Trans. & Proc. Roy. Soc. South Australia 32: 11 (1908) APNI
Flowering stem slender, 15–30 cm tall. Leaf-blade to 15 cm long, 2–3 mm diam. at base, apex erect, often partially senescent at flowering time. Flowers 7–25, small, fragrant, yellowish green to brownish, in a moderately loose spike 5–11 cm long; ovary obovoid, c. 3 mm long; sepals 7–8 mm long, dorsal sepal ovate-lanceolate, deflexed, lateral sepals linear-lanceolate, free, more or less parallel, straight or recurved; petals linear-lanceolate, 6–7 mm long. Labellum subsessile, ovate-lanceolate, 4.5–5.5 mm long, porrect at base, reflexed at about 90 deg. near middle, lamina cream to reddish, margins crinkled to slightly irregular; callus plate smooth, fleshy, raised, green or brownish, extending well beyond labellum bend. Column appendages linear-oblong, c. 2 mm long. Flowers Sep.–Oct.
Some authors regard P. occidentale as being endemic to South Australia with several similar-looking undescribed taxa present in Victoria (see Prasophyllum sp. aff. occidentale C, Prasophyllum aff. occidentale D and Prasophyllum sp. aff. occidentale E). Prasophyllum aff. occidentale A sensu Rouse 2002 is regarded here as a synonym of P. occidentale, the two being quite similar in their salient features.
|Bioregion||Occurrence status||Establishment means|
|Victorian Volcanic Plain||present||native|
|Northern Inland Slopes||present||native|
|New South Wales|