Sisyrinchium micranthum Cav.

Blue Pigroot

Diss. 6: 345, t. 191, fig. 2. (1788)

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised


Not to be confused with Sisyrinchium micranthum auct.. non Cav., which was misapplied to S. rosulatum.

Annual or perennial herb. Stem usually branched, jointed, flattened to winged, 10–60 cm high, 1–3 mm wide. Leaves 5–20 cm long, 2–5 mm wide. Inflorescence with primary bracts narrowly ovate, sub-equal, 1.5–5 cm long. Perianth 10–20 mm diam., white to cream-coloured with purple-brown or blue throat; lobes oblong, acute to acuminate, usually sparsely glandular-pilose externally; staminal filaments 2–3 mm long, almost completely united; anthers c. 1.5 mm long; ovary 1–2 mm diam., glabrous or glandular-pilose. Capsule (3–)4–6 mm diam., brown; seeds angular, c. 1 mm diam., dark brown. Flowers Oct.–Feb.(–Apr.).

*CVU, *DunT, *EGL, *EGU, *GipP, *Glep, *Gold, *GGr, *HNF, *HSF, *MuF, *NIS, *OtP, *OtR, *SnM, *Strz, *VRiv, *VVP, *WaP, *WPro, *Wim. Also naturalised WA, SA, Qld, NSW. Native to Mexico and South America.  A weed of gardens, roadsides and other disturbed areas.

Created by: Val Stajsic, 2018-01-08
Updated by: Val Stajsic, 2020-09-21
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Asparagales
family Iridaceae
genus Sisyrinchium
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Sisyrinchium micranthum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Sisyrinchium micranthum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present naturalised
Glenelg Plain present naturalised
Victorian Volcanic Plain present naturalised
Victorian Riverina present naturalised
Murray Fans present naturalised
Gippsland Plain present naturalised
Otway Plain present naturalised
Warrnambool Plain present naturalised
Goldfields present naturalised
Central Victorian Uplands present naturalised
Greater Grampians present naturalised
Dundas Tablelands present naturalised
Northern Inland Slopes present naturalised
East Gippsland Lowlands present naturalised
East Gippsland Uplands present naturalised
Wilsons Promontory present naturalised
Highlands-Southern Fall present naturalised
Highlands-Northern Fall present naturalised
Otway Ranges present naturalised
Strzelecki Ranges present naturalised
Snowy Mountains present naturalised