Prostanthera arapilensis

Erect shrub 0.5–1.5 m high, aromatic; branches with moderately dense to dense spreading or retrorse coarse hairs, sparsely glandular, with regular decussate spines 6–15 mm long. Leaves broadly ovate to broadly obovate or orbicular, lamina (1.5–)3–4.5(–6) mm long, 1–2(–5) mm wide, light to dark green, paler below, surfaces moderately to densely hispid, copiously covered with subsessile glands below, base acute to subobtuse, margin entire, sometimes slightly recurved, apex obtuse; petiole 0.2–1 mm long. Flowers appearing axillary; bracteoles persistent, 1.5–2 mm long, 0.2–0.3 mm wide. Calyx 5.5–7 mm long, tube 3–4 mm long, adaxial lobe 1.5–3 mm long (not enlarged in fruit); corolla pale mauve or white, orange-brown dotted or streaked in throat on lower lip, 12–19 mm long; anther appendage c. 1–2 mm long.