Electronic Flora of South Australia
Electronic Flora of South Australia
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Electronic Flora of South Australia species Fact Sheet

Family: Orchidaceae
Diuris sulphurea

Citation: R. Br., Prod. Fl. Nov. Holl. 316 (1810).

Synonymy: Not Applicable

Common name: Tiger-orchid.

Small slender to rather stout plant 15-50 cm high; tubers obconical; leaves 2 or 3, linear-lanceolate, much exceeding the middle of the stem, 18-45 cm long, lax, channelled, never setaceous.

Flowers 1-6 (rarely more) in a loose raceme; yellow with a few brown markings; dorsal sepal c. 20 mm long, ovate, recurved, with a dark-brown spot on each side of the lower surface near the base; lateral sepals c. 22 mm long, usually parallel, spreading, linear, acuminate, green or green and brown; petals 20-21 mm long, on a brown stalk 4-5 mm long, spreading, lamina elliptical, yellow; labellum sessile, 3-lobed, shorter than the dorsal sepal, 12-15 mm long, trapezoid; lateral lobes about half as long as the central lobe, c. 5 mm long, rather wide and blunt, obovate, middle lobe wide, rhomboid-cuneate, depressed on either side of the central ridge; lamina with a transverse blotch near the apex and with a single conspicuous raised longitudinal ridge from the base to just beyond the middle, where it merges into the fold of the lobe; anther hardly pointed, its apex as high as the viscid disk of the rostellum: lateral appendages of the column prominent, semiovate, a little higher than the viscid disk, incurred.

Published illustration: Gray (1966) Victorian native orchids, p. 41; Woolcock (1984) Australian terrestrial orchids, pl. 32B.

Distribution:  Uncommon in damp sandy soils in open Eucalyptus baxteri forest and around swamp margins.

S.Aust.: SE.   Qld; N.S.W.; Vic.; Tas.

Conservation status: native

Flowering time: Aug. — Nov.

SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia

Biology: No text

Author: Not yet available

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