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Helianthus (/ ˌ h iː l i ˈ æ n θ ə s /) [3] is a genus comprising around 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. [ 4 ] [ 5 ] Except for three South American species, the species of Helianthus are native to North America and Central America .
The plant has an erect rough-hairy stem, reaching typical heights of 3 metres (10 feet). The tallest sunflower on record achieved 9.17 m (30 ft 1 in). [3] Sunflower leaves are broad, coarsely toothed, rough and mostly alternate; those near the bottom are largest and commonly heart-shaped.
This is a list of plants organized by their common names. However, the common names of plants often vary from region to region, which is why most plant encyclopedias refer to plants using their scientific names , in other words using binomials or "Latin" names.
Helianthus giganteus is a perennial herbaceous plant native to the northern United States and southern Canada that can grow up to 1–3 metres (3.3–9.8 ft) tall with instances to 4m (13 feet). The leaves are approximately 1 inch wide by 7 inches long, and partly rough.
Helianthus devernii is a North American species of flowering plant in the daisy family Asteraceae, known by the common name Red Rock sunflower.The perennial herbaceous plant is endemic to a portion of Nevada's Red Rock Canyon National Conservation Area measuring less than 1 acre (4,000 m 2), where it grows in just two desert spring locations within the Mojave Desert.
Helianthus divaricatus, commonly known as the rough sunflower, [3] woodland sunflower, [4] or rough woodland sunflower, [5] is a North American species perennial herb in the family Asteraceae. It is native to central and eastern North America , from Ontario and Quebec in the north, south to Florida and Louisiana and west to Oklahoma and Iowa .
Helianthus mollis grows on prairies, roadsides, dry open woods, rocky glades, fields, and thickets. [3] It is a perennial herbaceous plant up to 1.5 m (4.9 ft) tall, spreading by means of underground rhizomes. The leaves are mostly along the stem rather than crowded near the base, each egg-shaped with teeth along the edges.
A branching perennial herb, growing from a stout rhizome and reaches heights from 0.5–3.0 m (1 + 1 ⁄ 2 –10 ft). The rough, slender, tall, erect stems and alternately arranged leaves are covered in rough hairs. [2] The lance-shaped leaves are narrow, rough, pointed, and folded down the midvein, and up to 30 cm (12 in) long on large plants. [2]