Thelymitra alcockiae

Thelymitra alcockiae, commonly called Kath's sun orchid,[2] is a species of orchid that is endemic to southern continental Australia. It has a single long, narrow leaf and up to twelve pale blue to deep purplish blue flowers, mauve or reddish on their back side.

Kath's sun orchid
Thelymitra alcockiae growing in western Victoria
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Thelymitra
Species:
T. alcockiae
Binomial name
Thelymitra alcockiae
D.L.Jones ex Jeanes[1]

Description

Thelymitra alcockiae is a tuberous, perennial herb with a single fleshy, channelled, linear to lance-shaped leaf 80–300 mm (3–10 in) long, 5–10 mm (0.2–0.4 in) wide. Between two and twelve pale blue to deep purplish blue, rarely white flowers 15–30 mm (0.6–1 in) wide are arranged on a flowering stem 100–600 mm (4–20 in) tall. The sepals and petals are 10–16 mm (0.4–0.6 in) long, 4–8 mm (0.2–0.3 in) wide and mauve or reddish on the reverse side. The column is pale blue or pinkish, 4–6.5 mm (0.16–0.26 in) long and about 2 mm (0.08 in) wide. The lobe on the top of the anther is brown with a yellow tip, tubular and sharply curved with an inflated tip. The side lobes have dense, mop-like tufts of white hairs. Flowering occurs from August to October.[2][3][4]

Taxonomy and naming

Thelymitra alcockiae was first formally described in 2013 by Jeff Jeanes after an unpublished description by David Jones. The formal description was published in Muelleria from a specimen collected near Naracoorte.[5] The specific epithet (alcockiae) honours "Kath Alcock (1925-), botanical artist and field naturalist".[3]

Distribution and habitat

Kath's sun orchid usually grows in drier habitats including shrubland, open forest and woodland. It is locally common in the north-west of Victoria and in South Australia.[2][3]

References
  1. "Thelymitra alcockiae". 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. p. 229. ISBN 1877069124.
  3. Jeanes, Jeffrey A. (2013). "An overview of the Thelymitra nuda (Orchidaceae) complex in Australia including the description of six new species" (PDF). Muelleria. 31: 15–16. Retrieved 11 May 2018.
  4. Jeanes, Jeff; Stajsic, Val. "Thelymitra alcockiae". Royal Botanic Gardens Victoria. Retrieved 11 May 2018.
  5. "Thelymitra alcockiae". APNI. Retrieved 11 May 2018.
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