Sida echinocarpa F.Muell.
Fragm. 11:62-63 (1879)

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

Brief Description
Grazyna Paczkowska, Tuesday 24 September 1996

Shrub, 0.4-1.2(-2.5) m high. Fl. yellow, Jul to Oct. Red sand, stony loam. Ironstone hills, flats.


Beard’s Provinces: Eremaean Province.

IBRA Regions: Carnarvon, Gascoyne, Great Sandy Desert, Little Sandy Desert, Pilbara.

IBRA Subregions: Ashburton, Augustus, Cape Range, Chichester, Fortescue, Hamersley, Mackay, Roebourne, Rudall.

Local Government Areas (LGAs): Ashburton, East Pilbara, Exmouth, Karratha, Meekatharra, Port Hedland.

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

Herb or shrub. Stems hairy. Leaves 25-90 mm long, 8-825 mm wide, not lobed; margins crenate or serrate; 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, 13-15 mm long; indumentum present, with stellate hairs. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) absent. Calyx green, 7.5-9 mm long, the lobes fused less than half their length, stellate hairs present. Corolla yellow, 8.5-11 mm long, hairs or scales present, stellate hairs present. Stamens many, united and arising from a staminal tube around the style; filaments present, 1.5-2.6 mm long; anthers 0.4-0.5 mm long. Ovary hairs or scales present, stellate hairs present; style 1, 5-5.8 mm long, with four 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 rounded; calyx persistent to mature fruit, 10-12 mm long, accrescent; carpels 9; seeds per loculus 1. Flowering time July, August, September or October. Distribution Botanical Province Eremaean, IBRA Bioregion Great Sandy Desert, Pilbara, Carnarvon, Gascoyne or Little Sandy Desert.