Sweet thorn | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Fabales |
Family: | Fabaceae |
Subfamily: | Caesalpinioideae |
Clade: | Mimosoid clade |
Genus: | Vachellia |
Species: | V. karroo |
Binomial name | |
Vachellia karroo | |
Native range of V. karroo | |
Synonyms [2] | |
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Vachellia karroo, (synonym Acacia karroo) commonly known as the sweet thorn, common acacia, Karoo thorn, Cape gum or cockspur thorn, is a species of Vachellia , in the Mimosa sub-family (Mimosoideae) of the Fabaceae or pea family, which is native to southern Africa from southern Angola east to Mozambique, and south to South Africa. [3]
It is a shrub or small to medium-sized tree which grows to height of 12m. [4] It is difficult to tell apart from Vachellia nilotica subsp. adstringens without examining the seed pods. The Botanical Society of South Africa has accepted a name change to Vachellia karroo. [5]
Common names in various languages include doringboom, soetdoring, cassie, piquants blancs, cassie piquants blancs, deo-babool, doorn boom, kaludai, kikar, mormati, pahari kikar, umga and udai vel. [2]
It is a shrub or small to medium-sized tree which grows to height of 12m. Vachellia karroo has a rounded crown, branching fairly low down on the trunk. It is variable in shape and size, reaching a maximum of about 12m where there is good water. The bark is red on young branches, darkening and becoming rough with age. Sometimes an attractive reddish colour can be seen in the deep bark fissures The leaves are finely textured and dark green. The abundant yellow flowers appear in early summer, or after good rains. The seed pods are narrow, flat and crescent shaped. They are green when young becoming brown and dry. The pods split open allowing the seeds to fall to the ground. The formidable thorns are paired, greyish to white and are long and straight; up to ten inches (250 mm) in length, [6] the longest simple thorn of any Dicot.
It is a tree of open woodland and wooded grassland. It grows to its greatest size when rainfall of 800-900mm is received but can grow and even thrive in very dry conditions such as the Karoo region of western South Africa. The requirement here is for deep soils that allow its roots to spread. Everywhere in its range, however, the tree is easily recognised by its distinctive long white paired thorns and coffee coloured bark, both of which are very attractive. In the tropics it shows little variation but at the southern end of its range it becomes more variable in appearance.
Vachellia karroo has a life span of 30–40 years and is an adaptable pioneer, able to establish itself without shade, shelter or protection from grass fires. Once over a year old, seedlings can resprout after fire. Several fungi are associated with this tree and the crown of mature trees may be parasitized by various mistletoes, leading to the tree's decline. This tree has a long taproot which enables it to use water and nutrients from deep underground, this and its ability to fix nitrogen, lead to grasses and other plants thriving in its shade.
The tree has been noted to occur in the Torre del Mar area, near Malaga, Spain. Here it grows freely as a large shrub on waste ground. It has been used as hedging to keep out goats from vegetable plots. Flowers during July.
V. karroo is used for chemical products, forage, domestic uses, environmental management, fibre, food, drink, and wood. The tough wood is white to slightly yellowish in colour, rarely producing dark brown heartwood. It is widely cultivated in Asia, Australia, the Mediterranean region, India and the Indian Ocean area. [2] The large thorns mean that the tree must be approached, and the branches handled, carefully.
As is common in acacias, edible gum seeps from cracks in the tree's bark, and is an important part of the bushbaby's winter diet. The gum can be used to manufacture sweets (see Gum arabic) and used to have economic importance as "Cape Gum". In dry areas, the tree's presence is a sign of water, both above and underground. [7]
The tree is especially useful as forage and fodder for domestic and wild animals. Apparently, there is no risk of poisoning from it. Goats seem to like V. karroo better than cattle. [8] The small pom-pom shaped yellow flowers are attractive in mid-summer. The flowers make it a very good source of forage for honey bees; honey from it has a pleasant taste.
