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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.

Sida spinosa L.
Spiny Sida

Reference
Sp.Pl. [Linnaeus] 2:683-684 (1753)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Slender, upright or spreading shrub, 0.2-1 m high. Fl. yellow, Feb to Sep. Clay, sandy clay. Floodplains.

Grazyna Paczkowska, Descriptive Catalogue, 25 September 1996

Scientific Description

Herb or shrub, with hairy stems. Leaves 20-75 mm long, 5-20 mm wide, not lobed; margins crenate or serrate; hairy, with stellate hairswith scales absent, Sessile glands absent; stipules present and persistent to older leaves, 10-17 mm long. Perianth clearly of two whorls (calyx and corolla), the corolla obvious and prominent. Pedicel present, 2-5 mm long; indumentum present, with stellate hairs present, with scales absent. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) absent. Calyx green, 5-8 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, ten. Corolla yellow, 7 mm long, glabrous. Stamens many. Flowering time February, March, April, May, June, July, August or September. Distribution Botanical Province Northern or Eremaean, IBRA Bioregion Pilbara, Carnarvon, North Kimberley, Victoria Bonaparte, Central Kimberley, Dampierland and Ord-Victorian-Plain.

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

Distribution

IBRA Regions
Carnarvon, Central Kimberley, Dampierland, Gascoyne, Northern Kimberley, Ord Victoria Plain, Pilbara, Victoria Bonaparte.
IBRA Subregions
Augustus, Cape Range, Chichester, Fitzroy Trough, Fortescue, Hamersley, Hart, Keep, Mitchell, Pindanland, Purnululu, Roebourne.
Local Government Areas (LGAs)
Ashburton, Broome, Carnarvon, Derby-West Kimberley, East Pilbara, Exmouth, Halls Creek, Karratha, Wyndham-East Kimberley.