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Helianthus giganteus, the giant sunflower or tall sunflower, is a species of Helianthus native to the eastern United States and eastern and central Canada, from Newfoundland west to Alberta south to Minnesota, Mississippi, and South Carolina.
Spiciform panicle that usually reaches 4 to 5 meters (13 to 16 feet) in height, but has a maximum recorded height of 8 meters (26 feet). The total height of the plant when blooming may reach 15 meters (49 feet). The stem at the base of the inflorescence may be 60–90 cm (24–35 in) in height and a very thick 20–40 cm (7.9–15.7 in). [17]
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.
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]
Structure of a plant cell. Plant cells are the cells present in green plants, photosynthetic eukaryotes of the kingdom Plantae.Their distinctive features include primary cell walls containing cellulose, hemicelluloses and pectin, the presence of plastids with the capability to perform photosynthesis and store starch, a large vacuole that regulates turgor pressure, the absence of flagella or ...
Wall stress relaxation is an important factor in cell wall expansion. Wall stress (measured in force per unit area) is created in response to the plant cell's turgor pressure . [ 2 ] Turgor pressure creates tension in the cell walls of plants, fungi, and bacteria, as it opposes the pressure of the cell's primary cell wall; this also allows for ...
The BBCH-scale (sunflower) identifies the phenological development stages of the sunflower (Helianthus annuus). It is a plant species specific version of the BBCH-scale . Phenological growth stages and BBCH-identification keys of sunflower
Rafflesia arnoldii, the world largest flower in Bengkulu - Indonesia. With a flower growing up to 1.5 m (5 ft) in diameter, 3–4 m (10–13 ft) in perimeter and 10–12 kg (22–26 lb) in weight, Rafflesia arnoldii is the world's current largest individual flower.