New Taxa Austral. Orch. (Austral. Orchid Res.) 5: 155 (2006) APNI
Threat status:Victoria: endangered (e); listed in Flora and Fauna Guarantee Act 1988
Flowering stem 20–40 cm tall. Leaf-blade to 30 cm long, 2–3 mm diam. at base, dark green, apex lax, often withered at flowering. Flowers 12–35, fragrant, greenish brown to brownish, sessile in a moderately dense to dense spike 8–15 cm long; ovary obovoid, 5–6 mm long, green; sepals 7–9 mm long, dorsal sepal ovate-lanceolate, deflexed, lateral sepals free, linear-lanceolate, widely divergent, recurved distally; petals 6–7 mm long, linear-lanceolate, porrect or spreading, blunt. Labellum ovate, 6.5–7.5 mm long, white or pinkish, recurved at right angles just above the middle, margins crenulate to crispate; apex apiculate; callus plate much-raised, broad, extending three-quarters of way to labellum apex. Column appendages oblong, c. 3 mm long, truncate. Flowers Oct.–Dec.
VVP. Restricted to a few sites in south-western Victoria growing in moist to wet grassland on dark basaltic loam.
Similar in appearance to Prasophyllum frenchii, but with more widely opening flowers and different structure of the labellum callus.
Prasophyllum viretrum is known from only 4 or 5 small populations.
|Bioregion||Occurrence status||Establishment means|
|Victorian Volcanic Plain||present||native|