Acacia pendula

Acacia pendula, commonly known as the weeping myall, true myall, myall, silver-leaf boree, boree, and nilyah, is a species of wattle, which is native to Australia. The 1889 book The Useful Native Plants of Australia records that common names included "Weeping Myall", "True Myall", and Indigenous people of western areas of New South Wales and Queensland referred to the plant as "Boree" and "Balaar".

Description
The tree typically grows to a height of 5 to 13 m and a width of 4 to 6 m and has an erect, pendulous to spreading habit. It has hard fissured grey bark on the trunk and limbs. It has pendulous branches with angled or flattened branchlets that are covered in short fine hairs but becomes glabrous as it matures. The grey-green narrow phyllodes are about 4 to 14 cm in length and 3 to 10 mm wide and have a narrowly elliptic to very narrowly elliptic or sometimes narrowly oblong-elliptic shape and can be straight or curved The phyllodes have many longitudinal indistinct veins, a subacute apex with mucro and one gland near base. It flowers in the summer and autumn from around November to May and produces yellow flowers. The inflorescences mostly occur in groups of two to five on an axillary axis. The spherical flower heads have a diameter of 3 to 7 mm and contain 10 to 20 bright yellow flowers. The papery to leathery green seed pods that form after flowering are flat and straight to strongly curved and age to a brown colour. The pods are irregularly constricted between each seed and are 3 to 9 cm in length and 10 to 20 mm. Seeds are often collected between October and January.

Taxonomy
The species was formally described by the botanist George Don in 1832 as part of the work A General History of Dichlamydeous Plants. It was reclassified as Racosperma pendulum by Leslie Pedley in 1987 then transferred back to genus Acacia in 2014. The specific epithet is in reference to the pendulous habit of the tree. It is derived from the Latin word pendere meaning 'to hang down'.

Distribution
It occurs naturally in dry outback areas in Queensland, New South Wales, and Victoria. In New South Wales the tree has a disjunct but widespread distribution throughout inland areas, usually to the west of the upper Hunter Valley. It is often situated on major river floodplains growing as part of woodlands, sometimes as the dominant species, where it grows well in heavy clay soils. In all states it is found to the west of the Great Dividing Range growing in alluvial soils consisting of sand, gravel, silt and clay in areas that receive 400 to 600 mm of annual rainfall.

Uses and cultivation
In The Useful Native Plants of Australia it was noted that "Stock are very fond of the leaves of this tree, especially in seasons of drought, and for this reason, and because they eat down the seedlings, it has almost become exterminated in parts of the colonies."

The tree is available commercially as seedlings or in seed form and has many desirable properties in areas of low rainfall since it is drought tolerant. It is also frost tolerant and will grow in heavy clay soils. It is useful as a shelter-tree or as a windbreak and attracts native birds, particularly parrots who use the seeds as a food source. The rhizobium nodules in the roots also assist in fixing nitrogen into the soil. The blue-grey foliage and weeping habit make it popular both domestically and in overseas cultivation, including in Iran and Kuwait.