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Pteronia Scabra
''Pteronia'' ("resin daisies") is a genus of evergreen, woody perennial plants assigned to the family Asteraceae with currently 76 described species. Like in almost all Asteraceae, the individual flowers are 5-merous, small and clustered in typical heads, surrounded by an involucre of bracts. In ''Pteronia'', the centre of the head is taken by relatively few, yellow, disc florets, while a ring of ligulate florets is absent. These florets sit on a common base (or receptacle). Taxonomy A species of Gombos was first described and assigned to the new genus ''Pteronia'' by the famous Swedish naturalist Carl Linnaeus in the second edition of his groundbreaking Species Plantarum, the starting point of modern botanical nomenclature, that was published in 1763. He had not seen living plants or dried herbarium specimens, but based his description on an etching made by the English botanist Leonard Plukenet in 1700. This etching probably represents ''Pteronia camphorata'', which has been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteronia Incana
''Pteronia incana'' ("Asbos" or "ash-bush") is a species of flowering plant in the family Asteraceae, indigenous to the Karoo regions of South Africa. Description This species has small, light grey, woolly, fragrant leaves, and forms a low, dense bush. Its fragrant leaves have a variety of medicinal uses. The flowerheads appear in Spring, at the tips of the branches. They are solitary, yellow, 15mm wide, with non-sticky yellow-green bracts, and small of coconut. Relatives It often co-occurs with its close relatives, ''Pteronia paniculata'' or ''Pteronia pallens'', both of which have distinctive yellow-green leaves. ''Pteronia glauca'' ("Boegoekaroo") is a very similar species, which also has light grey leaves. However, unlike ''P.incana'', its outer branches are always down-turned. Distribution and habitat The distribution of this species is in the south-western Cape of South Africa. It occurs throughout the Little Karoo and Robertson Karoo, northwards through the Tanqua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gland (botany)
In plants, a gland is defined functionally as a plant structure which secretes one or more products. This may be located on or near the plant surface and secrete externally, or be internal to the plant and secrete into a canal or reservoir. Examples include glandular hairs, nectaries, hydathodes, and the resin canals in Pinus. Notable examples Salt glands of the mangrove The salt glands of mangroves such as '' Acanthus'', '' Aegiceras'', '' Aegialitis'' and ''Avicennia'' are a distinctive multicellular trichome, a glandular hair found on the upper leaf surface and much more densely in the abaxial indumentum. On the upper leaf surface they are sunken in shallow pits, and on the lower surface they occur scattered among long nonglandular hairs composed of three or four cells. Development of the glands resembles that of the nonglandular hairs until the three-celled stage, when the short middle stalk cell appears. The salt gland continues to develop to produce two to four vacu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteronia Aspalatha
''Pteronia'' ("resin daisies") is a genus of evergreen, woody perennial plants assigned to the family Asteraceae with currently 76 described species. Like in almost all Asteraceae, the individual flowers are 5-merous, small and clustered in typical heads, surrounded by an involucre of bracts. In ''Pteronia'', the centre of the head is taken by relatively few, yellow, disc florets, while a ring of ligulate florets is absent. These florets sit on a common base (or receptacle). Taxonomy A species of Gombos was first described and assigned to the new genus ''Pteronia'' by the famous Swedish naturalist Carl Linnaeus in the second edition of his groundbreaking Species Plantarum, the starting point of modern botanical nomenclature, that was published in 1763. He had not seen living plants or dried herbarium specimens, but based his description on an etching made by the English botanist Leonard Plukenet in 1700. This etching probably represents '' Pteronia camphorata'', which has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biome
A biome () is a distinct geographical region with specific climate, vegetation, and animal life. It consists of a biological community that has formed in response to its physical environment and regional climate. In 1935, Tansley added the climatic and soil aspects to the idea, calling it ''ecosystem''. The International Biological Program (1964–74) projects popularized the concept of biome. However, in some contexts, the term ''biome'' is used in a different manner. In German literature, particularly in the Walter terminology, the term is used similarly as '' biotope'' (a concrete geographical unit), while the biome definition used in this article is used as an international, non-regional, terminology—irrespectively of the continent in which an area is present, it takes the same biome name—and corresponds to his "zonobiome", "orobiome" and "pedobiome" (biomes determined by climate zone, altitude or soil). In the Brazilian literature, the term ''biome'' is sometimes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nama Karoo
Nama Karoo is a xeric shrubland ecoregion located on the central plateau of South Africa and Namibia. It occupies most of the interior of the western half of South Africa and extends into the southern interior of Namibia. Climate The climate of the Nama Karoo tends to be volatile, unpredictable and rather harsh, with only the most specially-adapted organisms calling the region home. The annual ‘dry’ season—a time of blistering hot weather and drought A drought is a period of drier-than-normal conditions.Douville, H., K. Raghavan, J. Renwick, R.P. Allan, P.A. Arias, M. Barlow, R. Cerezo-Mota, A. Cherchi, T.Y. Gan, J. Gergis, D. Jiang, A. Khan, W. Pokam Mba, D. Rosenfeld, J. Tierney, ...—is long, often taking place over autumn and winter, and into early spring. Heavy rainfall primarily occurs in the spring and summer ‘wet’ season. This time of plenty can also vary, with total measured rainfall fluctuating between per year. Rainfall is also known to be hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Succulent Karoo
The Succulent Karoo is an terrestrial ecoregion, ecoregion defined by the World Wide Fund for Nature to include regions of deserts and xeric shrublands, desert in South Africa and Namibia, and a biodiversity hotspot. The geographic area chosen by the WWF for what they call 'Succulent Karoo' does not correspond to the actual Karoo. Geography The Succulent Karoo stretches along the coastal strip of southwestern Namibia and South Africa's Northern Cape Province, where the cold Benguela Current offshore creates frequent fogs. The ecoregion extends inland into the uplands of South Africa's Western Cape Province. It is bounded on the south by the Mediterranean climate fynbos, on the east by the Nama Karoo, which has more extreme temperatures and variable rainfall, and on the north by the Namib Desert. File:Succulent Karoo.svg, Succulent Karoo vegetation types File:Succulent Karoo legend.svg Flora The Succulent Karoo is notable for the world's richest flora of succulent plants, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Floristic Region
The Cape Floral Region is a floristic region located near the southern tip of South Africa. It is the only floristic region of the Cape Floristic Kingdom, and includes only one floristic province, known as the Cape Floristic Province. The Cape Floristic Region, the smallest of the six recognised Phytochorion, floral kingdoms of the world, is an area of extraordinarily high diversity and endemism, and is home to over 9,000 vascular plant species, of which 69 percent are endemic. Much of this diversity is associated with the fynbos biome, a Mediterranean-type, fire-prone shrubland. The economical worth of fynbos biodiversity, based on harvests of fynbos products (e.g. wildflowers) and eco-tourism, is estimated to be in the region of South African rand, R77 million (~United States dollar, US$5 million) a year. Thus, it is clear that the Cape Floristic Region has both economic and intrinsic biological value as a biodiversity hotspot. Location and description Home to the gre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