V. karroo is an excellent source of firewood and charcoal. [8] The wood is also used for fencing posts for cattle byres or kraals. The heartwood has a density of about 800 kg/m3. A tough rope can be made from the inside bark of the tree. [9]
This species, especially the bark (which can be chewed safely), is also used to treat oral thrush and ulcers. [10] The roots are also used medicinally. They may be chewed for use as an aphrodisiac or powdered and used for dizziness. [10] The gum, bark and leaves have been used as a soothing agent and astringent for colds, conjunctivitis and hemorrhage in other regions of Southern Africa. [11] The bark and leaves have also been used to treat convulsions and stomach problems (including nausea) and as a coagulant. [10]
The thorns were used by early naturalists to pin the insects they collected. It is very widespread throughout southern Africa and there are different forms in some places, which can be confusing. Vachellia karroo may be found from the Western Cape through to Zambia and Angola. In tropical Africa it is replaced by Vachellia seyal . The name acacia is derived from Greek "akis" a point or barb. Karroo is one of the old spellings of karoo which cannot be corrected because of the laws governing botanical nomenclature (giving of names). [11]
Vachellia karroo was introduced to Australia in 1967 as an ornamental plant. It then spread invasively, prompting large-scale efforts to eradicate it. [12] [4]
Acacia s.l., known commonly as mimosa, acacia, thorntree or wattle, is a polyphyletic genus of shrubs and trees belonging to the subfamily Mimosoideae of the family Fabaceae. It was described by the Swedish botanist Carl Linnaeus in 1773 based on the African species Acacia nilotica. Many non-Australian species tend to be thorny, whereas the majority of Australian acacias are not. All species are pod-bearing, with sap and leaves often bearing large amounts of tannins and condensed tannins that historically found use as pharmaceuticals and preservatives.
Neltuma juliflora is a shrub or small tree in the family Fabaceae, a kind of mesquite. It is native to Mexico, South America and the Caribbean. It has become established as an invasive weed in Africa, Asia, Australia and elsewhere. It is a contributing factor to continuing transmission of malaria, especially during dry periods when sugar sources from native plants are largely unavailable to mosquitoes.
Vachellia farnesiana, also known as Acacia farnesiana, and previously Mimosa farnesiana, commonly known as sweet acacia, huisache, casha tree, or needle bush, is a species of shrub or small tree in the legume family, Fabaceae. Its flowers are used in the perfume industry.
Vachellia tortilis, widely known as Acacia tortilis but now attributed to the genus Vachellia, is the umbrella thorn acacia, also known as umbrella thorn and Israeli babool, a medium to large canopied tree native to most of Africa, primarily to the savanna and Sahel of Africa, but also occurring in the Middle East.
Vachellia erioloba, the camel thorn, also known as the giraffe thorn, mokala tree, or Kameeldoring in Afrikaans, still more commonly known as Acacia erioloba, is a tree of southern Africa in the family Fabaceae. Its preferred habitat is the deep dry sandy soils in parts of South Africa, Botswana, the western areas of Zimbabwe and Namibia. It is also native to Angola, south-west Mozambique, Zambia and Eswatini. The tree was first described by Ernst Heinrich Friedrich Meyer and Johann Franz Drège in 1836. The camel thorn is a protected tree in South Africa.
Vachellia nilotica, more commonly known as Acacia nilotica, and by the vernacular names of gum arabic tree, babul, thorn mimosa, Egyptian acacia or thorny acacia, is a flowering tree in the family Fabaceae. It is native to Africa, the Middle East and the Indian subcontinent. It is also considered a 'weed of national significance' and an invasive species of concern in Australia, as well as a noxious weed by the federal government of the United States.
Vachellia nilotica subsp. adstringens is a perennial tree. It is not listed as being threatened. Some common names for it are cassie, piquants blancs and piquant lulu. Its geographic distribution includes Africa, Asia, the Indian Ocean area and the Middle East.
