Plants of the Castlemaine District
Onion Orchids (Microtis species)
Family: Orchidaceae (Orchid family).
Natives of Eastern Australia.
The onion orchids have small green usually crowded flowers. The leaves are round and onion-like. They are very common and can grow in profusion.
They flower in late spring.
Slender Onion Orchid (Microtis parviflora)
- the labellum is triangular, and not notched
- the labellum does not have a raised callus (swelling) at its tip.
It is common and widespread.
Common Onion Orchid (Microtis unifolia)
- the tongue is cut off more or less square, or slightly bilobed.
- the dorsal sepal is blunt ended.
This is the most common of the local onion orchids.
Notched Onion Orchid (Microtis arenaria)
- the dorsal sepal has a pointed upturned lip
- the labellum is prominently bilobed.
It is the least common of the species.
Photos: Onion Orchids. 1: Common Onion-orchid. Spring Gully. 2: Slender Onion-orchid. Castlemaine. 3: Notched Onion-orchid. Maldon