Pterostylis petrosa

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Riverina rustyhood
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. petrosa
Binomial name
Pterostylis petrosa
Synonyms [1]

Oligochaetochilus petrosus(D.L.Jones & M.A.Clem.) D.L.Jones & M.A.Clem.

Contents

Pterostylis petrosa, commonly known as the Riverina rustyhood, is a plant in the orchid family Orchidaceae, endemic to New South Wales, Australia. It has a rosette of leaves at its base and up to eight dark brown flowers with transparent "windows", long spreading tips on the lateral sepals and a thin, brown, insect-like labellum.

Description

Pterostylis petrosa, is a terrestrial, perennial, deciduous, herb with an underground tuber. It has a rosette of between six and ten egg-shaped leaves at the base of the flowering spike, each leaf 15–25 mm (0.6–1 in) long and 6–9 mm (0.2–0.4 in) wide. The leaves are often withered by the time of flowering. Up to eight dark brown flowers with translucent panels and 30–38 mm (1.2–1.5 in) long, 10–12 mm (0.4–0.5 in) wide are borne on a flowering spike 90–150 mm (4–6 in) tall. Each flower is carried on the end of a thin stalk 14–20 mm (0.6–0.8 in) long. There are between two and four stem leaves with their bases wrapped around the flowering spike. The dorsal sepal and petals are joined to form a hood called the "galea" over the column with the dorsal sepal having a thread-like tip 8–10 mm (0.3–0.4 in) long. The lateral sepals are turned downwards and are wider than the galea. They are shallowly dished, hairy on their outer edges and suddenly taper to a thread-like tip, 14–20 mm (0.6–0.8 in). The labellum is brown, thin and insect-like, 7–9 mm (0.3–0.4 in) long and about 3 mm (0.1 in) wide with two long hairs on the "head" end and nine to twelve shorter hairs on each side of the "body". Flowering occurs from September to November. [2] [3] [4]

Taxonomy and naming

Pterostylis petrosa was first formally described in 1983 by David Jones and Mark Clements from a specimen collected near The Rock and the description was published in Muelleria . [1] The specific epithet (petrosa) is a Latin word meaning "rocky" or "stony", [5] referring to the habitat where this orchid grows, and to the type location. [2]

Distribution and habitat

The Riverina rustyhood occurs in the Riverina area where it grows on a few stony hills in rock crevices and on ledges. [2] [3] [4]

Related Research Articles

<i>Pterostylis stenochila</i> Species of orchid

Pterostylis stenochila, commonly known as the narrow-lip leafy greenhood, is a plant in the orchid family Orchidaceae and is endemic to Tasmania. Flowering plants have up to seven shiny, transparent green flowers with darker green stripes. The flowers have an insect-like labellum which is green with an emerald green stripe along its centre. Non-flowering plants have a rosette of leaves on a stalk, but flowering plants lack the rosette, instead having five or six stem leaves.

<i>Pterostylis atrans</i> Species of orchid

Pterostylis atrans, commonly known as the dark-tip greenhood or blunt-tongue greenhood, 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 spike. 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.

<i>Pterostylis basaltica</i> Species of orchid

Pterostylis basaltica, commonly known as the basalt rustyhood or basalt greenhood is a plant in the orchid family Orchidaceae and is endemic to Victoria. It has a rosette of leaves and eight to fifteen translucent white flowers with green and brown markings and a brownish, insect-like labellum. It is a rare species only known from a small area and is endangered.

<i>Pterostylis cheraphila</i> Species of orchid

Pterostylis cheraphila, commonly known as the floodplain rustyhood is a plant in the orchid family Orchidaceae and is endemic to a small area in Victoria. It has a rosette of leaves near its base and up to seven dark brown to blackish flowers with a dark brown, insect-like labellum. It is only found in the Little Desert area.

<i>Pterostylis despectans</i> Species of orchid

Pterostylis despectans, commonly known as the lowly rustyhood, is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. It has a rosette of leaves at its base and up to six flowers on long stalks, branching off a short flowering stem. The flowers have an insect-like labellum and often touch the ground.

<i>Pterostylis cobarensis</i> Species of orchid

Pterostylis cobarensis, commonly known as the inland rustyhood or Cobar rustyhood is a plant in the orchid family Orchidaceae and is endemic to Australia. It has a rosette of leaves and between two and ten hairy, green and brown flowers with translucent white "windows" and a fleshy, insect-like labellum. It grows in inland areas of eastern Australia.

<i>Pterostylis lingua</i> Species of orchid

Pterostylis lingua, commonly known as the large-lipped rustyhood, is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. It has a rosette of leaves and up to ten dark reddish-brown flowers with translucent "windows" and a blackish, insect-like labellum.

<i>Pterostylis maxima</i> Species of orchid

Pterostylis maxima, commonly known as the large rustyhood, is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. It has a rosette of leaves at its base and up to eight relatively large, dark brown flowers with transparent "windows" and a thin, dark insect-like labellum.

