Pterostylis hamata

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.

Southern hooked rustyhood
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. hamata
Binomial name
Pterostylis hamata
Blackmore & Clemesha[1]
Synonyms[2]

Oligochaetochilus hamatus (Blackmore & Clemesha) Szlach.

Description

Pterostylis hamata, is a terrestrial, perennial, deciduous, herb with an underground tuber. It has a rosette of between six and fifteen egg-shaped leaves at the base of the flowering spike, each leaf 20–30 mm (0.8–1 in) long and 6–12 mm (0.2–0.5 in) wide. Between two and twelve transparent flowers with green and brown markings, each flower 19–22 mm (0.7–0.9 in) long and 7–8 mm (0.3–0.3 in) wide, are borne on a flowering spike 200–400 mm (8–20 in) tall. Two to eight stem leaves are wrapped around the flowering spike. The dorsal sepal and petals form a hood or "galea" over the column with the dorsal sepal having an downturned, thread-like point 4–7 mm (0.2–0.3 in) long. The lateral sepals turn downwards and are joined for about half their length and shallowly dished with the edges curved inwards. The lateral sepals also suddenly narrow to thread-like tips 12–15 mm (0.5–0.6 in) long which curve forwards with hooked ends. The labellum is brown, fleshy, insect-like, about 5 mm (0.2 in) long, 2 mm (0.08 in) wide and grooved and has long and short bristles around its edges. Flowering occurs from September to November.[3][4][5]

Taxonomy and naming

Pterostylis hamata was first formally described in 1968 by John Blackmore and Stephen Clemesha from a specimen collected near Koorawatha and the description was published in The Orchadian.[1] The specific epithet (hamata) is a Latin word meaning "hooked".[6]

Distribution and habitat

The southern hooked rustyhood occurs in the eastern half of New South Wales, the north-east corner of Victoria and in Queensland, growing in rocky places in open forest.[3][4][5]

References
  1. "Pterostylis hamata". APNI. Retrieved 2 June 2017.
  2. "Pterostylis hamata". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  3. Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 332. ISBN 978-1877069123.
  4. Jones, David L. "Pterostylis hamata". Royal Botanic Garden Sydney: plantnet. Retrieved 2 June 2017.
  5. Jeanes, Jeff. "Pterostylis hamata". Royal Botanic Garden Melbourne: vicflora. Retrieved 2 June 2017.
  6. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 393.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.