Thelymitra ×irregularis Nicholls

Victorian Naturalist 63: 126, figs A-C (1946) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: rare (r)

Flowering stem erect, nearly straight, 20–40 cm tall, 1–2.5 mm diam., pink or purplish. Leaf linear-lanceolate, attenuate, 10–20 cm long, 2–4 mm wide, rather thin, canaliculate, dark green. Inflorescence (1–)2–4(–8)-flowered. Sterile bracts 1 or 2. Perianth segments ovate-lanceolate, 7–10 mm long, bright rose-pink with darker spots. Column 6–7 mm long, pink with darker band on top; mid-lobe expanded into an irregular, semicircular yellow crest, flanked by rows of calli; lateral lobes directed upwards into flat golden-yellow penicillate processes. Anther with obtuse apex just protruding between lateral lobes of column. Flowers Sep.–Nov.

EGL, GipP, HNF, HSF, OtP, VVP. Also SA, NSW, Tas. Believed to be a natural hybrid between T. ixioides and either T. carnea or T. rubra, sporadically occurring where the parent-species grow intermingled. Flowers Oct.-Nov. Widespread but rare in heathland, woodland and open forest on well-drained sand or clay loams.

An apparently fertile hybrid between T. ixioides and T. carnea, which occurs sporadically wherever the parents grow together. Hybrids of similar morphology occur between T. ixioides and T. carnea.

Unspotted variants of T. ×irregularis are sometimes incorrectly identified as T. luteocilium.

Flowers expand freely on warm days.

Source: Weber, J.Z.; Entwisle, T.J. (1994). Thelymitra. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne.
Updated by: Daniel Ohlsen, 2017-05-30
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Asparagales
family Orchidaceae
genus Thelymitra
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Thelymitra ×irregularis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Thelymitra ×irregularis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present native
Gippsland Plain present native
Otway Plain present native
East Gippsland Lowlands present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native