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Service Notice

The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s flora taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not currently being reflected in Florabase, herbarium collections, or the census. Due to the rapidly approaching holiday season and associated agency and facility soft closures, along with the substantial work involved in data mapping, cleaning, and verification, the migration to the new collection management software is not expected to occur before 1 March 2026, when a further update will be provided. Please reach out to us if you have any questions or concerns.

The notice period started at 9:45 am on Friday, 12 December 2025 +08:00 and will end at 12:00 pm on Monday, 2 March 2026 +08:00.

Thomasia dielsii E.Pritz.

Reference
Bot.Jahrb.Syst. 35:376 (1904)
Conservation Code
Priority One
Naturalised Status
Native to Western Australia
Name Status
Current

Erect spreading shrub, to 0.4 m high. Fl. blue-purple, Nov to Dec. Sandy or gravelly loam. Flats.

Grazyna Paczkowska, Descriptive Catalogue, 2 October 1996

Scientific Description

Shrub, with hairy stems. Leaves 17-25 mm long, 6-7 mm wide, not lobed; margins entire; hairy, with stellate hairswith scales absent, Sessile glands absent; stipules present but early deciduous (only visible on youngest leaves). Perianth of two whorls but the corolla reduced to small scales or tiny lobes at the base of the ovary (by misinterpretation). Pedicel present, 4-5 mm long; indumentum present, with stellate 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 or purple, 9-9.5 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 glabrous. Indumentum (outside) Sessile glands absent. Stamens five, free and inserted at the base of the ovary; filaments present, 1.3 mm long; anthers 2.5 mm long, indumentum absent (anthers glabrous). Staminodes absent, appendages absent. Ovary hairs and scales absent (ovary quite glabrous); style 1, with a lobed or capitate stigma, 3.7 mm long, with one style branches or lobes, mostly glabrous, wing absent. Flowering time November or December. Distribution Botanical Province South-West, IBRA Bioregion Avon Wheatbelt and Esperance. Conservation Code Priority One (P1).

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

Distribution

IBRA Regions
Avon Wheatbelt, Esperance Plains, Jarrah Forest.
IBRA Subregions
Fitzgerald, Katanning, Northern Jarrah Forest, Southern Jarrah Forest.
Local Government Areas (LGAs)
Cranbrook, Donnybrook-Balingup, Manjimup, West Arthur, Williams.