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Thomasia sp. Big Brook (M. Koch 2373)

Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status

Bushy shrub, 0.5-2(-3) m high. Fl. pink-purple, Oct to Nov. Peaty sandy or sandy gravelly soils. Along watercourses, swamps.

Amanda Spooner, Descriptive Catalogue, 7 October 1997

Scientific Description

Shrub, with hairy stems. Leaves 30-95 mm long, 12-60 mm wide, not lobed; margins sinuate; hairy, with stellate hairswith scales absent, Sessile glands absent; stipules present but early deciduous (only visible on youngest leaves), 8-20 mm long. Perianth of two whorls but the corolla reduced to small scales or tiny lobes at the base of the ovary. Pedicel present, 3-4 mm long; indumentum present, with stellate hairs present, with scales absent. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) present, 2.7-4 mm long, the lobes free, indumentum present, stellate hairs presentwith scales absent, Sessile glands absent. Calyx pink or purple, 4-7.5 mm long, the lobes fused half or more of their length, Sessile glands absent, simple hairs (without tubercle bases) absent, stellate hairs present, tubercle-based simple hairs absent, gland-tipped hairs absent, scales absent, Terminal appendages absent, number of ribs present, one. Indumentum (outside) Sessile glands absent. Stamens five, free and inserted at the base of the ovary; filaments present, 1.2-1.5 mm long; anthers 2-3 mm long, indumentum absent (anthers glabrous). Staminodes absent, appendages absent. Ovary; style 1, with a lobed or capitate stigma, 2-2.5 mm long, with one style branches or lobes, mostly glabrous, wing absent. Flowering time October or November. Distribution Botanical Province South-West, IBRA Bioregion Jarrah Forest and Warren.

C. Hollister and K.R. Thiele, 11 August 2023


IBRA Regions
Jarrah Forest, Warren.
IBRA Subregions
Northern Jarrah Forest, Southern Jarrah Forest, Warren.
Local Government Areas (LGAs)
Albany, Augusta Margaret River, Collie, Dardanup, Harvey, Kojonup, Manjimup, Nannup, Plantagenet, Waroona.