Thunbergia annua Nees

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Common names:
Frequency: Probably rare
Status: Possibly introduced or Native
Erect or decumbent annual herb; stem up to 25 cm long. Leaves opposite, oblong-ovate, 4-6 cm long, sparsely silvery hairy,particularly on the veins; margin with a pair of large teeth in the lower third and sometimes coarsely toothed towards the apex; petiole very short, 0-2 mm long, not winged but with the base of the leaf somewhat decurrent. Flowers solitary, axillary, on pedicels 3-6 mm long (up to 9 mm in fruit). Calyx finely velvety with scattered capitate glands. Corolla white with or without a pale yellow centre; tube cylindric for about 2 mm, opening to the throat for 7-10 mm and 3-5 mm wide at the apex; lobes 3-5 mm long; anthers c. 1.5 mm long, bearded at the base. Capsule depressed globose, 6-10 mm wide with a beak 8-12 mm long, densely velvety.
Notes: The very large disjunction in its distribution may possibly be due to a fairly recent introduction into Botswana possibly with cotton seed.
Derivation of specific name: annua: annual
Habitat: In grassland on clay soils and as a weed in cotton fields.
Altitude range: (metres) 1100 m (approx)
Flowering time:
Worldwide distribution: Disjunct distribution from Niger, Uganda, Sudan, Ethiopia, Kenya, Tanzania to western Zimbabwe and northern Botswana.
Zimbabwe distribution: W
Growth form(s):
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species

Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 15.

Vollesen, K. (2013). Acanthaceae (Part 1) Flora Zambesiaca 8(5) Pages 29 - 30.

Other sources of information about Thunbergia annua:

Our websites:

Flora of Botswana: Thunbergia annua

External websites:

African Plants: A Photo Guide (Senckenberg): Thunbergia annua
African Plant Database: Thunbergia annua
BHL (Biodiversity Heritage Library): Thunbergia annua
EOL (Encyclopedia of Life): Thunbergia annua
ePIC (electronic Plant Information Center): Thunbergia annua
Flora Zambesiaca web site: Thunbergia annua
GBIF (Global Biodiversity Information Facility): Thunbergia annua
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network): Thunbergia annua
iNaturalist: Thunbergia annua
IPNI (International Plant Names Index): Thunbergia annua
JSTOR Plant Science: Thunbergia annua
Kew Herbarium catalogue: Thunbergia annua
Mansfeld World Database of Agricultural and Horticultural Crops: Thunbergia annua
Plants of the World Online: Thunbergia annua
Tropicos: Thunbergia annua
Wikipedia: Thunbergia annua

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-23

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2023). Flora of Zimbabwe: Species information: Thunbergia annua., retrieved 29 March 2023

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