Prasophyllum rousei D.L.Jones

Austral. Orchid Review 82 (2): 54-56 (2017)

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: endangered (e)

Flowering stem usually moderately stocky, to c. 60 cm tall. Leaf-blade 20–30 cm long, base 2–5 mm diam., usually withered at anthesis. Flowers 10–25, green to greenish-bronze with white labellum and lateral petals, sweetly citrus-scented, in a fairly dense spike 5–12 cm long; ovary obovoid, 5–6 mm long, glossy; sepals 7–10 mm long, dorsal sepal decurved, ovate-lanceolate, lateral sepals free, almost parallel, slightly recurved, apex acute, entire or slightly and asymmetrically bifid; petals 6–9.5 mm long, obovate-spathulate, white at least distally, usually green at base. Labellum 7.5–9.5 mm long when flattened, rather broadly ovate-lanceolate, white, crystalline, recurved at about 90 deg. near the middle, proximal half erect to recurved, not or barely protruding between lateral sepals, margins strongly undulate or crisped-crenulate; callus green at least near base, broadly emarginate, ending just past the labellum bend, basal swelling prominent, pyramidal. Column appendages oblong, c. 3 mm long, white, obtuse. Flowers Oct.–Nov.

Also S.A. Known with certain in Victoria only from a few sites in Wyperfeld National Park where occurring in mallee-heath communities on deep white sand. A 1967 collection from Hattah-Kulkyne National Park, without habitat notes, appears to be the same species but the specimen is poor and the habitat atypical.

Created by: Neville Walsh, 2019-03-26
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life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Asparagales
family Orchidaceae
genus Prasophyllum
Higher taxa