Thelymitra alpicola

Alpine striped sun orchid
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Subtribe: Thelymitrinae
Genus: Thelymitra
Species: T. alpicola
Binomial name
Thelymitra alpicola
Jeanes[1]

Thelymitra alpicola, commonly called the alpine striped sun orchid,[2] is a species of orchid that is endemic to eastern Australia. It has a single erect, dark green grass-like leaf and up to six relatively large, deep purplish blue flowers with darker streaks. It grows in subalpine to montane habitats.

Description

Thelymitra alpicola is a tuberous, perennial herb with a single erect, channelled, dark green linear to lance-shaped leaf 100–250 mm (4–10 in) long and 4–13 mm (0.2–0.5 in) wide, folded lengthwise with a purplish base. Up to six deep purplish blue flowers with darker veins, 20–30 mm (0.8–1 in) wide are arranged on a flowering stem 150–500 mm (6–20 in) tall. The sepals and petals are 8–14 mm (0.3–0.6 in) long and 3–8 mm (0.1–0.3 in) wide. The column is white or pale blue, 5–6 mm (0.20–0.24 in) long and 2.5–4 mm (0.1–0.2 in) wide with a brown collar. The lobe on the top of the anther is short and yellow with a lumpy back. The side lobes are parallel and yellow. The flowers are insect pollinated and open on hot days. Flowering occurs from October to January.[2][3]

Taxonomy and naming

Thelymitra alpicola was first formally described in 2012 by Jeff Jeanes from a specimen collected near Wulgulmerang and the description was published in Muelleria .[4] The specific epithet (alpicola) is derived from the Latin words alpinus meaning "of high mountains"[5]:536 and -cola meaning "dweller",[5]:217 referring to the usual habitat of this species.[3][6][7]

Distribution and habitat

The alpine striped sun orchid grows moist places near swamps in subalpine and montane habitats in New South Wales south from the Blue Mountains and in north-eastern Victoria with a disjunct population in the Strzelecki Ranges.[2][3][6][7][8]

Conservation

Thelymitra alpicola is listed as "vulnerable" in Victoria and New South Wales. The main threats to the species are trampling bu feral horses, forestry activities, road maintenance and competition in the absence of fire.[6][8]

References

  1. ↑ "Thelymitra alpicola". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. 1 2 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. 249. ISBN 1877069124.
  3. 1 2 3 Jeanes, Jeffrey A. (2000). "Two new rare species in the Thelymitra venosa complex (Orchidaceae) from south-eastern mainland Australia" (PDF). Muelleria. 30 (1): 18–20. Retrieved 1 June 2018.
  4. ↑ "Thelymitra alpicola". APNI. Retrieved 1 June 2018.
  5. 1 2 Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press.
  6. 1 2 3 Jeanes, Jeff; Stajsic, Val. "Thelymitra alpicola". Royal botanic Gardens Victoria. Retrieved 1 June 2018.
  7. 1 2 Murray, Louisa. "Thelymitra alpicola". Royal Botanic Garden Sydney. Retrieved 1 June 2018.
  8. 1 2 "Thelymitra alpicola - profile". New South Wales Government Office of Environment and Heritage. Retrieved 1 June 2018.
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