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Helianthus is a genus of plant life comprising approximately 70 species. besides for three species in south the united states, all helianthus species are local to north America and vital the us. The not unusual names "sunflower" and "common sunflower" usually confer with the popular annual species helianthus annuus, whose spherical flower heads in combination with the ligules appear like the solar. this and different species, appreciably Jerusalem artichoke (h. Tuberous), are cultivated in temperate regions and some tropical regions as food plants for people, livestock, and poultry, and as decorative vegetation. the species h. Annuus normally grows over the summer and into early fall, with the height boom season being mid-summer.
Perennial sunflower species aren't as not unusual in lawn use because of their tendency to spread hastily and become aggressive. The whorled sunflower, helianthus verticillatus, become listed as an endangered species in 2014 while the U. S. Fish, and flora and fauna provider issued a final rule protecting it beneath the endangered species act. The number one threats are industrial forestry and pine plantations in Alabama, Georgia, and Tennessee. They grow to 1. 8 m (6 ft) and are mainly observed in woodlands, adjacent to creeks and moist, prairie-like areas. sunflowers originate within the Americas. They have been first domesticated in what is now Mexico and the southern u. S. A. domestic sunflower seeds were found in Mexico, dating to 2100 BCE. Local American human beings grew sunflowers as a crop from Mexico to southern Canada. within the 16th century the primary crop breeds have been brought from the USA to Europe via explorers.
Image Name: Sunflower Photos
Image category: Sunflower | Download Sunflower Zip
Parent category: Nature
Format: PNG image with alpha (transparent)
License: Creative Commons (CC BY-NC 4.0)
Author: Alexis Bailey
Date Added: 02-12-2017
PNG Downloads: 463
ICON Downloads: 162
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