Securidaca longepedunculata has pale grey bark on its erect, usually slender stems (SA Tree List No. 303).

The leaves are simple and spirally arranged or clustered on dwarf spur-branchlets. They are variably shaped, ranging from narrowly elliptic to broadly oblong. The apex is rounded, the base narrowly tapering and the margin entire. Young leaves are hairy, mature ones not.

The flowers are small and pink, lilac or purple in colour. They grow in abundant axillary and terminal sprays in late winter and early spring. The stalks are long and slim, the feature referred to in the specific epithet. Of the five sepals, the two lateral ones are like winged petals. There are three petals, the central one being hooked. The eight stamens are joined, forming a tube-like structure.

The fruit is a spherical nut fitted with an oblong, curved wing of 4 cm. The hatchet-like shape of this membranous structure is referred to in the generic name of Securidaca (Coates Palgrave, 2002).