Corybas, commonly known as helmet orchids, is a genus of about 120 species of plants in the orchid family, Orchidaceae. Helmet orchids are small, perennial, deciduous herbs and are nearly always terrestrial. They have a single leaf at their base and a single flower on a short stalk, the flower dominated by its large dorsal sepal and labellum. Species of Corybas are found in Australia, New Zealand, New Guinea, Southeast Asia, the Himalayas, southern China, many Pacific islands and a few sub-Antarctic islands.
Corybas aconitiflorus, commonly known as the cradle orchid or spurred helmet orchid, is a species of terrestrial orchid endemic to eastern Australia, occurring from south-east Queensland to Tasmania. The small flowers have a hooded appearance as the uppermost sepal hides most of the rest of the flower. It is the type species of the genus Corybas.
Caladenia bartlettii is a plant in the orchid family Orchidaceae and is endemic to New Zealand. It is a ground orchid with a single narrow, hairy leaf and a thin wiry stem usually bearing one short-lived mauve to pink flower.
Pterostylis alobula, commonly known as the winter greenhood, is a species of orchid endemic to New Zealand. As with similar greenhoods, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves flat on the ground but the flowering plants have a single flower with leaves on the flowering spike. This greenhood has pale green and white-striped flowers, similar to those of another New Zealand greenhood, P. trullifolia but are larger and paler in colour.
Pterostylis irsoniana is a species of greenhood orchid endemic to New Zealand. There are up to five erect leaves on the flowering stem with a single dark green flower with white stripes and a reddish tinge on the tips. It has a distinctive curved labellum with a curled tip with a dark red callus.
Pterostylis montana is a species of greenhood orchid endemic to New Zealand. Flowering plants have erect, linear leaves on the flowering stem with a single green flower with translucent white stripes and an unusual twisted labellum.
Corybas carsei, commonly known as the swamp helmet orchid, is a species of terrestrial orchid endemic to New Zealand. It is found only in Whangamarino Wetland in the Waikato District, where the population of fewer than 250 plants is critically endangered.
Corybas acuminatus, commonly known as the dancing spider orchid or helmet flower, is a species of terrestrial orchid endemic to New Zealand. It has a triangular, sharply pointed leaf and a small translucent, greenish-white flower with purple markings and with very long sepals. It is found on both the main islands of New Zealand and also some of the off-shore islands.
Corybas cerasinus, commonly known as the red helmet orchid, is a species of terrestrial orchid endemic to tropical north Queensland. It has a single bluish green, heart-shaped leaf and a cherry red to dark maroon flower with its curved dorsal sepal obscuring its labellum which has an upturned tip.
Corybas cheesemanii, commonly known as Cheesemans spider orchid or spurred helmet orchid, is a species of terrestrial orchid endemic to New Zealand. It is a small orchid with a single pale green, heart-shaped leaf and usually only a single flower variously coloured from maroon to completely white. It usually grows in deep shade, often in deep leaf litter and flowers in autumn and winter.
Corybas confusus, commonly known as the spider orchid is a species of terrestrial orchid endemic to New Zealand. It has a single heart-shaped leaf and a single dark green or light green flower with reddish maroon streaks and blotches and long, thread-like lateral sepals and petals. It grows in highland areas on both main islands.
Corybas fimbriatus, commonly known as the fringed helmet orchid, is a species of terrestrial orchid endemic to eastern Australia. It has a broad egg-shaped to round leaf and a dark reddish purple to crimson flower with translucent patches. It is similar to C. hispidus but its labellum lacks a creamy-white centre and is not covered with bristly hairs.
Corybas fordhamii, commonly known as the banded helmet orchid or swamp helmet orchid, is a species of terrestrial orchid endemic to south-eastern Australia. It has an egg-shaped to heart-shaped leaf and a reddish to reddish purple flower which leans forward. It is similar to C. unguiculatis which does not grow in swamps and has a different labellum.
Corybas oblongus is a species of terrestrial orchid endemic to New Zealand. It has a solitary oval-shaped leaf, often patterned with maroon, and a reddish-purple and white flower with a fimbriate labellum.
Corybas obscurus is a species of terrestrial orchid endemic to New Zealand. It has a solitary heart-shaped leaf and a deep crimson or nearly black flower and is part of the Corybas trilobus aggregate.
Corybas trilobus is a species of terrestrial orchid endemic to New Zealand. It is part of the C. trilobus aggregate, whose members are characterized by a funnel or dish-shaped labellum and an often heart or kidney-shaped solitary leaf.
Corybas sanctigeorgianus is a species of terrestrial orchid endemic to the North Island of New Zealand. It is part of the C. trilobus aggregate, whose members are characterized by a funnel or dish-shaped labellum and an often heart or kidney-shaped solitary leaf.
Corybas hatchii is a species of terrestrial orchid endemic to New Zealand. It has a solitary rounded leaf, often flecked with maroon, and a single pale green and maroon flower.
Corybas hypogaeus is a species of terrestrial orchid endemic to the New Zealand. It is part of the C. trilobus aggregate, whose members are characterized by a funnel or dish-shaped labellum and an often heart or kidney-shaped solitary leaf.
Corybas iridescens is a species of terrestrial orchid endemic to the New Zealand. It has a solitary fleshy oval-shaped leaf and a single deep crimson flower, sometimes accompanied with green, with a tapering dorsal sepal.
