Rhigozum
The Rhigozum are a genus of plants that belongs to the family of Bignoniaceae ( Bignoniaceae ). The seven their associated species are native to Africa and Madagascar.
Description
Rhigozum species are shrubs or small trees whose trunks are covered with spines and otherwise hairy hairless to fine. The deciduous leaves are arranged in individual pairs or in groups on small side shoots. They are easy to or consisting of a pair of part sheets.
The flowers appear singly in the axils or in few-flowered thyrsenartigen groups on short side shoots. The calyx is bell-shaped and filled with five teeth. The crown is white, pink or bright yellow, bell-shaped and decorated with five protruding Corolla lobe. The five stamens are about the crown out. The anthers are hairless, their counters are apart. Staminodes are not formed. The ovary is elongate elliptical, hairy and contains numerous ovules, which are two rows in the ovary subjects. The ovary is situated on a saucer - shaped flowers ground.
The fruits are elongated to elliptical, flattened capsules with hairless flaps. The cup is not resistant to the fruit. The seeds are winged.
Dissemination
Five of the seven Rhigozum species occur in tropical Africa, one species is native to Ethiopia and Somalia and another is found only in Madagascar.
System
Within the genus seven types can be distinguished:
- Rhigozum brevispinosum
- Rhigozum madagascariense
- Rhigozum obovatum
- Rhigozum somalense
- Rhigozum trichotomum
- Rhigozum virgatum
- Rhigozum ambesiacum