Sida hookeriana Miq.
Lehm., Pl.Preiss. 1:242 (1845)

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

Brief Description
Grazyna Paczkowska, Tuesday 24 September 1996

Slender, erect annual, herb, 0.15-0.8 m high. Fl. white, Sep to Dec. Sandy or loamy soils. Granite outcrops, gullies.


Beard’s Provinces: South-West Province.

IBRA Regions: Esperance Plains, Geraldton Sandplains, Jarrah Forest, Swan Coastal Plain, Warren.

IBRA Subregions: Fitzgerald, Lesueur Sandplain, Northern Jarrah Forest, Perth, Recherche, Southern Jarrah Forest, Warren.

IMCRA Regions: WA South Coast.

Local Government Areas (LGAs): Albany, Augusta Margaret River, Bridgetown-Greenbushes, Dandaragan, Esperance, Gosnells, Harvey, Irwin, Kalamunda, Manjimup, Mundaring, Nannup, Plantagenet, Serpentine-Jarrahdale.

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

Herb or shrub. Stems glabrous. Leaves 35-95 mm long, 15-60 mm wide, palmately lobed, simply (once-)lobed or complexly (twice-)lobed; margins serrate; indumentum present, with stellate hairs, with tubercle-based simple hairs; stipules present and persistent to older leaves, 15-25 mm long. Perianth clearly of two whorls (calyx and corolla), the corolla obvious and prominent. Pedicel present, 11-16 mm long; indumentum present, with simple hairs, with stellate hairs. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) absent. Calyx green, 5-9 mm long, the lobes fused less than half their length, simple hairs (without tubercle bases) present, stellate hairs present. Corolla yellow or white, 6-9 mm long, glabrous. Stamens many, united and arising from a staminal tube around the style; filaments present, 0.2-0.3 mm long; anthers 0.2-0.3 mm long, indumentum absent (anthers glabrous). Ovary hairs and scales absent (ovary quite glabrous); style 1, 3.8-4 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 rounded; calyx persistent to mature fruit, accrescent. Flowering time September, October, November or December. Distribution Botanical Province South-West, IBRA Bioregion Geraldton Sandplains, Swan Coastal Plain, Jarrah Forest, Warren or Esperance.