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Radyera farragei (F.Muell.) Fryxell & S.H.Hashmi
Knobby Hibiscus

Bot.Gaz. 132:62 (1971)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status

Erect, spreading shrub, 1-3.5 m high. Fl. purple-blue, Jan to Dec. Often on red sandy or loamy soils, granitic stony soils.

Grazyna Paczkowska, Descriptive Catalogue, 24 September 1996

Scientific Description

Shrub, with hairy stems. Leaves 35-150 mm long, 28-105 mm wide, not lobed; margins sinuate; hairy, with stellate hairswith scales absent, Sessile glands absent; stipules present and persistent to older leaves. Perianth clearly of two whorls (calyx and corolla), the corolla obvious and prominent. Pedicel present, 6.5-7 mm long; indumentum present, with stellate hairs present, with scales absent. Epicalyx (extra segments or 'bracteoles' immediately below the calyx) present, 6-10 mm long, the lobes free, indumentum present, stellate hairs presentwith scales absent, Sessile glands absent. Calyx green, 12-20 mm long, the lobes fused less than half 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 blue or purple, 40-50 mm long, hairs or scales present or glabrous, simple hairs (without tubercle bases) present, stellate hairs present, tubercle-based simple hairs absent, gland-tipped hairs absent, scales absent. Indumentum (outside) Sessile glands absent. Stamens five or many, united and arising from a staminal tube around the style; filaments present, 0.7-2.5 mm long; anthers 1-1.5 mm long, indumentum absent (anthers glabrous). Staminodes absent, appendages absent. Ovary hairs and scales absent (ovary quite glabrous); style 1, with a lobed or capitate stigma, 20-23 mm long, with one style branches or lobes, mostly glabrous, wing absent. Flowering time January, February, March, April, May, June, July, August, September, October, November or December. Distribution Botanical Province Eremaean or South-West, IBRA Bioregion Gascoyne, Central Ranges, Yalgoo, Murchison, Coolgardie, Nullarbor, Hamton, Geraldton Sandplains, Avon Wheatbelt and Mallee.

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


IBRA Regions
Avon Wheatbelt, Central Ranges, Coolgardie, Gascoyne, Geraldton Sandplains, Hampton, Mallee, Murchison, Nullarbor, Yalgoo.
IBRA Subregions
Augustus, Eastern Goldfield, Eastern Murchison, Geraldton Hills, Hampton, Katanning, Mann-Musgrave Block, Mardabilla, Merredin, Nullarbor Plain, Southern Cross, Tallering, Western Mallee.
IMCRA Regions
Central West Coast.
Local Government Areas (LGAs)
Coolgardie, Dalwallinu, Dowerin, Dundas, Esperance, Greater Geraldton, Kalgoorlie-Boulder, Kondinin, Menzies, Merredin, Morawa, Murchison, Ngaanyatjarraku, Sandstone, Three Springs, Upper Gascoyne, Westonia, Wongan-Ballidu, Yalgoo, Yilgarn.