Acacia mearnsii De Wild.

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Acacia mearnsii

Photo: Bart Wursten
Misty Manor Hotel Site, Vumba

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Synonyms:
Common names: Black wattle (English)
Frequency: Locally abundant in the E Highlands
Status: Introduced
Description:
Unarmed shrub or small tree, to 15 m. Leaves: rhachis bearing glands on upper side, not only at the junction of each pair of pinnae but at other points as well. Leaves with c.12-20 pairs of pinnae; leaflets to 4 mm, numerous. Flowers pale yellow. Pods beaded, with 3-12 segments.
Notes: A very fast growing species, flowering and producing large amounts of seeds within a year. The germination of the seeds is stimulated by fires. It is very similar to A. dealbata, another Australian invader, which lacks the glands between the top pairs of pinnae. The leaves of A. dealbata are grey-green, giving the trees a much lighter appearance than A. mearnsii. When in flower, the two species are more easily separated as the flowers of A. dealbata are bright yellow, while those of A. mearnsii are very pale yellow or cream. Also see A. melanoxylon for comparison.
Derivation of specific name:
Habitat: An aggressive invader of grasslands and forest margins in high rainfall areas of Zimbabwe and South Africa.
Altitude range: (metres) Above 1200 m
Flowering time:Sep
Worldwide distribution: Native of Australia; naturalised in southern Africa.
Zimbabwe distribution: E
Growth form(s): Tree.
Endemic status:
Red data list status:
Insects associated with this species: Chiasmia simplicilinea (Food plant)
Ericeia inangulata (Larval food plant)
Pseudoradiarctia scita (Larval food plant)
Achaea catella (Larval food plant)
Heniocha apollonia (Larval foodplant)
Gynanisa maja (Larval foodplant)
Catalebeda cuneilinea (Larval foodplant)
Spot characters: Display spot characters for this species
Images last updated: Monday 17 October 2005
Literature:

Biegel, H.M. (1977). Check-list of ornamental plants used in Rhodesian parks and gardens. Rhodesia Agricultural Journal. Research Report No. 3. Page 17.

Brenan, J.P.M. (1970). Mimosoideae Flora Zambesiaca 3(1) Pages 111 - 112.

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.

Timberlake, J., Fagg, C. & Barnes, R. (1999). Field Guide to the Acacias of Zimbabwe CBC Publishing, Harare Pages 140 - 141. (Includes a picture).


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Other sources of information about Acacia mearnsii:

Our websites:

Flora of Mozambique: Acacia mearnsii
Flora of Mozambique: cultivated Acacia mearnsii
Flora of Zimbabwe: cultivated Acacia mearnsii

External websites:

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


Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-17

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2017). Flora of Zimbabwe: Species information: Acacia mearnsii.
http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=126030, retrieved 23 November 2017

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