Acacia equisetifolia | |
---|---|
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. equisetifolia |
Binomial name | |
Acacia equisetifolia | |
Acacia equisetifolia is a small shrub in the genus Acacia . It is endemic the Northern Territory, [4] and is critically endangered under the Commonwealth Environment Protection and Biodiversity Conservation Act 1999, [1] [4] being known only from Graveside Gorge in the Kakadu National Park, where it grows on sandstone slopes and ledges at the tops of sheer cliffs. [5] It flowers in February, with near-mature pods observed as being present in March, August and October. [5] [3]
Acacia equisetifolia is an erect grey-green shrub [4] growing up to 1 m tall. The branchlets are densely villous with the weak hairs being about 1 mm long and white and slightly curved. The narrow needle-like phyllodes are arranged in whorls with from 10 to 17 per whorl, and each from 10 to 20 mm long, slender (0.3–0.4 mm wide), and ascending to erect when young, and when old, patent (at about right angles to the supporting stem). They are terete, almost terete or flattish, and a dull green, and tipped with a small point (from 0.1 to 0.3 mm long). The nerves are not visible. The peduncles are mostly from 15 to 30 mm long, and villous as on the branchlets. The inflorescence is globular [4] and has from 30 to 35 flowers, each of which has a very small calyx and is 5-merous. The sessile pods are short (10–30 mm long, 8–10 mm wide), flat but obviously raised over seeds, straight to slightly curved, blackish, viscid, and hairy. The seeds are transverse to oblique in the pods. [5]
It was first formally described in 2014 by Bruce Maslin and Ian Cowie in Nuytsia . [2] [3]
The species epithet, equisetifolia, alludes to the similarity of the phyllodes in their shape and arrangement to species of the genus, Equisetum L. [3]
Assessment against the IUCN criteria [6] [7] has led to the species being listed under both Commonwealth [1] and Northern Territory [8] legislation as critically endangered. [3] It is threatened because of its very low extent and area of occurrence, extreme fluctuations in numbers, and unfavourable fire regimes for a possibly obligate seeder, placing it at risk of rapid extinction. [3] [8]
Acacia acanthoclada, commonly known as harrow wattle, is a low, divaricate, highly branched and spinescent shrub that is endemic to Australia.
Acacia cerastes is a shrub belonging to the genus Acacia. It is native to a small area in the northern Wheatbelt region of Western Australia.
Acacia pterocaulon is a shrub belonging to the genus Acacia and subgenus Alatae. It is native to a small area in the Mid West region of Western Australia.
Acacia aptaneura, commonly known as slender mulga, is a shrub belonging to the genus Acacia and the subgenus Juliflorae. It is native to central and western parts of Australia.
Acacia arcuatilis is a shrub belonging to the genus Acacia and the subgenus Juliflorae that is endemic to south western parts of Australia.
Acacia dacrydioides is a shrub belonging to the genus Acacia and the subgenus Juliflorae that is endemic to north western Australia.
Acacia gibbosa is a shrub or tree belonging to the genus Acacia and the subgenus Juliflorae native to Western Australia.
Acacia sibina is a tree or shrub belonging to the genus Acacia and the subgenus Juliflorae the is endemic to parts of western Australia.
Acacia claviseta, also known as the club-tipped whorled wattle, is a shrub belonging to the genus Acacia and the subgenus Lycopodiifoliae that is endemic to north western Australia.
Acacia argutifolia, commonly known as the East Barrens wattle, is a shrub belonging to the genus Acacia and the subgenus Phyllodineae.
Acacia heterochroa is a shrub belonging to the genus Acacia and the subgenus Phyllodineae that is endemic to south western Australia.
Acacia pachypoda is a shrub belonging to the genus Acacia and the subgenus Phyllodineae that is endemic to south western Australia.
Acacia phaeocalyx is a shrub belonging to the genus Acacia and the subgenus Phyllodineae that is endemic to south western Australia.
Acacia simulans is a shrub of the genus Acacia and the subgenus Phyllodineae that is endemic to south western Australia.
Acacia aulacophylla is a shrub of the genus Acacia and the subgenus Plurinerves that is endemic to western Australia.
Acacia donaldsonii is a shrub of the genus Acacia and the subgenus Plurinerves that is endemism in an area of south western Australia.
Acacia manipularis is a shrub of the genus Acacia and the subgenus Plurinerves that is endemic to north western Australia.
Acacia arafurica is a shrub belonging to the subgenus Phyllodineae of the genus Acacia in the family Fabaceae. It is endemic to the Northern Territory, Australia.
Acacia conspersa is a shrub or tree belonging to the genus Acacia and the subgenus Juliflorae that is native to northern Australia.
Acacia helicophylla is a shrub belonging to the genus Acacia and the subgenus Juliflorae that is native to northern Australia.