Information about Nectar Guide
Nectar guides are patterns seen in some flowers that guide pollinators to the nectar and pollen. These patterns may be visible to humans; for instance, the Dalmatian toadflax (Linaria genistifolia) has yellow flowers with orange nectar guides.[1] However in some plants, such as sunflowers, they are visible only under ultraviolet light. Under ultraviolet, the flowers have a darker center, where the nectaries are located, and often specific patterns upon the petals as well. This is believed to make the flowers more attractive to pollinators such as honey bees and other insects that can see ultraviolet. This page on butterflies shows an animated comparison of black-eyed Susan (Rudbeckia hirta) flowers in visible and UV light.
External links
- Dalmatian Toadflax from the Southwest Exotic Plant Information Clearinghouse
- What do butterflies see? (speculation)
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Nectar is a sugar-rich liquid produced by plants. It is produced either by the flowers, in which it attracts pollinating animals or by or extrafloral nectaries, which provide a nutrient source to animal mutualists providing anti-herbivore protection.
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Pollen is a fine to coarse powder consisting of microgametophytes (pollen grains), which produce the male gametes (sperm cells) of seed plants. The pollen grain with its hard coat protects the sperm cells during the process of their movement between the stamens
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Linaria
Species
About 100 species; see text
Linaria is a genus of about 100 species of herbaceous annuals and perennials that was traditionally placed in the foxglove family Scrophulariaceae.
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Species
About 100 species; see text
Linaria is a genus of about 100 species of herbaceous annuals and perennials that was traditionally placed in the foxglove family Scrophulariaceae.
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H. annuus
Binomial name
Helianthus annuus
L.
The sunflower (Helianthus annuus
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Binomial name
Helianthus annuus
L.
The sunflower (Helianthus annuus
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Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than soft X-rays. It is so named because the spectrum starts with wavelengths slightly shorter than the wavelengths humans identify as the color violet
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Light is electromagnetic radiation of a wavelength that is visible to the eye (visible light). In a scientific context, the word "light" is sometimes used to refer to the entire electromagnetic spectrum.
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A pollinator is the biotic agent (vector) that moves pollen from the male anthers of a flower to the female stigma of a flower to accomplish fertilization or syngamy of the female gamete in the ovule of the flower by the male gamete from the pollen grain.
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The factual accuracy of part of this article is disputed.
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The dispute is about whether the species/subspecies treatment of Engel (1999) has been accepted by the scientific community.
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Insecta
Linnaeus, 1758
Orders
Subclass Apterygota
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Linnaeus, 1758
Orders
Subclass Apterygota
- * Archaeognatha (bristletails)
- * Thysanura (silverfish)
- * Infraclass Paleoptera (Probably paraphyletic)
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R. hirta
Binomial name
Rudbeckia hirta
L.
Rudbeckia hirta (common names: Black-eyed Susan, Blackiehead, Brown Betty, Brown Daisy, Brown-eyed Susan, Gloriosa Daisy, Golden Jerusalem,
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Binomial name
Rudbeckia hirta
L.
Rudbeckia hirta (common names: Black-eyed Susan, Blackiehead, Brown Betty, Brown Daisy, Brown-eyed Susan, Gloriosa Daisy, Golden Jerusalem,
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