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An aster is a cellular structure shaped like a star, consisting of a centrosome and its associated microtubules during the early stages of mitosis in an animal cell. [1]: 221 Asters do not form during mitosis in plants. Astral rays, composed of microtubules, radiate from the centrosphere and look like a cloud. Astral rays are one variant of ...
Micrograph showing condensed chromosomes in blue, kinetochores in pink, and microtubules in green during metaphase of mitosis. In cell biology, the spindle apparatus is the cytoskeletal structure of eukaryotic cells that forms during cell division to separate sister chromatids between daughter cells.
Symphyotrichum (/ ˌ s ɪ m f aɪ ə ˈ t r ɪ k əm /) is a genus of over 100 species and naturally occurring hybrids of herbaceous annual and perennial plants in the composite family, Asteraceae, most which were formerly treated within the genus Aster.
Symphyotrichum is a genus of flowering plants in the tribe Astereae which includes the commonly cultivated New York aster (S. novi-belgii) and New England aster (S. novae-angliae). Its species are widespread in the Americas, including as far north as subarctic North America to as far south as Chile , Argentina , and the Falkland Islands .
Symphyotrichum ericoides (formerly Aster ericoides), with common names white heath aster, [4] frost aster, [5] and heath aster, [6] is a species of flowering plant in the family Asteraceae native to much of central and eastern North America. It has been introduced to parts of Europe and western Asia.
Symphyotrichum firmum (formerly Aster firmus), commonly known as shining aster, shiny-leaved aster, [3] smooth swamp aster, [4] and glossy-leaved aster, [5] is a species of flowering plant in the daisy family Asteraceae native to Canada and the United States.
Eurybia compacta, commonly known as the slender aster, is an herbaceous perennial native to the eastern United States from New Jersey to Georgia. [3] It is commonly found along the coastal plain in dry sandy soils, especially in pinelands. While it is not considered to be in high danger of extinction, it is of conservation concern and has most ...
Symphyotrichum ciliatum is a species of flowering plant in the family Asteraceae native to North America and eastern Eurasia.Commonly known as rayless annual aster and rayless alkali aster, it is an annual, herbaceous plant that may reach over 70 centimeters (2 feet 4 inches) in height.