Description[edit]
These are usually tall annuals, growing to a height of 50-390 or more cm.
The rough and hairy stem is branched in the upper part in wild plants but is usually unbranched in domesticated cultivars.
The petiolate leaves are dentate and often sticky. The lower leaves are opposite, ovate or often heart-shaped. The upper leaves are alternate and narrower.
They bear one or several to many wide, terminal capitula (flower heads), with bright yellow ray florets at the outside and yellow or maroon disc florets inside. Several ornamental cultivars have red-colored ray florets; all of them stem from a single original mutant.[7] During growth, sunflowers tilt during the day to face the sun, but stop once they begin blooming.
Helianthus species are used as food plants by the larvae of many Lepidoptera species
Description[edit]
These are usually tall annuals, growing to a height of 50-390 or more cm.
The rough and hairy stem is branched in the upper part in wild plants but is usually unbranched in domesticated cultivars.
The petiolate leaves are dentate and often sticky. The lower leaves are opposite, ovate or often heart-shaped. The upper leaves are alternate and narrower.
They bear one or several to many wide, terminal capitula (flower heads), with bright yellow ray florets at the outside and yellow or maroon disc florets inside. Several ornamental cultivars have red-colored ray florets; all of them stem from a single original mutant.[7] During growth, sunflowers tilt during the day to face the sun, but stop once they begin blooming.
Helianthus species are used as food plants by the larvae of many Lepidoptera species
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