The colour of the leaves is usually dark green. It is filled with white pith that often becomes hollow with age. [8], Perennial sunflower species are not as common in garden use due to their tendency to spread rapidly and become aggressive. Species Sunflower oil has become the world's second most important vegetable oil and is used for cooking and to make margarine, salad dressing, lubricants, paints and soaps. More than half the world's cultivated sunflowers are grown in Russia and Eastern Europe, where plant breeders in the 1930-1950s developed sunflower varieties with seeds containing nearly 50% oil and flower heads exceeding 30 cm in diameter. are collected into heads surrounded by bracts, is filament free, no Sunflowers are usually tall annual or perennial plants that in some species can grow to a height of 300 cm (120 in) or more. Note scale. As well as extraction of edible oil, seeds can be eaten raw or as salted or toasted snacks, and ground into a meal for using in bread and cakes, or they can be used as birdseed. An annual plant [(25–) 50–300 (–450) cm tall] with erect, usually rough to hairy stems and a relatively deep taproot; this weedy variety is highly variable, hybridizing with several other cultivated forms. on leaves branch, flowers come in multiples of 4 or 5. but there was an Aster, hence Asteraecae). Leaves are usually alternate (lower leaves opposite), ovate, cordate, with three main veins, 10-30 cm long, 5-20 cm wide, margin serrate, and carried on long petioles. under each flower head is a small grouping of leaflets, known as bracts. The petiolate leaves are dentate and often sticky.

Helianthus (/ˌhiːliˈænθəs/)[3] is a genus of plants comprising about 70 species. Helianthus: ray flowers are pointed, brown or yellow centers, falling water conducting cells, called tracheids, to conduct water throughout because it did not end in -aceae like all other plant families. [6] This and other species, notably Jerusalem artichoke (H. tuberosus), are cultivated in temperate regions and some tropical regions as food crops for humans, cattle, and poultry, and as ornamental plants. The ovary is inferior with a single basal ovule.

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Another technical feature that distinguishes the genus more reliably, but requires a microscope to see, is the presence of a prominent, multicellular appendage at the apex of the style. Moreover, the period of effective machinery use is limited. The 1000-kernel weight varies from 50 g to many times this. the plant and that show spiral bands in walls.

Eukaryota: multicellular organism with amembrane bound nucleus and other [16] Additionally, the season it is planted will have effects on its development. Dakota Indians made a broth of sunflower heads for a drink to relieve chest pains.

Elzebroek, T., Wind, K., 2008. When several references are cited, they may give conflicting information on the status. [18] Researchers have concluded that the soybean-sunflower method of plantation could be further improved through changes in fertilizer use.

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