Blooming sunflower, Helianthus sp.

Blooming sunflower, Helianthus sp.

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Credit: DUNBAR ARNOLD/AGSTOCKUSA/SCIENCE PHOTO LIBRARY

Caption: Sunflower. Blooming sunflower, Helianthus sp.. The plant produces composite flowers: the small, true flowers are clustered into a compact, round head which resembles a single flower. The sunflower heads bend towards the sun because a chemical, auxin, builds up in the shaded part of the stem causing these parts to grow more quickly. Sunflowers can be grown in dry soils from the equator to 55 degrees latitude. The plant is widely cultivated for its seeds which are used to make oil and as food for livestock. Photographed in Colorado, USA.

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Keywords: botany, flower, flowering, flowers, helianthus sp., nature, plant, plants, sunflower, type

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