Eremophila lachnocalyx is an erect shrub with many tangled branches growing to a height of 0.6–1.5 m (2–5 ft).
Its branches and leaves are densely covered with mostly branched, woolly hairs giving them a greyish appearance.
The leaves are clustered, often in dense spirals around the branches and are elliptic to egg-shaped, 3.5–10 mm (0.1–0.4 in) long, 2.5–4 mm (0.1–0.2 in) wide, and sometimes covered in resin so that they appear to be glabrous.


The flowers are borne singly in leaf axils on a straight, hairy stalk, 8.5–16 mm (0.3–0.6 in) long.
There are 5 linear to tapering triangular sepals which are mostly 9–12.5 mm (0.4–0.5 in) long with their outer surface densely covered with a thick layer of woolly hairs.
The petals are 13–25 mm (0.5–1 in) long and are joined at their lower end to form a tube.
The petal tube is lilac-coloured to deep violet on the outside and white inside.
The outside of the petal tube is mostly covered with hairs but the inside surface of the lobes is glabrous while the inside of the tube is woolly.
The 4 stamens are fully enclosed in the petal tube.
Flowering occurs from June to September and is followed by oval-shaped fruits which have a crusty, woolly covering and are 6–7 mm (0.2–0.3 in) long.
Eremophila lachnocalyx is an erect shrub with many tangled branches growing to a height of 0.6–1.5 m (2–5 ft). Its branches and leaves are densely covered with mostly branched, woolly hairs giving them a greyish appearance. The leaves are clustered, often in dense spirals around the branches and are elliptic to egg-shaped, 3.5–10 mm (0.1–0.4 in) long, 2.5–4 mm (0.1–0.2 in) wide, and sometimes covered in resin so that they appear to be glabrous.

The flowers are borne singly in leaf axils on a straight, hairy stalk, 8.5–16 mm (0.3–0.6 in) long. There are 5 linear to tapering triangular sepals which are mostly 9–12.5 mm (0.4–0.5 in) long with their outer surface densely covered with a thick layer of woolly hairs. The petals are 13–25 mm (0.5–1 in) long and are joined at their lower end to form a tube. The petal tube is lilac-coloured to deep violet on the outside and white inside. The outside of the petal tube is mostly covered with hairs but the inside surface of the lobes is glabrous while the inside of the tube is woolly. The 4 stamens are fully enclosed in the petal tube. Flowering occurs from June to September and is followed by oval-shaped fruits which have a crusty, woolly covering and are 6–7 mm (0.2–0.3 in) long.
Eremophila lachnocalyx