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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.

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Hydrilla verticillata (L.f.) Royle
Water Thyme

Reference
Ill.Bot.Himal.Mts. 376 (1839)
Conservation Code
Not threatened
Naturalised Status
Mixed (Native in Part of Range, Naturalised Elsewhere)
Name Status
Current

Submerged, attached, much branched, aquatic perennial, herb, leaves in whorls, flowers emergent, male flower is a detached, air filled bud; air pollination. Fl. green & other, Apr to Jul. Sand. In stagnant or slow-flowing freshwater.

Grazyna Paczkowska, Descriptive Catalogue, 13 July 1994

Distribution

IBRA Regions
Central Kimberley, Dampierland, Ord Victoria Plain, Swan Coastal Plain, Victoria Bonaparte.
IBRA Subregions
Hart, Keep, Perth, Pindanland, Purnululu.
IMCRA Regions
Leeuwin-Naturaliste.
Local Government Areas (LGAs)
Broome, Canning, Cockburn, Halls Creek, Swan, Vincent, Wyndham-East Kimberley.