Diuris basaltica D.L.Jones

New Taxa Austral. Orch. (Austral. Orchid Res.) 5: 75 (2006) APNI

Taxonomic status:Accepted

Occurrence status:Endemic

Establishment means:Native

Threat status:EPBC: endangered (EN); Victoria: endangered (e); listed in Flora and Fauna Guarantee Act 1988

Flowering plant slender, 6–15 cm tall, often in densely crowded tufts of up to 30 plants. Leaves mostly 3–7, linear, 3–10 cm long, in a loose, erect tussock. Flowers 1 or 2, drooping, not opening widely, bright golden yellow, orange-yellow or orange, with a few short dark striations on the labellum and base of the dorsal sepal; pedicel (excluding ovary) 1–2.5 cm long, very slender, partly enclosed within bract; dorsal sepal porrect in basal third then obliquely erect, ovate, 7–12 mm long; lateral sepals obliquely deflexed, usually parallel, linear-oblanceolate, 10–16 mm long, green; petals incurved, 6–10 mm long, claw green, lamina ovate to ovate-elliptic. Labellum obliquely deflexed, 10–15 mm long, 3-lobed; lateral lobes small, oblong-cuneate, outer margins toothed; mid-lobe flat or shallowly concave, c. 3 times as long as the lateral lobes, broadly ovate, narrowed at base, with 2 widely separated, pubescent, longitudinal ridges extending shortly beyond base, a single, less distinct ridge continuing nearly to apex. Column wings about same height as anther. Flowers Sep.–Oct.

OtP, VVP. Extremely rare on basalt plains grassland immediately to the west of Melbourne.

This critically endangered species has lost most of its habitat to agriculture and urbanisation.

Thought to hybridise with Diuris palustris, yielding the probably extinct named hybrid D. ×fastidiosa. See also notes under D. chryseopsis.

Created by: Jeff Jeanes, 2015-01-16
Updated by: Val Stajsic, 2018-02-16
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Asparagales
family Orchidaceae
genus Diuris
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Diuris basaltica in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Diuris basaltica in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present native
Gippsland Plain present cultivated
Otway Plain present native

State distribution

Distribution map