Sida arenicola S.T.Reynolds & A.E.Holland
Austrobaileya 2:463-465,Fig.4 (1988)

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

Brief Description
Grazyna Paczkowska, Tuesday 24 September 1996

Upright, spindly shrub, 0.5-1.2(-2) m high. Fl. yellow, May to Oct. Sandy & clayey soils. Along drainage lines, plains, rises.


Beard’s Provinces: Eremaean Province, Northern Province.

IBRA Regions: Carnarvon, Dampierland, Gascoyne, Gibson Desert, Great Sandy Desert, Great Victoria Desert, Little Sandy Desert, Ord Victoria Plain, Pilbara.

IBRA Subregions: Augustus, Cape Range, Chichester, Fortescue, Hamersley, Lateritic Plain, Mackay, McLarty, Pindanland, Roebourne, Shield, South Kimberley Interzone, Trainor.

Local Government Areas (LGAs): Ashburton, Broome, Derby-West Kimberley, East Pilbara, Exmouth, Halls Creek, Karratha, Laverton, Meekatharra, Port Hedland, Upper Gascoyne, Wiluna.

Scientific Description
Chris Hollister and Kevin Thiele, Thursday 18 May 2017

Herb or shrub. Stems hairy. Leaves 10-30 mm long, 2-10 mm wide, not lobed; margins entire; indumentum present, with stellate hairs; stipules present and persistent to older leaves or present but early deciduous (only visible on youngest leaves). Perianth clearly of two whorls (calyx and corolla), the corolla obvious and prominent. Pedicel present, 8-15 mm long; indumentum present, with stellate hairs. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) absent. Calyx green, 7-10 mm long, the lobes fused less than half their length, stellate hairs present. Corolla yellow, 5 mm long, glabrous. Indumentum (outside) Sessile glands absent. Stamens many, united and arising from a staminal tube around the style; filaments present, 1-1.2 mm long; anthers 0.4-0.5 mm long. Ovary hairs and scales absent (ovary quite glabrous); style 1, 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, Sessile glands absent; apex distinctly flat-topped; calyx persistent to mature fruit, not accrescent. Flowering time May, June, July, August, September or October. Distribution Botanical Province Northern or Eremaean, IBRA Bioregion Great Sandy Desert, Pilbara, Gascoyne, Little Sandy Desert, Gibson Desert, Great Victorian Desert, Dampierland or Ord-Victorian-Plain.