Prostanthera walteri F.Muell.

Blotchy Mintbush

Spreading, tangled shrub 1-2 m tall. Leaves ovate to rhombic, 1-3 cm long, 0.5-1.5 cm wide, blunt, entire, margins bent under, upper surface grooved; stalk 2-5 mm long. Flowers solitary in the leaf axils. Calyx striated, tube 4-5 mm long. Corolla 1.5-2.5 cm long, blue-green or sometimes greenish yellow, purple-veined; summer.

NSW, Vic

Source: Lumley, P. (2002). Origanum. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.

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Distribution map
kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Asteranae
order      Lamiales
family       Lamiaceae
genus        Prostanthera Labill.