Pterostylis rubescens

Pterostylis rubescens, commonly known as the blushing tiny greenhood,[2] 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 at the base and have up to eighteen tiny green, white and brownish flowers.

Blushing tiny greenhood
Pterostylis rubescens growing near Canberra
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. rubescens
Binomial name
Pterostylis rubescens
Synonyms[1]

Speculantha parviflora (R.Br.) D.L.Jones & M.A.Clem.

Description

Pterostylis rubescens is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of between five and fifteen egg-shaped to heart-shaped leaves which lie flat on the ground. Each leaf is 6–25 mm (0.2–1 in) long and 3–18 mm (0.1–0.7 in) wide. Flowering plants have between three and eighteen well-spaced flowers 10–18 mm (0.4–0.7 in) long are borne on a thin, wiry spike 150–600 mm (6–20 in) high. Three to six leaves are wrapped around the flowering spike. The flowers are almost spherical, green and white near the base, brownish near the tip and age to pinkish. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal curves forward near the top and has a rough tip. The lateral sepals are erect and held closely against the galea with narrow tips about 2 mm (0.08 in) long that do not project above the galea. The sinus between the bases of the lateral sepals bulges forward and has a small notch in the centre. The labellum is about 4 mm (0.2 in) long, 2 mm (0.08 in) wide and is not visible above the sinus. Flowering occurs from January to May.[3][4]

Taxonomy and naming

The blushing tiny greenhood was first formally described in 2008 by David Jones who gave it the name Speculantha rubescens. The description was published in The Orchadian from a specimen collected in the Conimbla National Park.[5] In 2010 Gary Backhouse changed the name to Pterostylis rubescens.[1] The specific epithet (rubescens) is derived from the Latin word ruber meaning "red" or "reddish"[6]:651 with the suffix -escens meaning "becoming".[6]:44

Distribution and habitat

Pterostylis rubescens grows on slopes and ridges in open forest and woodland. It is widespread in northern Victoria and on the central and southern tablelands of New South Wales.[3][4]

References
  1. "Pterostylis rubescens". APNI. Retrieved 8 June 2017.
  2. "Speculantha rubescens". Canberra Nature Map. Retrieved 8 June 2017.
  3. Jeanes, Jeff. "Pterostylis rubescens". Royal Botanic Gardens Victoria: vicflora. Retrieved 8 June 2017.
  4. "Pterostylis rubescens". Royal Botanic Garden Sydney: plantnet. Retrieved 8 June 2017.
  5. "Speculantha rubescens". APNI. Retrieved 8 June 2017.
  6. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.