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Viola is a genus of flowering plants in the violet family Violaceae. It is the largest genus in the family, containing over 680 species. Most species are found in the temperate Northern Hemisphere; however, some are also found in widely divergent areas such as Hawaii, Australasia, and the Andes. Some Viola species are perennial plants, some are ...
Violaceae is a family of flowering plants established in 1802, consisting of about 1000 species in about 25 genera. It takes its name from the genus Viola, the violets and pansies . Older classifications such as the Cronquist system placed the Violaceae in an order named after it, the Violales or the Parietales.
Violet identifies various plant taxa, particularly species in the genus Viola, within which the common violet is the best known member in Eurasia and the common blue violet and common purple violet are the best known members in North America, but also: Various species of Barleria, including: Barleria cristata, Philippine violet
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Stem rot, also known as pansy sickness, is a soil-borne fungus and a possible hazard with unsterilized animal manure. The plant may collapse without warning in the middle of the season. The foliage will flag and lose color. Flowers will fade and shrivel prematurely. Stem will snap at the soil line if tugged slightly.
Viola sororia is a short-stemmed, herbaceous perennial plant that grows in well-drained and shady habitats. [5] This 15–25 centimeters (6–10 in) wide violet has glossy, heart-shaped leaves and are topped with purple flowers with white throats. The lower three petals are hairy and the stem of the flower droops slightly. [7]
Streptocarpus ionanthus flowers. Streptocarpus sect. Saintpaulia is a section within Streptocarpus subgenus Streptocarpella[ 1] consisting of about ten species of herbaceous perennial flowering plants in the family Gesneriaceae, native to Tanzania and adjacent southeastern Kenya in eastern tropical Africa.
Graphene ( / ˈɡræfiːn / [ 1]) is a type of allotrope of carbon consisting of a single layer of atoms arranged in a honeycomb [ 2][ 3] nanostructure. [ 4] The name is derived from "graphite" and the suffix -ene, reflecting the fact that the graphite allotrope of carbon contains numerous double bonds. Each atom in a graphene sheet is ...