Thelymitra jacksonii

Thelymitra jacksonii, commonly called the Jackson's sun orchid,[2] is a species of orchid in the family Orchidaceae and endemic to the south-west of Western Australia. It has a single erect, flat, leathery leaf and up to twelve dark golden brown flowers with yellow streaks and blotches. The column has broad, spreading wings with a wide fringe.

Jackson's sun orchid

Priority Three — Poorly Known Taxa (DEC)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Thelymitra
Species:
T. jacksonii
Binomial name
Thelymitra jacksonii
Jeanes[1]

Description

Thelymitra jacksonii is a tuberous, perennial herb with a single erect, flat, leathery, lance-shaped to egg-shaped leaf 50–150 mm (2–6 in) long and 20–40 mm (0.8–2 in) wide. Up to twelve dark golden brown flowers with yellow streaks and blotches, 25–50 mm (1–2 in) wide are borne on a flowering stem 150–250 mm (6–10 in) tall. The sepals and petals are 12–25 mm (0.5–1 in) long and 6–8 mm (0.2–0.3 in) wide. The column is golden brown near its base, orange near the tip, 6–8 mm (0.2–0.3 in) long and 3–4 mm (0.1–0.2 in) wide. The column has broad, spreading, deeply fringed wings. The lobe on the top of the anther has a tip resembling a mudskipper. The flowers are scented, insect pollinated and open on hot days. Flowering occurs from December to January.[2][3][4][5]

Taxonomy and naming

Thelymitra jacksonii was first formally described in 2006 by Jeff Jeanes after an unpublished description by Stephen Hopper and Andrew Brown. The description was published in Muelleria from a specimen collected near Walpole.[6] The specific epithet (jacksonii) honours William ("Bill") Jackson, the discoverer of the species.[5]

Distribution and habitat

Jackson's sun orchid grows with shrubs around winter-wet flats near Walpole in the Jarrah Forest and Warren biogeographic regions.[2][3][7]

Conservation

Thelymitra jacksonii is classified as "Priority Three" by the Government of Western Australia Department of Parks and Wildlife[7] meaning that it is poorly known and known from only a few locations but is not under imminent threat.[8]

References
  1. "Thelymitra jacksonii". 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. 252. ISBN 1877069124.
  3. Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. p. 419. ISBN 9780980296457.
  4. Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 292. ISBN 9780646562322.
  5. Jeanes, Jeffrey A. (2006). "Resolution of the Thelymitra fuscolutea R. Br. (Orchidaceae) complex of southern Australia" (PDF). Muelleria. 24: 14–15. Retrieved 6 June 2018.
  6. "Thelymitra jacksonii". APNI. Retrieved 6 June 2018.
  7. "Thelymitra jacksonii". FloraBase. Western Australian Government Department of Parks and Wildlife.
  8. "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 6 June 2018.
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