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Diuris aequalis F.Muell. ex Fitzg.
Family Orchidaceae
Common name: Buttercup Doubletail

Diuris aequalis F.Muell. ex Fitzg. APNI*

Synonyms: Diuris maculata var. concolor Benth. APNI*

Description: Terrestrial herb.

Leaves 2, linear, 10–20 cm long, 3–4 mm wide, conduplicate.

Raceme 20–45 cm high, 2–5-flowered. Flowers golden yellow to orange, usually unspotted, c. 2.5 c. across. Dorsal sepal broad-ovate to circular, 7–10 mm long, 8–15 mm wide, erect. Lateral sepals linear to oblanceolate, 8–13 mm long, 2–3 mm wide, falcate, green. Petals erect, widely divergent; lamina elliptic to circular, 6–10 mm long, 4–6 mm wide; claw 4–6 mm long, green. Labellum 5–6 mm long; lateral lobes narrowly to broadly cuneate, 5–9 mm long, 2.5–5 mm wide; midlobe broad-cuneate when flattened, c. 7 mm wide, ridged along midline; callus of 2 broad, incurved ridges c. 3.5 mm long.

Photo J. Plaza

Flowering: October–December

Distribution and occurrence: Grows among grass in sclerophyll forest, mainly in the ranges and tablelands; chiefly from Braidwood to Kanangra and Liverpool.
NSW subdivisions: CC, CT, ST

Threatened species: NSW BCA: Endangered; Commonwealth EPBC: Vulnerable
AVH map***

Text by D. L. Jones
Taxon concept: Flora of NSW 4 (1993)

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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