Rhigozum
| Rhigozum | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Rhigozum obovatum |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Rhigozum | ||||||||||||
| Burch. |
The rhigozum are a plant genus that the family of Bignoniaceae belongs (Bignoniaceae). The seven species belonging to it are native to Africa , Madagascar and Yemen .
description
Rhigozum species are shrubs or small trees whose trunks are studded with spines and otherwise hairless to finely hairy. The leaves are opposite in single pairs or in groups on small side shoots. They are simple or consist of a pair of partial leaves.
The flowers stand individually in the armpits or in little-flowered thyrsenic - like groups on short side shoots. The chalice is bell-shaped and has five teeth. The crown is white, pink or bright yellow, bell-shaped and set with five protruding crown lobes. The five stamens are slightly above the crown. The dust bags are hairless, their counters are apart. Staminodes are not formed. The ovary is elongated elliptical, hairy and includes a plurality of seed plants , which are in two rows in the ovary compartments. The ovary stands on a saucer-shaped flower base .
The fruits are elongated to elliptical, flattened capsules with hairless flaps. The calyx is not permanent on the fruit. The seeds are winged.
distribution
Five of the seven Rhigozum species are found in tropical South Africa , one species is native to Somalia , Djibouti and Yemen; another occurs exclusively in Madagascar .
Systematics
Seven species are distinguished within the genus:
- Rhigozum brevispinosum Kuntze : The home is tropical and southern Africa.
- Rhigozum madagascariense Drake : The home is southwestern Madagascar.
- Rhigozum obovatum Burch. : The home is Zimbabwe to southern Africa.
- Rhigozum somalense Hallier f. : The homeland is Somalia, Djibouti and Yemen.
- Rhigozum trichotomum Burch. : The homeland extends from Angola to further south.
- Rhigozum virgatum Merxm. & A. Write. : The homeland is southwestern Angola and northwestern Namibia.
- Rhigozum zambesiacum Baker : The homeland extends from Mozambique to southern Africa.
supporting documents
Individual evidence
- ↑ Lucia G. Lohmann and C. Ulloa Ulloa: Bignoniaceae . In: iPlants prototype checklist . Retrieved from www.iplants.org on February 15, 2009.
- ↑ a b c d e f g h Rafaël Govaerts (Ed.): Rhigozum - data sheet at World Checklist of Selected Plant Families of the Board of Trustees of the Royal Botanic Gardens, Kew. Last accessed on March 3, 2015.
literature
- E. Fischer, I. Theisen and LG Lohmann: Bignoniaceae . In: Klaus Kubitzki, Joachim W. Kadereit (eds.): Flowering Plants, Dicotyledons: Lamiales (except Acanthaceae Including Avicenniaceae) , Springer Verlag, 2004. ISBN 978-3-540-40593-1 . P. 20.
