Centaurea solstitialis L.

St Barnaby's Thistle

Sp. Pl. 917 (1753) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Erect annual or biennial, to 1 m high. Basal leaves short-lived, petiolate, lanceolate, to 20 cm long and 6 cm wide, pinnatifid, lyrate, pubescent to cobwebbed, margins scabrous, petiolate; cauline leaves with decurrent bases, linear-lanceolate, 1–7 cm long, 2–8 mm wide, entire or toothed. Capitula solitary, ovoid to globose, 4–15 mm diam.; involucre 10–12 mm long; intermediate bracts ovate, cobwebbed to glabrous, terminal appendage with a straight spine 10–25 mm long and 1 or 2 pairs of smaller basal spines; inner bracts with a scarious, suborbicular, crenulate apex. Corolla 15–20 mm long, yellow. Cypselas c. 2.5 mm long, pale, streaked black, glabrous; pappus of unequal bristles to c. 4 mm long. Flowers mainly Nov.–Feb

*DunT, *EGU, *Gold, *MonT, *MuF, *NIS, *VRiv, *VVP, *Wim. Also naturalised WA, NT, SA, Qld, NSW, Tas. Native to Europe and western Asia. A declared noxious weed in Victoria, occurring on roadsides and degraded pasture, mostly between Hamilton and Myrtleford.

Source: Jeanes, J.A. (1999). Asteraceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 4, Cornaceae to Asteraceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2019-07-23
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Asteranae
order Asterales
family Asteraceae
genus Centaurea
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Centaurea solstitialis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Centaurea solstitialis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present naturalised
Victorian Volcanic Plain present naturalised
Victorian Riverina present naturalised
Murray Fans present naturalised
Goldfields present naturalised
Dundas Tablelands present introduced
Northern Inland Slopes present naturalised
East Gippsland Uplands present naturalised
Monaro Tablelands present naturalised

State distribution

Distribution map
Western Australia
Northern Territory
South Australia
New South Wales
Australian Capital Territory