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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.
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 .
Helianthus pumilus is a North American species of sunflower known by the common name little sunflower [1] or bush sunflower. [2] It is found in the western United States, primarily the Rocky Mountain region of Montana , Wyoming , and Colorado , with a few isolated populations in Utah and Idaho .
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.
The family is commonly known as the aster, daisy, composite, or sunflower family. Most species of Asteraceae are herbaceous plants, and may be annual, biennial, or perennial, but there are also shrubs, vines, and trees. The family has a widespread distribution, from subpolar to tropical regions, in a wide variety of habitats.
Commercially important plants in the Heliantheae include sunflower and Jerusalem artichoke. Many garden flowers are also in this group, such as Coreopsis, Cosmos, Echinacea, Rudbeckia, and Zinnia. Some authors separate Coreopsis and Cosmos into the Coreopsideae tribe. [1] In contrast to the benefits brought by the group, some are problematic weeds.
Helianthus maximiliani is a North American species of sunflower known by the common name Maximilian sunflower. [ 2 ] This sunflower is named for Prince Maximilian of Wied-Neuwied , who encountered it on his travels in North America.
Helianthus agrestis is a flowering plant that has bright orange-yellow rays. [6] Each plant can have about 10-15 rays and up to 50 disc florets. [5] The bright colors on this plant make it attractive to many pollinators. [7] The leaves of this plant are oval shaped and have a petiolate attachment and alternate on the stem.