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Thomasia tremandroides Paust

Nuytsia 1:348, Fig. 1 (1974)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status

Erect or low spreading shrub, 0.1-0.6 m high. Fl. blue-purple-pink, Aug to Nov. Yellow sand, often over laterite. Sandplains.

Grazyna Paczkowska, Descriptive Catalogue, 2 October 1996

Scientific Description

Shrub, with hairy stems. Leaves 5-10 mm long, 3-7 mm wide, not lobed; margins entire or crenate; hairy, with stellate hairswith scales absent, Sessile glands absent; stipules present but early deciduous (only visible on youngest leaves), 2-5 mm long. Perianth of two whorls but the corolla reduced to small scales or tiny lobes at the base of the ovary. Pedicel present, 4-6 mm long; indumentum present, with stellate hairs present, with gland tipped hairs present, with scales absent. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) present, 3.5-6 mm long, the lobes free, indumentum present, stellate hairs presentwith scales absent, Sessile glands absent. Calyx pink, blue or purple, 5.5-9 mm long, the lobes fused less than half 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. Corolla 0.9-2.1 mm long, glabrous. Indumentum (outside) Sessile glands absent. Stamens five, free and inserted at the base of the ovary; filaments present, 0.2-0.5 mm long; anthers 2.8-3.2 mm long, indumentum absent (anthers glabrous). Staminodes absent, appendages absent. Ovary hairs or scales present, simple hairs absent, stellate hairs present, gland-tipped hairs absent; style 1, with a lobed or capitate stigma, 2.4-3.2 mm long, with one style branches or lobes, mostly glabrous, wing absent. Flowering time October or November. Distribution Botanical Province South-West, IBRA Bioregion Warren.

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


IBRA Regions
Avon Wheatbelt, Geraldton Sandplains, Murchison.
IBRA Subregions
Geraldton Hills, Katanning, Lesueur Sandplain, Merredin, Western Murchison.
Local Government Areas (LGAs)
Carnamah, Dalwallinu, Moora, Morawa, Mount Marshall, Mukinbudin, Murchison, Northampton, Perenjori, Wongan-Ballidu.