Pterostylis flavovirens
| Coastal banded greenhood | |
|---|---|
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Subfamily: | Orchidoideae |
| Tribe: | Cranichideae |
| Genus: | Pterostylis |
| Species: | P. flavovirens
|
| Binomial name | |
| Pterostylis flavovirens | |
| Synonyms[1] | |
|
Bunochilus flavovirens D.L.Jones | |
Pterostylis flavovirens, commonly known as the coastal banded greenhood,[2] is a plant in the orchid family Orchidaceae that is endemic to South Australia. As with other similar orchids, non-flowering plants differ from those in flower. Flowering plants have up to seven pale to translucent green flowers with darker green stripes. The flowers have an insect-like labellum which is yellowish green with a slightly darker green stripe along its centre. Non-flowering plants have a rosette of leaves on a stalk, but flowering plants lack the rosette, instead having three to six stem leaves.
Description
[edit]Pterostylis flavovirens, is a terrestrial, perennial, deciduous, herb with an underground tuber. Non-flowering plants have a rosette of between three and five egg-shaped leaves, each leaf 5–27 mm (0.2–1 in) long and 3–9 mm (0.1–0.4 in) wide on a stalk 20–50 mm (0.8–2 in) tall. Flowering plants have up to seven transparent pale to translucent green flowers with darker green stripes on a flowering spike 30–200 mm (1–8 in) high. The flowering spike has between three and six egg-shaped stem leaves which are 5–40 mm (0.2–2 in) long and 2–9 mm (0.08–0.4 in) wide. The dorsal sepal and petals are fused, forming a hood or "galea" over the column with the dorsal sepal 12–15 mm (0.5–0.6 in) long and shallowly curved with a brownish tip. The petals are 9–12 mm (0.4–0.5 in) long, about 2 mm (0.08 in) wide with narrow flanges on their outer edges. The lateral sepals are 9–13.5 mm (0.4–0.5 in) and joined for all but about 3 mm (0.1 in), forming a structure 4–6 mm (0.16–0.24 in) wide. The labellum is insect-like, 4.5–6 mm (0.18–0.24 in) long, about 2 mm (0.08 in) wide, with a darker green stripe along its centre and a mound on the "head" end. Flowering occurs from July to September.[3]
Taxonomy and naming
[edit]This orchid was first formally described in 2006 by David Jones who gave it the name Bunochilus flavovirens. The description was published in the journal Australian Orchid Research from a specimen collected near Port Lincoln.[4] In 2008 Robert Bates changed the name to Pterostylis flavovirens.[5] The specific epithet (flavovirens) is derived from the Latin words flavus meaning “golden-yellow” or "yellow"[6]: 872 and virens meaning "green",[6]: 383 [3] referring to the colour of the labellum.[3]
Distribution and habitat
[edit]Pterostylis flavovirens is found in coastal areas of the Eyre Peninsula, Yorke Peninsula, Southern Lofty, Kangaroo Island and South-Eastern botanical regions of South Australia.[7] It often grows in accumulated leaf litter under small trees and shrubs.[3]
References
[edit]- ^ a b "Pterostylis flavovirens". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
- ^ "Culture of fast multiplying (FM) terrestrial orchids". Native Orchids of South Australia. Retrieved 27 July 2017.
- ^ a b c d Jones, David L. (1998). "Contributions to Tasmanian Orchidology". Australian Orchid Research. 3: 132.
- ^ "Bunochilus flavovirens". APNI. Retrieved 10 April 2018.
- ^ "Pterostylis flavovirens". APNI. Retrieved 10 April 2018.
- ^ a b Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press.
- ^ "Census of South Australian plants - Pterostylis". State Herbarium of South Australia. Retrieved 27 July 2017.