Helianthus or sunflowers is a genus of plants comprising about 70 species in the family Asteraceae.
The common name, “sunflower,” also applies to the popular annual species Helianthus annuus, the common sunflower. This and other species, notably Jerusalem artichoke (H. tuberosus), are cultivated in temperate regions as food crops and ornamental plants. unflowers are usually tall annuals, that grow to a height of 50–400 centimetres (20–157 in).
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.
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