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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".
Mandevilla / ˌ m æ n d ɪ ˈ v ɪ l ə / [3] is a genus of tropical and subtropical flowering vines belonging to the family Apocynaceae.It was first described as a genus in 1840. [4] A common name is rocktrumpet.
Flower heads facing east, away from the late afternoon sun. A common misconception is that flowering sunflower heads track the Sun across the sky. Although immature flower buds exhibit this behaviour, the mature flowering heads point in a fixed (and typically easterly) direction throughout the day.
Firmiana simplex, commonly known as the Chinese parasol tree, Chinese parasoltree, or wutong (Chinese: 梧桐; pinyin: wútóng), is an ornamental plant of tree size assigned to the family Malvaceae that was formerly in the family Sterculiaceae in the order Malvales, and is native to Asia. It grows up to 16 m (52 ft) tall.
Doellingeria umbellata, known by the common names tall flat-topped white aster, parasol whitetop, [2] or tall white-aster, [3] is a North American plant species in the family Asteraceae. It is native to Canada (from Alberta to Newfoundland ), St. Pierre and Miquelon , and the eastern and north-central United States (from Nebraska and the ...
Since flowers do not have pulvini, the movement is caused by increased growth rate of the stems. [16] [18] The growth rate accumulation of the stem on the east side of the stem gradually pushes the flower from east to west during daytime. This matches with the Sun as it rises from the east and falls in the west.
When cut young and dried, the open flowers and stalks preserve their colour and shape for long periods. Helichrysum italicum (synonym Helichrysum angustifolium ) is steam distilled to produce a yellow-reddish essential oil popular in fragrance for its unique scent, best described as herbaceous, sweet, and honey-like.
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.
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