Dark-tip greenhood | |
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Pterostylis atrans growing near Mount Toolebewong | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Order: | Asparagales |
Family: | Orchidaceae |
Subfamily: | Orchidoideae |
Tribe: | Cranichideae |
Genus: | Pterostylis |
Species: | P. atrans |
Binomial name | |
Pterostylis atrans | |
Synonyms [1] | |
Pterostylis atrans, commonly known as the dark-tip greenhood [2] or blunt-tongue greenhood, [3] is a species of orchid endemic to south-eastern Australia. As with similar greenhoods, plants in flower differ from those that are not flowering. The non-flowering plants have a rosette of leaves flat on the ground, but the plants in flower have a single flower with leaves on the flowering stem. In this species, the flower is green and reddish brown with a protruding sinus and small club-like tips on the ends of the lateral sepals.
Pterostylis atrans is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of ovate leaves, each leaf 10–35 mm long and 10–30 mm wide. Flowering plants have a single flower 14–20 mm long and 10–12 mm wide borne on a stem 150–300 mm high with between three and five spreading stem leaves. The flowers are green with a reddish-brown, down curved tip. The dorsal sepal and petals are fused, forming a hood or "galea" over the column and the dorsal sepal has a thread-like tip 6–9 mm long. The lateral sepals are held closely against the galea, have erect, thread-like tips 15–20 mm long with small club-like tips and a protruding, platform-like sinus between their bases. The labellum is 9–11 mm long, about 3 mm wide, green with a blunt brown tip that is just visible above the sinus. Flowering occurs from November to April. [2] [3] [4]
Pterostylis atrans was first formally described in 1994 by David Jones from a specimen collected in the Brindabella Range. The description was published in Muelleria . [1] [4] The specific epithet is "from the Latin word atrans, darkening, in reference to the dark red-brown colouration towards the apex of the galea". [2]
The dark-tip greenhood mostly grows among grasses in high rainfall forests in Victoria, Tasmania and southern New South Wales. [2] [3] [5]
Pterostylis coccina, commonly known as the scarlet greenhood, is a species of orchid endemic to eastern Australia. 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. In this species, the rosette leaves are relatively large and dark green, and the flowers are white, and bluish-green or red. It grows in New South Wales and north-eastern Victoria.
Pterostylis grandiflora, commonly known as the cobra greenhood or superb greenhood, is a species of orchid endemic to south-eastern Australia. As with similar orchids, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves but the flowering plants lack a rosette and have a single flower with leaves on the flowering spike. This greenhood has a green and white, striped flower with deep red-brown markings especially on its "galea", and a sharply pointed dorsal sepal.
Pterostylis alpina, commonly known as the mountain greenhood, is a species of orchid endemic to south-eastern Australia. It has a rosette of fleshy leaves at the base and usually only one white flower with green markings and back-swept lateral sepals.
Pterostylis trullifolia, commonly known as the trowel-leaved greenhood, is an orchid species endemic to New Zealand. As with similar orchids, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of wrinkled, trowel-shaped leaves but the flowering plants have a single flower with a bulging, platform-like sinus between the lateral sepals and leaves on the flowering spike.
Pterostylis aestiva, commonly known as the long-tongued summer greenhood, is a species of orchid endemic to south-eastern Australia. 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.
Pterostylis alveata, commonly known as coastal greenhood, is a species of orchid endemic to south-eastern Australia. As with similar greenhoods, the flowering plants differ from those which are not flowering. In this species, the non-flowering plants have a rosette of leaves flat on the ground but the flowering plants have a single small, shiny green and white flower with leaves on the flowering spike.
Pterostylis fischii, commonly known as Fisch's greenhood, is a species of orchid endemic to south-eastern Australia. 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 tawny-coloured flowers, a dorsal sepal with a long thread-like tip and a labellum which is hidden inside the flower.
Pterostylis cucullata, commonly known as the leafy greenhood, is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. It has a rosette of fleshy leaves at its base and a single white, green and reddish-brown flower.
Pterostylis decurva, commonly known as the summer greenhood, is a species of orchid endemic to south-eastern Australia. As with similar greenhoods, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves but the flowering plants have a single flower with leaves on the flowering spike. This greenhood usually flowers in summer and has a white flower with green stripes and a brownish tinge. It is similar to P. aestiva but has paler green flowers.
Pterostylis dolichochila, commonly known as the long-tongued shell orchid, is a species of orchid endemic to southern Australia. As with similar orchids, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves but the flowering plants have a single flower with leaves on the flowering spike. This greenhood has a green and white flower with reddish-brown stripes and a sharply pointed dorsal sepal.
Pterostylis monticola, commonly known as the large mountain greenhood, is a species of orchid endemic to south-eastern Australia. It has a rosette of fleshy leaves at the base of the plant and a single dark green and white flower. It grows in alpine and sub-alpine colonies.
Pterostylis aneba is a species of orchid endemic to south-eastern Australia. It is a recently described and poorly-known greenhood similar to Pterostylis alpina and P. monticola. It has a rosette of fleshy leaves at the base of the plant and a single green and white flower. It grows in alpine and sub-alpine habitats.
Pterostylis longipetala, commonly known as the curved greenhood, is a species of orchid endemic to eastern Australia. 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 dark green, brown and white flowers which lean slightly forwards and have sharply-pointed petals and a long, curved labellum.
Pterostylis aquilonia, commonly known as the northern cobra greenhood, is a species of orchid endemic to Queensland. As with similar orchids, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves, but the flowering plants lack a rosette and have a single flower with leaves on the flowering spike. This greenhood has a relatively large green, white and reddish-brown self-pollinating flower.
Pterostylis elegans, commonly known as the elegant greenhood, is a species of orchid endemic to New South Wales. Non-flowering plants have a rosette of leaves flat on the ground but flowering plants have a single translucent white and dark green flower with reddish-brown markings near the tip.
Pterostylis erythroconcha, commonly known as the red shell orchid, is a species of orchid endemic to South Australia. As with similar orchids, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves but the flowering plants have a single flower with leaves on the flowering spike. This greenhood has a white and green flower with reddish brown markings and a long, fleshy, curved labellum.
Pterostylis reflexa, commonly known as the dainty greenhood, is a species of orchid endemic to New South Wales. 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 stem. This greenhood has a relatively large white, green and light brown flower with a long, curved dorsal sepal and a protruding labellum.
Pterostylis rogersii, commonly known as the curled-tongue shell orchid, is a species of orchid endemic to the south-west of Western Australia. As with similar orchids, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves but the flowering plants lack a rosette and have a single flower with leaves on the flowering spike. This greenhood usually has a white and reddish-brown striped flower with a long, curved labellum and is found along the south coast between Binningup and Esperance.
Pterostylis russellii, commonly known as Russell's greenhood, is a species of orchid endemic to eastern Australia. Non-flowering plants have a rosette of leaves flat on the ground but flowering plants have a single shiny white and dark green flower on a flowering stem lacking a rosette but with a few spreading stem leaves.
Pterostylis scoliosa, commonly known as the small kinked greenhood, is a species of orchid endemic to Queensland. 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 stem. This greenhood has a white, pale green and pale brown flower with a kinked or curved labellum protruding above the sinus between the lateral sepals.