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A cellular model is a mathematical model of aspects of a biological cell, for the purposes of in silico research. Developing such models has been a task of systems biology and mathematical biology .
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
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.
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. [4]
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]
Schweinitz's sunflower grows from 3 to 13 feet (1 to 4 meters) tall. It usually grows to about 6.5 feet and sometimes reaching heights of 16 feet. The sunflower produces tubers and rhizomes underground. Its stems are purple and usually solitary, branching only at or above mid-stem.
The leaves have large teeth along the edges (hence the name, sawtooth) to occasionally nearly entire and the tips are pointed. [6] The head (formally composite flower) is 3 to 4 inches (7–10 cm) wide with golden-yellow disk flowers that bloom in summer and autumn. The 10-20 yellow ray florets are about 1.5 inches (3.81 cm) long.
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]