Picnomon acarna (L.) Cass.

Dict. Sci. Nat. 40: 188 (1826) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Annual, 50–100 cm high; stems much-branched, spiny-winged, cobwebbed. Leaves shallowly lobed with long yellow spines, densely cobwebbed; basal leaves oblanceolate, to 30 cm long and 3 cm wide; cauline leaves linear, mostly 4–10 cm long, 4–8 mm wide, apex spine-tipped, base decurrent. Capitula sessile, solitary or in groups of 2–4, cylindrical but tapering distally, c. 1 cm diam.; involucre 2–3 cm long; intermediate bracts linear-lanceolate, terminal spine recurved, yellow, to c. 7 mm long, spinules 1–4 pairs; inner bracts longer and narrower with less-prominent spines. Florets bisexual; corolla 20–25 mm long, pink or purple. Cypselas 4–6 mm long, brown to black with paler streaks, smooth; pappus 1–2 cm long.

*DunT, *Gold, *LoM, *MuM, *MSB, *VVP, *Wim. Also naturalised SA. Native to northern Africa, temperate Asia, and Europe. Apparently confined to drier inland parts of western Victoria where found mainly in pasture and on roadsides. Declared a noxious weed in Victoria, but eradication programmes have so far kept it under control in this State.

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 (as Cirsium acarna (L.) Moench).
Updated by: Val Stajsic, 2018-01-24
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Asteranae
order Asterales
family Asteraceae
genus Picnomon
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Picnomon acarna in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Picnomon acarna in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present naturalised
Murray Mallee present naturalised
Wimmera present naturalised
Victorian Volcanic Plain present introduced
Murray Scroll Belt present naturalised
Goldfields present naturalised
Dundas Tablelands present introduced

State distribution

Distribution map
South Australia