Drakaea glyptodon

Drakaea glyptodon, commonly known as king in his carriage[2] is a species of orchid endemic to the south–west of Western Australia. It is pollinated by a single species of male thynnid wasp using sexual deception. The orchid's labellum is similar in shape and scent to a flightless female thynnid wasp. It is the most common drakaea and has the widest distribution.

Drakaea glyptodon
King in his carriage on Mt Lindesay, near Denmark
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Drakaea
Species:
D. glyptodon
Binomial name
Drakaea glyptodon

Description

Drakaea glyptodon is similar to others in the genus in that it has a single, ground hugging leaf and an underground tuber. In this case, the leaf is heart shaped, about 10 millimetres (0.4 in) in diameter, glabrous, dull blue-grey with darker lines radiating from the attachment to the stem. The stem is 10–35 centimetres (4–10 in) long and the stalk of the single flower is 8–15 millimetres (0.3–0.6 in) long.[3]

Its flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp, except that the labellum is shorter and more swollen than those of other drakaeas. The flowers are pollinated by the wasp Zaspilothynnus trilobatus. King in his carriage can be distinguished by lacking a spine on the column. The flowers of Drakaea elastica and Drakaea concolor also lack a spine, but the species can be distinguished by having a glossy, dark green leaf (D. concolor) or having a glossy, light green leaf (D. elastica). The sepal at the back of the flower is 8–10 millimetres (0.3–0.4 in) long and the two at the sides are 7–9 millimetres (0.3–0.4 in). The petals are also 7–9 millimetres (0.3–0.4 in) long. The insect-like labellum has a "head" about one-third long as the "body", has only a few hairs and is covered with dark lumps. The rest of the labellum (representing the female "body" of the insect) is dark maroon in colour, hairy on the upper two-thirds and glabrous on the lower part. Flowers appear from late August to late October.[3]

Taxonomy and naming

Drakaea glyptodon was first formally described by Robert D. FitzGerald in 1882 in The Gardeners' Chronicle.[2][4] The specific epithet (glyptodon) refers to "an extinct South American animal related to the Armadillo".[5] "The whole lip [labellum] resembles in form (miniature, of course) the enormous extinct tortoise-monster, glyptodon, a creature as large as an ox and covered with tesselated scales."[6]

Distribution and habitat

King in his carriage occurs from near the Eneabba district to Condingup east of Esperance.[3] It grows in sand or gravelly soils near swamps that fill in winter.[7][8]

Conservation

Drakaea glyptodon is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[8]

References
  1. "Drakaea glyptodon". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. "Drakaea glyptodon". APNI. Retrieved 12 November 2015.
  3. Hopper, Stephen D.; Brown, Andrew P. (2007). "A revision of Australia' s hammer orchids (Drakaea: Orchidaceae), with some field data on species-specific sexually deceived wasp pollinators". Australian Systematic Botany. 20 (3): 268–271. doi:10.1071/SB06033.
  4. Fitzgerald, Robert D. (1882). "New Australian Orchids". The Gardeners' Chronicle. 17: 494. Retrieved 12 November 2015.
  5. Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. p. 238. ISBN 9780980296457.
  6. Pelloe, Emily H. (1930). West Australian Orchids. Perth: Dix Limited. p. 31. Retrieved 17 November 2015.
  7. Paczkowska, Grazyna; Chapman, Alex R. (2000). The Western Australian flora : a descriptive catalogue. Perth: Wildflower Society of Western Australia. p. 85. ISBN 0646402439.
  8. "Drakaea glyptodon". FloraBase. Western Australian Government Department of Parks and Wildlife.
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