Black-eyed Susan
| Black-eyed Susan | ||||||||||||
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Black-eyed Susan |
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| Thunbergia alata | ||||||||||||
| Bojer ex Sims |
The Black-eyed Susan ( Thunbergia alata ) is a native of southeast Africa plant species from the family of the Acanthaceae (Acanthaceae).
description
Black-eyed Susanne is an anticlockwise - like the bindweed family - twisting, annual cultivated, herbaceous climbing plant and reaches heights of 1 to 2 meters. The three and a half to seven and a half centimeters long and two and a half centimeters wide leaves are triangular to heart-shaped. Their edges are wavy and both surfaces are hairy. The leaf blades sit on up to six and a half centimeters long petioles , which attach at a distance of four and a half to 13 centimeters on the one to one and a quarter millimeter thick stem axis .
The hairy, mostly orange-yellow flowers grow on up to eight and a half centimeters long inflorescence axes . The central two centimeter long corolla tube is black-violet. Each of the solitary flowers has two triangular to oval, hairy bracts that taper towards the outside. They are 18 to 20 millimeters long and nine to ten millimeters wide. The serrated calyx is about two millimeters long and has between 15 and 17 awl-shaped lobes. The corolla tube measures around four centimeters and shows five two centimeter large corolla lobes with right-hand covering buds.
The 16 to 18 millimeter long fruits are finely haired. They have a diameter of seven millimeters at the base. The four seeds measure 3.5 millimeters.
The number of chromosomes is 2n = 18.
distribution
It is originally found in tropical and southern Africa in the countries Ethiopia, Eritrea, Sudan, Kenya, Tanzania, Uganda, Rwanda, Mozambique, Malawi, Botswana, South Africa, Swaziland, Ivory Coast, Liberia, Sierra Leone and Nigeria and is often in the tropics a neophyte .
photos
Longitudinal section through the flower
Chalice and stylus
blossoms
literature
- Berling, Rainer: Handbuch Garten , BVL Verlagsgesellschaft mbH, Munich 1997, ISBN 3-405-15098-1
- LH Durkee: Family # 200: Acanthaceae . In: William Burger (Ed.): Flora Costaricensis . Fieldiana: Botany, new series, number 18, Field Museum of Natural History, Chicago, USA, 1986. page 85.
Individual evidence
- ↑ Thunbergia alata at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ^ Thunbergia in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved December 16, 2018.
