Prostanthera Labill.
Subshrubs, shrubs or small trees, upper calyx lip with no protuberance Prostanthera
Leaves subtending the flowers or cymes much smaller than the lower leaves or reduced to deciduous bracts or absent
Leaves with margins variously toothed
Leaves hairy on both surfaces
Leaves with margins crenate
Lower lip of the calyx slightly longer and narrower than the upper. Corolla mauve to bluish, 6–8 mm long. Calyx 4–5 mm long. Leaves only slightly recurved, orbicular to ovate, 2–6 mm long. Branches and leaves sprinkled with short stiff hairs. Aromatic, divaricate shrub up to 2 m high, with slender branches. Nepean River district and lower Blue Mts Open forests and RF; gullies. Fl. spring Prostanthera violacea
Both lips of the calyx broad; the lower slightly exceeding the upper. Corolla 6–8 mm long, lilac. Leaves 3–20 mm long, with recurved margins, bullate-rugose. More densely hairy and more robust in all its parts than P. violacea with which some small-leaved forms of it may be confused. Erect, aromatic shrub to 2.5 m high. Nepean River and Blue Mts Open forests. Fl. spring P. incana incanaP. incana