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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".
Zinnia grandiflora is a species of flowering plant in the family Asteraceae known by the common names Rocky Mountain zinnia and plains zinnia. [2] It is native to the southwestern and south-central United States (Kansas, Oklahoma, Texas, Colorado, New Mexico, Arizona) [3] and northern Mexico (Chihuahua, Coahuila, Sonora, Tamaulipas, Nuevo León, Zacatecas).
[5]: 17 [11] Fleshy roots and underground organs store food in the form of starches and sugars, allowing the plant to quickly grow when snow melts. [5] Many plants form flower buds during the summer before the summer that they open, allowing a quick bloom for the short growing season. [5]
Some flowers exhibit heliotropism, changing orientation to follow the sun. Others grow toward the position of the sun at noon. Others grow toward the position of the sun at noon. [ 5 ] [ 6 ] As the flower faces the sun it provides a resting spot for a variety of insects, being slightly warmer than surrounding surfaces. [ 7 ]
Flora typical of the Alpine Region of the Alps. The Alps are one of the great mountain range systems of Europe stretching approximately 1,200 kilometres (750 mi) across eight Alpine countries from Austria and Slovenia in the east, Switzerland, Liechtenstein, Germany, France to the west and Italy and Monaco to the south.
If it does occur, it normally happens to plants growing on exposed sites, where wind stress is increased. Alpine plants avoid water loss by deep rooting and increased stomatal control. Plants at low elevation normally reach a maximum stomatal opening in the morning while alpine plants reach maximum opening mid-day when the temperature is greatest.
Each flower has a tubular calyx of hairy sepals and a funnel-shaped corolla spreading to lobes. [5] The flowers are at full bloom for approximately one day apiece in the very short period of appropriate flowering conditions. [7] The plant has a strong scent reminiscent of urine which attracts pollinators to its short-lived flowers. [7]
The plants emerge at the edge of the melting snow and flower within a few days. The flowering time of R. adoneus is controlled by the time of snowmelt, so that on a steep gradient flowers appear first on a lower altitude and subsequently, with melting of the snow, several tens of meters higher. They are found at an altitude of 2500 – 4000 meters.