Trees, erect or scandent shrubs, or lianas. Leaves opposite or sometimes alternate or whorled; blades simple; petioles articulated at the base. Flowers 4-5-merous, bisexual, sessile or short-pedicellate, arranged in heads, racemes, spikes, or compound paniculiform inflorescences; bracts foliaceous or reduced. Calyx forming an infundibuliform, tubular, or cupular hypanthium that projects beyond the ovary, with the sepals on the distal portion of the hypanthium; corolla of free petals or absent; stamens 8-10, in one or two whorls, exserted or inserted; ovary inferior, with 2-6 ovules, the style simple, free or adnate to the hypanthium. Fruit dry, indehiscent or dehiscent, with 4 or 5 wings or ribs; seed one. About 270 species of tropical distribution, with numerous species in Africa.
Molecular Biology and Genetics
Statistics of barcoding coverage
Specimens with Sequences:477
Specimens with Barcodes:409
Species With Barcodes:97
Barcode data: Combretum cf. mkuzense
Statistics of barcoding coverage: Combretum cf. mkuzense
Public Records: 2
Specimens with Barcodes: 5
Species With Barcodes: 1
- "Schousboea" redirects here. As described by H.C.F. Schumacher and Peter Thonning, this is a synonym of Alchornea.
Combretum, the bushwillows or combretums, make up the type genus of the family Combretaceae. The genus comprises about 370 species of trees and shrubs, roughly 300 of which are native to tropical and southern Africa, about 5 to Madagascar, some 25 to tropical Asia and approximately 40 to tropical America. The genus is absent from Australia. Though somewhat reminiscent of willows (Salix) in their habitus, they are not particularly close relatives of these.
Bushwillow trees often are important plants in their habitat. Savannahs in Africa, in particular those growing on granitic soils, are often dominated by Combretum and its close relative Terminalia. For example C. apiculatum is a notable tree in the Angolan mopane woodlands ecoregion in the Kunene River basin in southern Africa.
Other species of this genus are a major component of Southwestern Amazonian moist forests. This genus contains several species that are pollinated by mammals other than bats, which is quite rare indeed. But most species are more conventionally pollinated by insects or birds.
Typhlodromus combretum, a mite of the family Phytoseiidae, was discovered on a bushwillow plant and is named after this genus. Other herbivores that eat Combretum foliage include the caterpillars of the Brown Awl (Badamia exclamationis) which is found on C. albidum, C. latifolium and C. ovalifolium; those of the Orange-tailed Awl (Bibasis sena) are recorded from C. extensum and C. latifolium.
Use by humans
Several species are used in African or Indian herbal medicine. The class of chemical compounds known as combretastatins were first isolated from South African Bushwillow (Combretum caffrum), from which they get their name. One synthetic derivative, fosbretabulin disodium (combretastatin A4 phosphate), underwent preliminary study for the treatment of anaplastic thyroid cancer, but it was not effective enough to progress to more advanced trials. C. molle is also recorded to contain antioxidants such as punicalagin, which is also found in pomegranates (Punica granatum), a somewhat related plant.
- C.Michael Hogan. 2012. Kunene River. Topic ed. P.Saundry. Encyclopedia of Earth. National Council for Science and the Environment. Washington DC.
- Carthew, S (1997). "Non-flying mammals as pollinators". Trends in Ecology & Evolution 12 (3): 104–108. doi:10.1016/S0169-5347(96)10067-7. ISSN 0169-5347.
- "Combretastatin A4 Phosphate in Treating Patients With Advanced Anaplastic Thyroid Cancer". clinicaltrials.gov.
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