Acacia nigrescens Oliv.

Selected images: Click on each image to see a larger version and details of the record View all images (14)

Acacia nigrescens

Photo: Bart Wursten
Victoria Falls

Acacia nigrescens

Photo: Petra Ballings
Rd to Chisumbanje, Save Valley

Acacia nigrescens

Photo: Petra Ballings
Rd to Chisumbanje, Save Valley

Acacia nigrescens

Photo: Petra Ballings
Rd to Chisumbanje, Save Valley

Acacia nigrescens

Photo: Petra Ballings
Rd to Chisumbanje, Save Valley

Acacia nigrescens

Photo: Petra Ballings
Rd to Chisumbanje, Save Valley

Detailed records: Display species records QDS maps by: Google Maps Point records by Google Maps

Species details: Click on each item to see an explanation of that item (Note: opens a new window)

Synonyms: Acacia pallens (Benth.) Rolfe
Senegalia nigrescens (Oliv.) P.J.H. Hurter
Common names: Knob thorn (English)
Status: Native
Medium to large, deciduous tree. Bark dark brown to almost black. The trunk and main branches often covered in numerous knobs,tipped with a hooked prickle. Thorns strongly hooked, in pairs at the nodes. Leaves with 2-3 pairs of pinna, each with only 1-2 pairs of oval to near-circular leaflets. Flowers in long spikes, white, sweetly scented, appearing in great profusion before the leaves. Pod straight, pointed at the apex, dark brown, dehiscent. Note: the leaflets are the largest of any Acacia. See A. burkei and A. mellifera for comparison.
Derivation of specific name: nigrescens: 'becoming black', thought to refer to either the colour of the thorns or the pods
Habitat: In hot and dry woodland and wooded grassland.
Altitude range:
Flowering time:Aug - Oct
Worldwide distribution: From Tanzania to KwaZulu-Natal and West to Botswana and the Caprivi of Namibia.
Malawi distribution: N,C,S
Growth form(s): Tree.
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species

Brenan, J.P.M. (1970). Mimosoideae Flora Zambesiaca 3(1) Pages 69 - 71.

Burrows, J.E., Burrows, S.M., Lötter, M.C. & Schmidt, E. (2018). Trees and Shrubs Mozambique Publishing Print Matters (Pty), Cape Town. Page 203. (Includes a picture).

Chapano, C., Mugarisanwa, N.H. (2003). Plants of the Matobo District National Herbarium and Botanic Garden, Zimbabwe Page 2.

Coates Palgrave, K. et al. (1956). Trees of Central Africa National Publications Trust, Salisbury. Pages 250 - 253. (Includes a picture).

Curtis, B.A. & Mannheimer, C.A. (2005). Tree Atlas of Namibia National Botanic Research Institute, Windhoek Pages 168 - 169. (Includes a picture).

Drummond, R.B. (1972). A list of Rhodesian Legumes. Kirkia 8(2) Page 214.

Drummond, R.B. (1975). A list of trees, shrubs and woody climbers indigenous or naturalised in Rhodesia. Kirkia 10(1) Page 241.

Heath, A. & Heath, R. (2009). Field Guide to the Plants of Northern Botswana including the Okavango Delta Kew Publishing Page 258. (Includes a picture).

Mannheimer, C. & Curtis B. (2009). Le Roux and Müller's Field Guide to the Trees and Shrubs of Namibia Macmillan Education, Windhoek, Namibia. Pages 110 - 111. (Includes a picture).

Roodt, V. (1998). Trees and Shrubs of the Okavango Delta Shell Field Guide Series: Part I Shell Oil Botswana, Gaberone. Pages 170 - 173. (Includes a picture).

Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 60.

Steedman, E.C. (1933). Some Trees, Shrubs and Lianes of Southern Rhodesia. Pages 13 - 14.

Timberlake, J., Fagg, C. & Barnes, R. (1999). Field Guide to the Acacias of Zimbabwe CBC Publishing, Harare Pages 90 - 930. (Includes a picture).

Timberlake, J.R. & Childes, S.L. (2004). Biodiversity of the Four Corners Area: Technical Reviews Volume Two (Chapter 5-15) Appendix 5-1: Plant Checklist Occasional Publications in Biodiversity 15 Page 210.

Other sources of information about Acacia nigrescens:

Our websites:

Flora of Botswana: Acacia nigrescens
Flora of Caprivi: Acacia nigrescens
Flora of Mozambique: Acacia nigrescens
Flora of Zambia: Acacia nigrescens
Flora of Zimbabwe: Acacia nigrescens
Flora of Zimbabwe: cultivated Acacia nigrescens

External websites:

African Plants: A Photo Guide (Senckenberg): Acacia nigrescens
African Plant Database: Acacia nigrescens
Biodiversity Explorer (Biodiversity of southern Africa): Acacia nigrescens
BHL (Biodiversity Heritage Library): Acacia nigrescens
EOL (Encyclopedia of Life): Acacia nigrescens
ePIC (electronic Plant Information Center): Acacia nigrescens
Flora Zambesiaca web site: Acacia nigrescens
GBIF (Global Biodiversity Information Facility): Acacia nigrescens
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network): Acacia nigrescens
IPNI (International Plant Names Index): Acacia nigrescens
Ispot Southern Africa: Acacia nigrescens
JSTOR Plant Science: Acacia nigrescens
Kew Herbarium catalogue: Acacia nigrescens
Mansfeld World Database of Agricultural and Horticultural Crops: Acacia nigrescens
The Plant List (version 1.1): Acacia nigrescens
Tropicos: Acacia nigrescens

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2014-19

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2019). Flora of Malawi: Species information: Acacia nigrescens., retrieved 24 May 2019

Site software last modified: 3 April 2018 9:36pm
Terms of use