Prostanthera ammophila

Prostanthera ammophila, commonly known as sand mintbush, is a species of flowering plant in the family Lamiaceae and is endemic to southern areas of South Australia. It is an erect to spreading shrub with egg-shaped to narrow elliptical leaves and white and purple to mauve flowers with yellow spots inside.

Description
Prostanthera ammophila is an erect to spreading shrub that typically grows to a height of 0.6–1.7 m with densely hairy, silvery-green stems. The leaves are egg-shaped to narrow elliptical, silvery green to light green, 7–13 mm long and 2.5–5.5 mm wide and sessile. The flowers are arranged singly in six to twelve upper leaf axils, each flower on a pedicel 1–2 mm long. The sepals are green with a mauve to purple tinge and form a tube 2.5–4 mm long with two broadly egg-shaped lobes, the lower lobe 2–3.5 mm long and 2.5–3.5 mm wide, the upper lobe 4–8 mm long and 4–7.5 mm wide. The petals are 13–15 mm long, white near the base and purple to mauve nearer the tip with yellow spots inside and fused to form a tube 7–9 mm long. The lower lip has three lobes, the centre lobe spatula-shaped, 3–7 mm long and 2.5–5 mm wide and the side lobes 2.5–6 mm long and 2–4 mm wide. The upper lip has two lobes 3–5.5 mm long and 4.5–8.5 mm wide.

Taxonomy
Prostanthera ammophila was first formally described in 1988 by Barry Conn in the journal Nuytsia from specimens collected near Yardea Station in 1969.

Etymology
The species epithet, ammophila, is derived from the Greek: ammos (sand), and philos (loving) to give the adjective: ammophilus,-a,-um, which describes the plant as "sand-loving or as "growing in sandy soil.

Distribution and habitat
This mintbush grows on sand dunes and on rocky hills in the Gawler Ranges and Eyre Peninsula in South Australia.