Vachellia horrida is a low spreading shrub or sometimes tree native to both the wet and dry scrublands of tropical to subtropical East Africa. Common names for it are Cape gum, Karroo Thorn and dev-babul. It is also found elsewhere in Africa, Asia, India and South America. It frequently has stipular spines 9.5 cm long. V. horrida is an important browse plant in the tropics, particularly during the dry season.
Vachellia seyal, the red acacia, known also as the shittah tree, is a thorny, 6– to 10-m-high tree with a pale greenish or reddish bark. At the base of the 3–10 cm (1.2–3.9 in) feathery leaves, two straight, light grey thorns grow to 7–20 cm (2.8–7.9 in) long. The blossoms are displayed in round, bright yellow clusters about 1.5 cm (0.59 in) diameter.
Vachellia sieberiana, until recently known as Acacia sieberiana and commonly known as the paperbark thorn or paperbark acacia, is a tree native to southern Africa and introduced into Pakistan. It is used in many areas for various purposes. The tree varies from 3 to 25 m in height, with a trunk diameter of 0.6 to 1.8 m. It is not listed as being a threatened species.
Faidherbia is a genus of leguminous plants containing one species, Faidherbia albida, which was formerly widely included in the genus Acacia as Acacia albida. The species is native to Africa and the Middle East and has also been introduced to Pakistan and India. Common names include apple-ring acacia, white acacia, and winter thorn. The South African name is ana tree.
Vachellia nilotica subsp. indica is a perennial tree native to Bangladesh, India, Myanmar, Nepal and Pakistan. It is also cultivated in Angola, Egypt, Ethiopia, and Tanzania. Common names for it include babul, kikar and prickly acacia.
Vachellia nilotica subsp. nilotica is a perennial tree native to Africa. It has also been introduced to the Indian Ocean area and to the Middle East.
Vachellia xanthophloea is a tree in the family Fabaceae, commonly known in English as the fever tree. This species of Vachellia is native to eastern and southern Africa. It has also become a landscape tree in other warm climates, outside of its natural range.
The black-tailed tree rat, also called black-tailed acacia rat or black-tailed thallomys,, is a species of rodent in the family Muridae. It is found in Angola, Botswana, Namibia and South Africa, where its natural habitat is subtropical or tropical dry shrubland. It is both nocturnal and arboreal and makes bulky nests in the trees, often acacias, where it feeds on leaves and buds.
Vachellia is a genus of flowering plants in the legume family, Fabaceae, commonly known as thorn trees or acacias. It belongs to the subfamily Mimosoideae. Its species were considered members of genus Acacia until 2009. Vachellia can be distinguished from other acacias by its capitate inflorescences and spinescent stipules. Before discovery of the New World, Europeans in the Mediterranean region were familiar with several species of Vachellia, which they knew as sources of medicine, and had names for them that they inherited from the Greeks and Romans.
Vachellia reficiens, commonly known as red-bark acacia, red thorn, false umbrella tree, or false umbrella thorn, is a deciduous tree or shrub of the pea family (Fabaceae) native to southern Africa, often growing in an upside-down cone shape and with a relatively flat crown.
Senegalia afra, also known as hook-thorn or Acacia afra, is a tree that occurs commonly in southern Africa. Though it is cultivated, it often occurs naturally in Gauteng suburban gardens, together with Acacia karroo and Acacia robusta.
Vachellia flava, synonym Acacia ehrenbergiana, is a species of drought-resistant bush or small tree, commonly known as salam in Arabic. It is found in the Sahara, the northern Sahel, parts of East Africa, the Arabian Peninsula and Iran.
Gymnosporia buxifolia is a species of plant in the bittersweet family (Celastraceae) native to southern Africa. It is commonly known as the pioneer spike-thorn or common spike-thorn. It ranges from Angola and Mozambique to South Africa.