Sida rohlenae Domin subsp. rohlenae

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

Brief Description
Amanda Spooner, Friday 10 September 1999

Erect shrub, 0.3-1 m high, mericarps with long barbed awns, stems with or without longer simple hairs. Fl. yellow-orange, Apr to Oct. Red sandy soils, clay. Sandhills and ridges, floodplains.

Distribution

Beard’s Provinces: Eremaean Province, Northern Province.

IBRA Regions: Carnarvon, Central Kimberley, Central Ranges, Dampierland, Gascoyne, Great Sandy Desert, Northern Kimberley, Ord Victoria Plain, Pilbara, Tanami, Victoria Bonaparte.

IBRA Subregions: Ashburton, Cape Range, Chichester, Hamersley, Hart, Mackay, Mann-Musgrave Block, Mitchell, Ord, Ord-Victoria Plains P1, Pentecost, Pindanland, Roebourne, Tanami P1, Victoria Bonaparte P1, Wooramel.

IMCRA Regions: Ningaloo, Shark Bay.

Local Government Areas (LGAs): Ashburton, Carnarvon, Derby-West Kimberley, East Pilbara, Exmouth, Halls Creek, Karratha, Ngaanyatjarraku, Port Hedland, Upper Gascoyne, Wyndham-East Kimberley.

Scientific Description
Chris Hollister and Kevin Thiele, Wednesday 21 August 2019

Herb or shrub. Stems hairy. Leaves 45-55 mm long, 8-10 mm wide, not lobed; margins serrate; indumentum present, with stellate hairs; stipules present and persistent to older leaves. Perianth clearly of two whorls (calyx and corolla), the corolla obvious and prominent. Pedicel present, 5 mm long; indumentum present, with stellate hairs. Calyx green, 8 mm long, the lobes fused half or more of their length, stellate hairs present. Corolla yellow or orange, 10 mm long, glabrous. Stamens many, united and arising from a staminal tube around the style; filaments present, 0.6-1 mm long; anthers 0.6 mm long. Ovary hairs and scales absent (ovary quite glabrous); style 1, 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, scales absent; apex rounded; terminal awns or spines present; calyx persistent to mature fruit, not accrescent. Flowering time April, May, June, July, August, September or October. Distribution Botanical Province Northern or Eremaean, IBRA Bioregion Tanami, Pilbara, Carnarvon, Gascoyne, Central Ranges, North Kimberley, Victoria Bonaparte, Central Kimberley, Dampierland or Ord-Victorian-Plain.