens and a pistil -- it is botanically “complete.”

Plant Reproductive Structures
Plant sexual reproduction relies on stamens, which are the male parts, and pistils, which are the female parts. Stamens contribute the male genetic material in the form of pollen, which is produced from anthers that are on the terminal ends of stalks called filaments. Pistils form ovaries at their bases and stigmas, which are sticky pollen receptors, on the terminal ends of stalks called styles. Inside the ovaries, ovules are tiny structures that contain female genetic material. When fertilized, ovules form viable seeds that perpetuate second-generation flowers.

Supporting Structures
Petals and sepals protect and support plant reproductive structures as they develop. Multiple sepals, collectively called the calyx, form the outermost whorl of a flower. Sepals protect a flower bud before it opens and support it after it blooms. Sepals often resemble small green or brown leaves that are arranged around the base of flowers, but sometimes they are larger and more colorful like the petals. Multiple petals, collectively called the corolla, comprise the innermost whorl of a flower. Petals attract pollinators with their colors, fragrances and patterns.

Complete Flowers
Some plants produce separate male and female flowers; sometimes they're on the same plant and other times they're borne on different plants. When flowers contain both male and female parts within the same blossom, they are botanically “perfect” and do not require another plant for successful pollination. Some plants don’t form distinct petals and sepals, but they have one undifferentiated whorl comprised of structures called tepals. Petals, sepals, stamens and pistils are not formed on all flowers, but when they do the flower is said to be “complete.”

Examples
Roses (Rosa spp.) and lilies (Lilium spp.) are flowering ornamentals that have complete flowers. Many fruit trees, such as lemons and limes (Citrus spp.), also have complete flowers, but some fruit trees, such as persimmons (Diospyros spp.), include species that have complete flowers and others that do not. Generally, American persimmon trees (D. virginiana) have either male or female flowers, and Oriental persimmon trees (D. kaki) have perfect, complete flowers. Tomatoes (Lycopersicon spp.) have complete flowers, but they set more fruit with “buzz pollination,” which is bee activity inside the flowers that loosens pollen from the male anthers and shakes it onto the female styles.

Considerations
The existence of male and female parts in the same flower is not a guarantee that successful pollination will occur. Although they are capable of self-pollination, most perfect flowers still depend on a pollinator, which could be an insect or the wind, to transfer pollen from the anthers to the stigmas. After transfer is successful, pollen grains must travel down the style to reach the ovary before fertilization occurs. Using chemical sprays on plants when flowers are blooming can kill insects, preventing or reducing successful pollination.

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Taken on: June 14, 2015

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Plant Reproductive Structures

Stamens

Pistils

Petals

Sepals

Anthers

Pollen

Stalks

Filaments

Stigmas

Styles

Calyx

Whorl

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