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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 .
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.
Perennial sunflower is a crop of sunflowers that are developed by crossing wild perennial and domestic annual sunflower species.. Annual sunflower is a major oilseed crop. Genes from wild perennial relatives may increase root depth and mass and extend the growing season.
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.
The succulent leaves of the sunflower stores water in absorbent, spongy portions of the leaves. Helianthus anomalus also has large seeds and rapid root growth, which contribute to its ability to survive in its extreme environment. [3] It is believed that large seeds are adaptive to dune plants because the large seed size prevents burial by the ...
The genus Helichrysum / h ɛ l ɪ ˈ k r aɪ s əm / consists of an estimated 600 species of flowering plants in the sunflower family ().The type species is Helichrysum orientale.They often go by the names everlasting, immortelle, and strawflower.
Helianthus debilis is a species of sunflower known by the common names cucumberleaf sunflower, beach sunflower, weak sunflower, [2] and East Coast dune sunflower. [3] It is native to the United States, where it can be found along the Atlantic and Gulf Coasts . [ 4 ]
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