Sida arsiniata R.M.Barker
Nuytsia 17:26-29, Figs 3-4a (2007)

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

Brief Description
Amanda Spooner, Monday 31 March 2008

Monoecious, small spreading shrub, to 0.5 m high. Red sand. Dunes.


Beard’s Provinces: Eremaean Province.

IBRA Regions: Carnarvon, Pilbara.

IBRA Subregions: Cape Range, Chichester, Fortescue, Hamersley, Roebourne.

Local Government Areas (LGAs): Ashburton, East Pilbara, Karratha.

Scientific Description
C. Hollister and K.R. Thiele, Wednesday 15 January 2020

Herb or shrub. Stems hairy. Leaves 12-70 mm long, 3-25 mm wide, not lobed; margins crenate; indumentum present, with stellate hairs; stipules present and persistent to older leaves or present but early deciduous (only visible on youngest leaves), 8-10 mm long. Perianth clearly of two whorls (calyx and corolla), the corolla obvious and prominent. Pedicel present, 7-15 mm long; indumentum present, with stellate hairs. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) absent. Calyx green, 6-13 mm long, the lobes fused half or more of their length, stellate hairs present. Corolla yellow, 5-7 mm long, glabrous. Stamens many, united and arising from a staminal tube around the style; filaments present, 1-2.2 mm long; anthers 0.3-1 mm long. Ovary hairs and scales absent (ovary quite glabrous); style 1, 2.8-4 mm long, with four or numerous style branches or lobes, mostly glabrous. Fruits indehiscent and splitting into sections (schizocarps), length-width ratio more or less as long as wide, mericarps wrinkled, hairs and scales absent; apex distinctly flat-topped; calyx persistent to mature fruit, not accrescent; carpels 12; seeds per loculus 1. Flowering time May, July, August or September. Distribution Botanical Province Eremaean, IBRA Bioregion Pilbara.