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Sida arsiniata R.M.Barker

Reference
Nuytsia 17:26-29, Figs 3-4a (2007)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Monoecious, small spreading shrub, to 0.5 m high. Red sand. Dunes.

Amanda Spooner, Descriptive Catalogue, 31 March 2008

Scientific Description

Herb or shrub, with hairy stems. Leaves 12-70 mm long, 3-25 mm wide, not lobed; margins crenate; hairy, with stellate hairswith scales absent, Sessile glands absent; stipules present and persistent to older leaves or present but early deciduous (only visible on youngest leaves), 8-10 mm long. Perianth clearly of two whorls (calyx and corolla), the corolla obvious and prominent. Pedicel present, 7-15 mm long; indumentum present, with stellate hairs present, with scales absent. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) absent. Calyx green, 6-13 mm long, the lobes fused half or more of their length, Sessile glands absent, simple hairs (without tubercle bases) absent, stellate hairs present, tubercle-based simple hairs absent, gland-tipped hairs absent, scales absent, Terminal appendages absent, number of ribs absent. Corolla yellow, 5-7 mm long, glabrous. Indumentum (outside) Sessile glands absent. Stamens many, united and arising from a staminal tube around the style; filaments present, 1-2.2 mm long; anthers 0.3-1 mm long, indumentum absent (anthers glabrous). Staminodes absent, appendages absent. Ovary hairs and scales absent (ovary quite glabrous); style 1, 2.8-4 mm long, with four or numerous style branches or lobes, mostly glabrous, wing absent. 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; prickles absent (except perhaps a terminal awn); terminal awns or spines absent; calyx persistent to mature fruit, not accrescent; carpels 12; seeds per loculus 1. Flowering time May, July, August or September. Distribution Botanical Province Eremaean, IBRA Bioregion Pilbara.

C. Hollister and K.R. Thiele, 11 August 2023

Distribution

IBRA Regions
Carnarvon, Pilbara.
IBRA Subregions
Cape Range, Chichester, Fortescue, Hamersley, Roebourne.
Local Government Areas (LGAs)
Ashburton, East Pilbara, Exmouth, Karratha.