About Erythrina vespertilio Benth.
Erythrina vespertilio Benth. is typically a small, straggly tree that grows to a height of 6 to 10 metres (20 to 33 ft). Its trunk reaches an approximate diameter of 0.3 m (1.0 ft), and bears thorns along with deeply furrowed, corky, creamy-grey bark; thorns also grow on the tree’s branches. This species is deciduous, losing all its leaves during the dry season. Its leaves are either bifoliolate or trifoliolate, and measure 10 to 15 centimetres (4 to 6 in) in total length. The leaflets are broad and wedge-shaped with three lobes, a form that resembles a bat’s open wings. Individual leaflets are 7 to 12 cm (2.8 to 4.7 in) long and 5 to 12 cm (2.0 to 4.7 in) wide. Flowering occurs between August and September, usually when the tree is leafless. The blooms are scarlet to orange-red pea-shaped flowers 3 to 4 cm (1.2 to 1.6 in) long, borne on terminal racemes that are 5 to 25 cm (2.0 to 9.8 in) in length. Each flower has a calyx 1.5 to 2.5 cm (0.59 to 0.98 in) long, petals roughly 3 cm (1.18 in) long, and usually ten stamens. After flowering, the tree produces elongated pods 6 to 12 cm (2.4 to 4.7 in) long and 1.5 to 1.8 cm (0.59 to 0.71 in) wide, which contain bean-like seeds around 1.2 cm (0.47 in) long that range in colour from orange to dark yellow. This species is distributed across all mainland Australian states except Victoria. It grows mainly in open woodlands, and can also extend into arid areas and rainforest margins. In Australia, it occurs in the Kimberley, Pilbara and northern Goldfields-Esperance regions of Western Australia, across most of the Northern Territory and Queensland, in northern South Australia, and in north eastern New South Wales. It grows at altitudes from near sea level up to 800 metres (2,625 ft). It tolerates a wide range of soil types, provided the soil has good drainage and the tree receives full sun. Aboriginal Australian communities in Central Australia have traditionally used this species widely. The Warlpiri, Anmatyerr, Arrernte and Alyawarr peoples use its wood to make shields for both warfare and ceremonial use, and these shields can also be used for friction fire starting. The wood is also used to make woomeras and coolamons. The bark is recognized to have traditional medicinal properties. The fruit of this tree contains alkaloids, and the stem contains isoflavonoids. At high doses, the flavonoid phaseollidin from this species has shown cytotoxic activity in vitro against prostate cancer cell lines. The seeds are used to make decorations.
