Acacia helicophylla
Acacia helicophylla is a shrub belonging to the genus "Acacia" and the subgenus "Juliflorae" that is native to northern Australia. Description. The shrub typically grows to a maximum height of . It has red-brown to blackish coloured minni ritchi style bark peels in long slender strips. The densely haired branchlets are mostly terete with angular upper branchlets slightly and have wide irregular bands of resinous tissue. Like most species of "Acacia" it has phyllodes rather than true leaves. The light green phyllodes have a narrowly oblong to oblanceolate shape that is undulate or spirally twisted. The hairy phyllodes  have a length of and a width of and are narrower toward the base. They have six to eight longitudinal nerves with one prominent midnerve. It blooms between March and August producing golden flowers. The cylindrical flower-spikes occur singly or in pairs in the axils and have a length of . Following flowering thinly coriaceous seed pods form that have a narrowly oblong shape and can be constricted between the seeds. The pods are in length and wide with fine hairs. The seeds within are arranged longitudinally. The dark brown swollen seeds have an elliptic shape and a length of  with an orbicular areole. Taxonomy. The species was first formally described by the botanist Leslie Pedley in 1974 as part of the work "Contributions from the Queensland Herbarium". It was reclassified as "Racosperma helicophylla" in 2003 by Pedley then transferred back to genus "Acacia" in 2006. Distribution. It is endemic to the top end of the Northern Territory where it is found in a tropical climate in a small area in Nitmiluk National Park between Katherine Gorge and Gunlom Falls where it is usually situated on steep hillsides and on sandstone cliffs where it is found among rocks growing in  skeletal sandy soils.