Sida petrophila F.Muell.
Linnaea 25:381-382 (1853)

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

Brief Description
Amanda Spooner, Thursday 6 November 1997

Low shrub. Fl. yellow. Rocky places.

Distribution

Beard’s Provinces: Eremaean Province, South-West Province.

IBRA Regions: Avon Wheatbelt, Coolgardie, Esperance Plains, Murchison, Yalgoo.

IBRA Subregions: Avon Wheatbelt P1, Eastern Goldfield, Eastern Murchison, Fitzgerald, Mardabilla, Southern Cross, Tallering.

Local Government Areas (LGAs): Esperance, Laverton, Menzies, Morawa, Ravensthorpe, Yilgarn.

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

Herb or shrub. Stems hairy. Leaves 12-40 mm long, 5-15 mm wide, not lobed; margins crenate or serrate; indumentum present, with stellate hairs; stipules present and persistent to older leaves, 7-15 mm long. Perianth clearly of two whorls (calyx and corolla), the corolla obvious and prominent. Pedicel present, 3.2-9 mm long; indumentum present, with stellate hairs. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) absent. Calyx green, 6.5-10 mm long, the lobes fused less than half their length, stellate hairs present. Corolla yellow, 6-10 mm long, hairs or scales present, stellate hairs present. Stamens many, united and arising from a staminal tube around the style; filaments present, 1-1.5 mm long; anthers 0.4-0.6 mm long. Ovary hairs and scales absent (ovary quite glabrous); style 1, 5.5-6.2 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 or scales present, stellate hairs present; apex distinctly flat-topped; prickles absent (except perhaps a terminal awn); terminal awns or spines present; calyx persistent to mature fruit, not accrescent. Flowering time August or September. Distribution Botanical Province Eremaean or South-West, IBRA Bioregion Yalgoo, Murchison, Coolgardie, Avon Wheatbelt or Esperance.