Pterostylis despectans

Last updated

Lowly rustyhood
Pterostylis despectans.jpg
Pterostylis despectans growing near Inglewood in Victoria
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. despectans
Binomial name
Pterostylis despectans
Synonyms [1]

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.

Contents

Description

Pterostylis despectans, is a terrestrial, perennial, deciduous, herb with an underground tuber. It has a rosette of between six and ten leaves at the base of the flowering spike, each leaf 10–20 mm (0.4–0.8 in) long and 6–8 mm (0.2–0.3 in) wide. The leaves are often withered by the time of flowering. Up to six translucent flowers with green and brown markings and 30–38 mm (1.2–1.5 in) long, 6–8 mm (0.2–0.3 in) wide are borne on a flowering spike 30–50 mm (1–2 in) tall. Each flower is carried on the end of a long, thin stalk. Three or four papery bracts are 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 10–13 mm (0.4–0.5 in) long. The lateral sepals are slightly wider than the galea and often touch the ground. They are shallowly dished, densely hairy on their outer edges and suddenly taper to a thread-like tip, 20–26 mm (0.8–1 in). The labellum is brown to green, thin and insect-like, about 5 mm (0.2 in) long and 2 mm (0.08 in) wide. The "head" end has two long bristles and there are up to 10 to 16 shorter bristles on the side. Flowering occurs from November to December. [2] [3] [4] [5]

Taxonomy and naming

The lowly greenhood was first formally described in 1950 by William Nicholls who gave it the name Pterostylis rufa var. despectans and published the description in The Victorian Naturalist . The type specimen was collected near Maryborough in Victoria. [6] [7] In 1989, Mark Clements and David Jones raised it to species status. [1] [8]

Distribution and habitat

Pterostylis despectans has a restricted distribution in each of the three Australian states in which it occurs. In New South Wales there is only a single population growing in grassland near Moama in the Riverina district. In Victoria it grows in forest near Maryborough, grassland near Bendigo and woodland near Horsham and in South Australia in parts of the Northern Lofty flora region. [2] [3] [4] [5]

Conservation

Pterostylis despectans is classified as "endangered" under the Victorian Government Flora and Fauna Guarantee Act 1988 , "critically endangered" in New South Wales, "endangered" in South Australia and as "endangered" (EN) under the Australian Government Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act). [3] [4] [5] [9] The main threats to this species are habitat loss and fragmentation, invasive species and low reproduction rates. [4]

Related Research Articles

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

Pterostylis chlorogramma, commonly known as the green-striped leafy greenhood, is a plant in the orchid family Orchidaceae and is endemic to Victoria. Flowering plants have up to seven translucent green flowers with darker green stripes. The flowers have a green labellum with a darker stripe down the middle. Non-flowering plants have a rosette of leaves on a short, thin stalk but flowering plants lack the rosette, instead having five to seven stem leaves.

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

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.

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

Pterostylis biseta, commonly known as the bristled 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 seven relatively large, translucent flowers with green and brown marking with a brown to green insect-like labellum with bristly hairs. It occurs in New South Wales, South Australia and Victoria although in the latter state it has been separated into three species and is also under review in New South Wales.

<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 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 anaclasta is a species of flowering plant in the orchid family Orchidaceae and is endemic to a restricted part of Queensland. It has a rosette of about 6 sessile leaves and about 4 transparent white flowers with bright reddish lines and markings, a reddish brown labellum with white hairs, and lateral sepals strongly turned backwards.

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.

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.

<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.

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

Pterostylis lineata, commonly known as the Blue Mountains leafy greenhood, is a plant in the orchid family Orchidaceae and is 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 on a short stalk but the flowering plants lack a rosette and have up to seven dark green flowers with translucent "windows" on a flowering stem with stem leaves. The labellum is light brown with a black strip along its mid-line.

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".

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

Pterostylis rufa, commonly known as the red 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 fifteen bright reddish-brown flowers with translucent white "windows" and a dark brown, insect-like labellum. It occurs from southern Queensland to south-eastern South Australia.

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 despectans". APNI. Retrieved 12 May 2017.
  2. 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.
  3. 1 2 3 Jeanes, Jeff. "Pterostylis despectans". Royal Botanic Gardens Victoria: vicflora. Retrieved 12 May 2017.
  4. 1 2 3 4 "Conservation advice Pterostylis despectans" (PDF). Australian Government Department of the Environment. Retrieved 12 May 2017.
  5. 1 2 3 "Pterostylis despectans - profile". New South Wales Government Office of the Environment and Heritage. Retrieved 12 May 2017.
  6. "Pterostylis rufa var. despectans". APNI. Retrieved 12 May 2017.
  7. Nicholls, William Henry (1950). "Contributions to the Orchidaceae of Australia - 1". The Victorian Naturalist. 66 (11): 215. Retrieved 12 May 2017.
  8. Clements, Mark Alwin (1989). "Catalogue of Australian Orchidaceae" (PDF). Australian Orchid Research. 1: 122.
  9. "Census of South Australian Plants - Pterostylis". State Herbarium of South Australia. Retrieved 12 May 2017.