Microtis, commonly known as onion orchids or mignonette orchids is a genus of about 20 species of plants in the orchid family, Orchidaceae. Onion orchids are terrestrial herbs with a single leaf at the base of the plant. They are similar to orchids in the genus Prasophyllum in that they have an onion-like leaf. The flowers are small but often scented and attractive to their insect pollinators. They are widespread in Asia, Australia and some Pacific islands.
Microtis media, commonly known as the common mignonette orchid, is a species of herbaceous plants of the family Orchidaceae endemic to the south–west of Western Australia. It has a single tubular leaf and up to one hundred small, yellowish green flowers arranged along the flowering stem.
Caladenia georgei, commonly known as the tuart spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single, hairy leaf and up to three whitish to yellowish-green flowers flushed with red and which have a white labellum with a red tip.
Caladenia graminifolia, commonly known as the grass-leafed spider orchid is a species of orchid endemic to the south-west of Western Australia. It has a single glabrous leaf and one or two short-lived, greenish-yellow and red flowers which have a narrow labellum with long teeth on its sides.
Caladenia thinicola, commonly known as the Scott River spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single erect, hairy leaf and up to four yellowish-green and red flowers with a fringe of long teeth on the sides of the labellum and thick brown, club-like glandular tips on the sepals.
Caladenia xantha, commonly known as the primrose spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single erect, hairy leaf and up to three yellow flowers with a cream-coloured, brown-striped labellum.
Microtis media subsp. media, commonly known as the common mignonette orchid, is a species of orchid which is endemic to the south–west of Western Australia. It is a common, widespread orchid with a single smooth, tubular leaf and a flowering spike with up to one hundred small green flowers. It differs from Microtis media subsp. densiflora in the shape of its flower spike and the shape of its labellum.
Microtis alba, commonly known as the white mignonette orchid or slender onion-orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single hollow, onion-like leaf and up to sixty small, green and white flowers with a strong musky fragrance. It is much more common after a fire the previous summer than in unburned country.
Microtis alboviridis, commonly known as the scented mignonette orchid or ghost mignonette orchid is a species of orchid endemic to the south-west of Western Australia. It has a single hollow, onion-like leaf and up to forty or more small, greenish-white, sweetly scented flowers. It is similar to the white mignonette orchid but has smaller flowers and flowers abundantly in the absence of fire.
Microtis atrata, commonly known as the swamp mignonette orchid or yellow onion orchid and sometimes as Microtidium atratum, is a species of orchid endemic to southern Australia. It has a single thin leaf and up to forty or more yellowish-green flowers. The flowers are the smallest of any Australian ground-dwelling orchid. The orchid usually grows in large colonies after fire and although small, are easily seen because of their very large numbers in their blackened surroundings.
Microtis brownii, commonly known as the sweet mignonette orchid or sweet onion orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single hollow, onion-like leaf and up to sixty small, green and white scented flowers well-spaced along the flowering stem. It usually grows in swampy places, flowers more prolifically after summer fires and sometimes forms very large colonies.
Microtis media subsp. densiflora, commonly known as the dense mignonette orchid, is a species of orchid which is endemic to the south–west of Western Australia. It has a single smooth, tubular leaf and a flowering spike with up to one hundred and fifty small yellowish-green flowers. It differs from Microtis media subsp. media in the shape of its flower spike and the shape of its labellum.
Microtis quadrata, commonly known as the south coast mignonette orchid or south coast onion orchid, is a species of orchid endemic to south-west coastal areas of Western Australia. It has a single thin, hollow, onion-like leaf and up to one hundred small, pale green flowers. This onion orchid grows on low mounds in swamps, often with other species of mignonette orchids, and flowers much more prolifically after fire.
Microtis eremaea, commonly known as the slender mignonette orchid or inland onion orchid is a species of orchid endemic to the south-west of Western Australia and western South Australia. It has a single thin, hollow, onion-like leaf and up to fifty small greenish-yellow flowers. The flowers have a distinctive heart-shaped labellum and the orchid generally grows in more inland areas than most other onion orchids.
Microtis eremicola, commonly known as the desert mignonette orchid or dryland onion orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single hollow, onion-like leaf and up to fifty small, dull green to greenish-yellow flowers. This onion orchid is common in soil pockets on granite outcrops in inland areas, mostly between Hyden and Balladonia.
Microtis familiaris, commonly known as the coastal mignonette orchid or coastal onion orchid is a species of orchid endemic to the south-west coastal region of Western Australia. It has a single hollow, onion-like leaf and up to twenty small, green to greenish-yellow, sweetly scented, widely spaced flowers. It often grows with large populations of other Microtis orchids but only flowers after fire.
Microtis graniticola, commonly known as the granite mignonette orchid or granite onion orchid is a species of orchid endemic to the south-west of Western Australia. It has a single thin, hollow, onion-like leaf and up to sixty small green to greenish-yellow flowers. It grows in soil pockets on granite outcrops, especially where the soil receives run-off during rainy weather.
Microtis orbicularis, commonly known as the dark mignonette orchid, is a species of orchid endemic to southern Australia. It has a single thin, more or less hollow, onion-like leaf and up to fifty small yellowish-green and red flowers. The plants grow in winter-wet areas, often in shallow water and unlike the similar M. cupularis do not turn black as they dry.
Microtis pulchella, commonly known as the beautiful mignonette orchid or beautiful onion orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single hollow, onion-like leaf and up to twenty five white, thinly textured flowers with a slight perfume. It only flowers after fire and only sometimes produces short, thread-like leaves in the absence of fire.
Eriochilus dilatatus, commonly known as the white bunny orchid, is a plant in the orchid family Orchidaceae and is endemic to Western Australia. It is a common and widespread, slender ground orchid with a single leaf and up to fifteen small white and greenish flowers with reddish or brownish markings and a hairy labellum.
