Thelymitra improcera

Thelymitra improcera, commonly called the coastal sun orchid,[2] is a species of orchid that is endemic to south-eastern Australia. It has a single erect, fleshy leaf and up to eight relatively small pale to bright blue flowers on a short flowering stem. The lobe on top of the anther is unusually short and lobed.

Coastal sun orchid
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Thelymitra
Species:
T. improcera
Binomial name
Thelymitra improcera

Description

Thelymitra sparsa is a tuberous, perennial herb with a single erect, fleshy, channelled, linear to lance-shaped leaf 100–200 mm (4–8 in) long and 8–10 mm (0.3–0.4 in) wide. Up to eight pale to bright blue flowers 20–25 mm (0.8–1 in) wide are arranged on a flowering stem 150–250 mm (6–10 in) tall. The sepals and petals are 12–15 mm (0.5–0.6 in) long and 5–8 mm (0.2–0.3 in) wide, with the labellum (the lowest petal) narrower. The column is white or bluish with a yellow tip, 5–6 mm (0.20–0.24 in) long and about 2.5 mm (0.1 in) wide. The lobe on the top of the anther is short with a yellow tip and small glands on the back. The side lobes have a long, mop-like tufts of white hairs. Flowering occurs from October to December but the flowers are self-pollinated and open only slowly on hot days.[2][3][4]

Taxonomy and naming

Thelymitra improcera was first formally described in 1999 by David Jones from a specimen collected on King Island and the description was published in Australian Orchid Research.[5] The specific epithet (improcera) is a Latin word meaning “short" or "undersized",[6] referring to this species' flower size compared to T. media.[3][4]

Distribution and habitat

The coastal sun orchid mostly grows in low-lying, moist heath and is found on King Island and in the far south-east of Victoria.[2][3][4]

References
  1. "Thelymitra improcera". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. pp. 242–243. ISBN 1877069124.
  3. Jones, David L. (1998). "Contributions to Tasmanian Orchidology". Australian Orchid Research. 3: 187–188.
  4. Jeanes, Jeff; Stajsic, Val. "Thelymitra procera". Royal Botanic Gardens Victoria. Retrieved 26 May 2018.
  5. "Thelymitra improcera". APNI. Retrieved 26 May 2018.
  6. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 708.
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