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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 .
The common sunflower (Helianthus annuus) is a species of large annual forb of the daisy family Asteraceae. The common sunflower is harvested for its edible oily seeds , which are often eaten as a snack food .
There are eight different species that cause yield loss of sunflowers; however, Alternaria helianthi is the primary causal agent and most widespread. [5] The main hosts are sunflowers (Helianthus annuus); however, it has been proven that safflower (Carthamus tinctorius), noogoora burr (Xanthium pungens), cocklebur (Xanthium strumarium), and Bathurst burr (Xanthium spinosum) can serve as ...
The name is derived from the genus Helianthus, which is Greek for sun flower. Most genera and species are found in North America (particularly in Mexico) and South America. A few genera are pantropical. Most Heliantheae are herbs or shrubs, but some grow to the size of small trees. Leaves are usually hairy and arranged in
Heliotropism, a form of tropism, is the diurnal or seasonal motion of plant parts (flowers or leaves) in response to the direction of the Sun. The habit of some plants to move in the direction of the Sun, a form of tropism, was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium, meaning "sun turn".
Assassin bug, lacewing, parasitic wasp, yellow jacket and other predatory wasps: Leek moth, onion fly [13] Dill, parsnip, radish: Tomatoes grow better with carrots, but may stunt the carrots' growth. Beans provide the nitrogen carrots need more than some other vegetables. Aromatic companion plants repel carrot fly. Alliums inter-planted with ...
This guide explains the most common reasons for peace lily leaves turning yellow and provides simple tips to help your plant recover. 1. Watering Stress. Overwatering and underwatering are, hands ...
Helianthus strumosus, the pale-leaf woodland sunflower, [3] is a species of sunflower native to North America east of the Great Plains and is in the family Asteraceae. [4] It is a native perennial sunflower that resembles other members of this family including the Pale Sunflower (H. decapetalus), Woodland Sunflower (H. divaricatus), Hispid Sunflower (H. hirsutus), and Jerusalem Artichoke (H ...