Acacia oncinophylla

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Fabales

Familia: Fabaceae
Subfamilia: Caesalpinioideae
Tribus: Acacieae
Genus: Acacia
Species: Acacia oncinophylla
Subspecies: A. oncinophylla subsp. oncinophylla - A. oncinophylla subsp. patulifolia
Name

Acacia oncinophylla Lindl.
References

Sketch Veg. Swan R. : xv. 1839

Acacia oncinophylla, commonly known as hook-leaved acacia,[1] is a shrub belonging to the genus Acacia and the subgenus Juliflorae.

Description

The shrub typically grows to a height of 0.5 to 3 metres (2 to 10 ft)[2] and has minni ritchi style bark and flattened and angular ribbed branchlets that glabrous or sparsely hairy on ribs and are sometimes coated with a white powdery coating. Like most species of Acacia it has phyllodes rather than true leaves. Thee evergreen phyllodes have a linear or linear-oblanceolate shape and can be either straight or curved. The glabrous, flexible or semi-rigid phyllodes have a length of 4 to 13 cm (1.6 to 5.1 in) and a width of 1 to 6 mm (0.039 to 0.236 in) with an acute to acuminate apex and have three to seven raised nerves on each face.[1] It flowers from August to September producing yellow flowers.[2] The simple inflorescences are found in pairs in the axils and have cylindrical flower-spikes with a length of 11 to 25 mm (0.43 to 0.98 in) and a diameter of 5 to 6 mm (0.20 to 0.24 in) and are densley packed with 50 to 97 golden coloured flowers. After flowering golden to silver coloured velvety seed pods form that have a linear shape and are straight to very slightly curved. The pods have a length of up to 6 cm (2.4 in) and a width of 5 to 6 mm (0.20 to 0.24 in) with obliquely arranged seeds inside. The glossy black seeds have a broadly elliptic shape and a length of 3 to 3.5 mm (0.12 to 0.14 in) with an apical aril.[1]
Taxonomy

The species was first formally described by the botanist John Lindley in 1839.

There are two recognised subspecies:

Acacia oncinophylla subsp. oncinophylla
Acacia oncinophylla subsp. patulifolia

It is quite closely related to Acacia fauntleroyi which is found further the east.[1]
Distribution

It is native to Swan Coastal Plain and South West regions of Western Australia where it is commonly situated on hills andslopes growing in granitic or lateritic soils.[2] It is found from around Mogumber in the north and follow down the Darling Range to around Wagerup in the south often as a part of jarrah woodland communities.[1]
See also

List of Acacia species

References

"Acacia oncinophylla". World Wide Wattle. Western Australian Herbarium. Retrieved 7 December 2019.
"Acacia oncinophylla". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.