Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diureae
Subtribe: Prasophyllinae
Genus: Microtis
Species: Microtis unifolia   
Synonyms: Microtis porrifolia
Common name: Common Onion Orchid

Microtis unifolia is a slender to robust terrestrial tuberous herb, usually 20–60 cm high with a single tubular leaf  8–60 cm long.  The flower stem emerging from within the leaf about one third to halfway up the leaf. 
The flower stem can go up to a meter high. This stem can have 5 - 40 flowers per raceme and are numerous and closely spaced. The 3cm wide flowers are green to yellow-green in colour and are dorsal sepal hooded with a pointed tip. The lateral sepals curled backwards. The labellum is irregular oblong with a very coarse edge. It is narrowest at its mid-length. The stigma is not wider than the column. It flowers September to December and is common and found growing in rough grassland.

Photographed November with stalk and flower raceme
Microtis unifolia-8.JPG

Microtis unifolia raceme
Microtis unifolia.JPG

Microtis unifolia Onion orchid.JPG

The small 3 mm flowerMicrotis unifolia-4.JPG

Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/