Sunflower
The sunflower (Helianthus annuus) is an annual plant native to the Americas in the family Asteraceae, with a large flowering head (inflorescence). The stem of the flower can grow as high as 3 metres tall, with the flower head reaching up to 30 cm in diameter with the "large" seeds. The term "sunflower" is also used to refer to all plants of the genus Helianthus, many of which are perennial in the bud stage exhibit heliotropism. At sunrise, the faces of most sunflowers are turned towards the east. Over the course of the day, they move to track the sun from east to west, while at night they return to an eastward orientation. This motion is performed by motor cells in the pulvinus, a flexible segment of the stem just below the bud. As the bud stage ends, the stem stiffens and the blooming stage is in the blooming stage are not heliotropic anymore. The stem has frozen, typically in an eastward orientation. The stem and leaves lose their green wild sunflower typically does not turn toward the sun; its flowering heads may face many directions when mature. However, the leaves typically exhibit some heliotropism.
Size: 5400px × 3600px
Location: Ooty Tamilnadu India
Photo credit: © Chinju@digipix / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: angiosperms, annualplant, annuus, anthophyta, asteraceae, asterales, beautiful, bloom, blossom, brightyellow, class, color, colorful, colour, compositae, family, fields, flower, floweringhead, floweringplants, flowerplant, flowers, garden, gardening, genus, helianthus, heliotropism., india, inflorescence, kingdom, leaves, magnoliophyta, magnoliopsida, nilgiris., ooty, order, plant, plantae, southindia, stem, sunflower, tamilnadu, yellowcolor