<i>Pterostylis planulata</i> Species of orchid

Pterostylis planulata, commonly known as the flat rustyhood, is a plant in the orchid family Orchidaceae and is endemic to Victoria. It has a rosette of leaves at its base and up to seven translucent flowers with green stripes. The flowers have a thin, dark green, insect-like labellum.

<i>Pterostylis squamata</i> Species of orchid

Pterostylis squamata, commonly known as the southern rustyhood or ruddyhood, is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. Flowering plants have up to ten translucent green flowers with reddish-brown markings and a hairy, insect-like labellum. Non-flowering plants have a rosette of four to eight egg-shaped leaves. This species is very similar to Pterostylis rufa which has a narrower labellum and other minor differences.

<i>Pterostylis woollsii</i> Species of orchid

Pterostylis woollsii, commonly known as the long-tailed rustyhood, is a plant in the orchid family Orchidaceae and is endemic to eastern Australia. It has a rosette of leaves at its base and up to six transparent flowers which have unusually long tips on their lateral sepals and a reddish-brown, insect-like labellum.

<i>Pterostylis hamata</i> Species of orchid

Pterostylis hamata, commonly known as the southern hooked rustyhood, is a plant in the orchid family Orchidaceae and is endemic to eastern Australia. It has a rosette of leaves and between two and twelve transparent flowers with green and brown markings, a thick, brown, insect-like labellum and dished lateral sepals.

Pterostylis arenicola, commonly known as the sandhill rustyhood is a plant in the orchid family Orchidaceae and is endemic to South Australia. It has a rosette of leaves near its base and up to ten reddish-brown and white flowers with a dark brown, insect-like labellum. Its distribution is now restricted to areas around Lake Alexandrina.

<i>Pterostylis calceolus</i> Species of orchid

Pterostylis calceolus, commonly known as the Bungonia rustyhood, is a plant in the orchid family Orchidaceae and is endemic to New South Wales. It has a rosette of overlapping leaves and between two and seven reddish-brown flowers with transparent "windows" and a fleshy brown, insect-like labellum. It is only known from near Bungonia.

<i>Pterostylis chaetophora</i> Species of orchid

Pterostylis chaetophora, commonly known as the Taree rustyhood, tall rusthood or ruddy hood is a plant in the orchid family Orchidaceae and is endemic to eastern Australia. It has a rosette of leaves at its base and up to twelve reddish-brown flowers with translucent "windows" and a fleshy, reddish-brown, bristly, insect-like labellum.

Pterostylis commutata, commonly known as the midland rustyhood is a plant in the orchid family Orchidaceae and is endemic to Tasmania. It has a rosette of leaves near its base and up to five translucent white and green flowers with a hairy, insect-like labellum. It is only found in a small area near Tunbridge and Ross.

Pterostylis excelsa, commonly known as the tall rustyhood, or dry land green-hood is a flowering plant in the orchid family Orchidaceae and is endemic to South Australia. It has a rosette of leaves and when flowering, up to twenty green or brown flowers which lean forward and have a thick, fleshy, partly hairy, insect-like labellum.

<i>Pterostylis gibbosa</i> Species of orchid

Pterostylis gibbosa, commonly known as the Illawarra rustyhood, or Illawarra greenhood, is a plant in the orchid family Orchidaceae and is endemic to New South Wales. It has a rosette of leaves at its base and up to nine bright green flowers with translucent "windows", relatively wide lateral sepals with short-pointed tips and a dark, fleshy, insect-like labellum.

Pterostylis mitchellii, commonly known as Mitchell's rustyhood, is a plant in the orchid family Orchidaceae and is endemic to eastern Australia. Both flowering and non-flowering plants have a rosette of leaves and flowering plants have up to fifteen flowers which have wide flanges on the petals and an insect-like labellum with a white "head".

Pterostylis saxicola, commonly known as the Sydney plains rustyhood, or Sydney plains greenhood, is a plant in the orchid family Orchidaceae and is endemic to New South Wales. It has a rosette of leaves at its base and up to ten reddish-brown flowers with translucent "windows", relatively wide lateral sepals with short-pointed tips and a dark brown, fleshy, insect-like labellum.

References

  1. 1 2 3 "Pterostylis petrosa". APNI. Retrieved 5 July 2017.
  2. 1 2 3 Jones, David L.; Clements, Mark A. (1983). "New species of Pterostylis R.Br. (Orchidaceae) from New South Wales and Victoria" (PDF). Muelleria. 8 (1): 79–81. Retrieved 5 July 2017.
  3. 1 2 Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 326. ISBN   978-1877069123.
  4. 1 2 Jones, David L. "Pterostylis petrosa". Royal Botanic Gardens Sydney: plantnet. Retrieved 5 July 2017.
  5. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 757.