Acacia rigens, commonly known as nealie, is an erect or spreading shrub or small tree that is endemic to Australia.[2][3] Other common names include needle wattle, needlebush acacia, nealia and nilyah.[3]
| Acacia rigens | |
|---|---|
| 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. rigens |
| Binomial name | |
| Acacia rigens A.Cunn. ex G.Don[1] | |
| Occurrence data from AVH | |
| Synonyms | |
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Plants typically grows to a height of 1 to 6 m (3 ft 3 in to 19 ft 8 in) and have rigid, terete phyllodes that are between 3 to 13 cm (1.2 to 5.1 in) in length. The bright yellow flowerheads appear in groups of up to four in the axils of the phyllodes. The simple inflorescences have resinous and spherical flower-heads with a diameter of 4 to 7 mm (0.16 to 0.28 in) and contain 20 to 30 bright yellow coloured, 5-merous flowers that appear between July and December in the species' native range, followed by curled, twisted or coiled seed pods which are 4 to 10 cm (1.6 to 3.9 in) long and 2 to 3 mm (0.079 to 0.118 in) wide.[2][3]
The species was first formally described in 1832 by botanist Allan Cunningham.[1] It resembles Acacia havilandiorum but has longer phyllodes and 4-merous flowers. The specific epithet is thought to be a reference to the rigidity of the phyllodes.[3]
The species occurs on red earth, sandy or shaly soils in mallee and woodland in southern Western Australia, South Australia, Victoria, New South Wales and Queensland.[3][4]
The species is fast-growing and is both frost and drought tolerant, rarely requiring watering after establishment. It is adaptable to most soils and is best suited to a position in full sun or light shade.[5]
The larvae of the double-spotted lineblue butterfly feed on this species.[4]
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