Acacia hamiltoniana
| Hamilton's wattle | |
|---|---|
| In Morton National Park | |
| Scientific classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fabales |
| Family: | Fabaceae |
| Subfamily: | Caesalpinioideae |
| Clade: | Mimosoid clade |
| Genus: | Acacia |
| Species: | A. hamiltoniana
|
| Binomial name | |
| Acacia hamiltoniana | |
| Occurrence data from AVH | |
| Synonyms[1] | |
| |
Acacia hamiltoniana, commonly known as Hamilton's wattle,[2] is a species of flowering plant in the family Fabaceae and is endemic to New South Wales, Australia. It is an erect, bushy shrub with ascending to erect linear to lance-shaped or narrowly elliptic phyllodes, spherical heads of golden yellow flowers and firmly papery to thinly leathery, more or less black pods.
Description
Acacia hamiltoniana is an erect or spreading, bushy shrub that typically grows to a height of 0.5–3 m (1 ft 8 in – 9 ft 10 in) with glabrous, finely ribbed, dark red branchlets. Its phyllodes are mostly ascending to erect, variably shaped, linear to lance-shaped with the narrower end towards the base, or narrowly elliptic, 30–60 mm (1.2–2.4 in) long, 2.5–5 mm (0.098–0.197 in) wide and glaucous to subglaucous with a vein on each side. The flowers are borne in spherical heads in racemes 5–40 mm (0.20–1.57 in) long on peduncles 2.5–3.5 mm (0.098–0.138 in) long, each head with nine to fifteen golden yellow flowers. Flowering occurs in August and September and the pods are up to 55 mm (2.2 in) long and about 10 mm (0.39 in) wide, firmly papery to thinly leathery, glabrous and more or less black. The seeds are oblong to elliptic or egg-shaped, 4–5 mm (0.16–0.20 in) long, somewhat shiny black with a club-shaped aril.[2][3][4]
Taxonomy
Acacia hamiltoniana was first formally described in 1920 by the botanist Joseph Maiden in the Journal and Proceedings of the Royal Society of New South Wales, from specimens collected by Arthur Andrew Hamilton near Leura.[5][6] The specific epithet (hamiltoniana) honours Hamilton, who collected the type specimen in 1907.[2]
Distribution and habitat
Hamilton's wattle occurs on the Great Dividing Range and its foothills from near Rylstone and south to the Clyde River where it grows in sandy or loamy soils on sandstone outcrops in heath, Eucalyptus forest or woodland.[2][3]
See also
References
- ^ a b "Acacia hamiltoniana". Australian Plant Census. Retrieved 26 February 2026.
- ^ a b c d Kodela, Phillip G. "Acacia hamiltoniana". Royal Botanic Garden, Sydney. Retrieved 26 February 2026.
- ^ a b Maslin, Bruce R. "Acacia hamiltoniana". Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water: Canberra. Retrieved 26 February 2026.
- ^ "Acacia hamiltoniana". Australian Biological Resources Study. Retrieved 26 February 2026.
- ^ "Acacia hamiltoniana". Australian Plant Name Index. Retrieved 26 February 2026.
- ^ Maiden, Joseph H. (1920). "Notes on Acacias, No. IV, with descriptions of new species". Journal and Proceedings of the Royal Society of New South Wales. 53: 199–201. Retrieved 26 February 2026.