Caleana brockmanii

Caleana brockmanii, commonly known as Brockman's duck orchid[3] is a species of orchid endemic to the south-west of Western Australia. It has a single smooth leaf, a single greenish yellow and red flower and is distinguished by its flat labellum, relatively late flowering period and calli only near the tip of the labellum. It is found south from Perth.

Brockman's duck orchid
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Caleana
Species:
C. brockmanii
Binomial name
Caleana brockmanii
Synonyms[2]

Description

Caleana brockmanii has a single smooth, dull green or dull red leaf, 15–30 mm (0.6–1 in) long and 3–6 mm (0.1–0.2 in) wide. The leaf is usually withered by flowering time. Usually only one greenish-yellow and red flower, 25–30 mm (0.98–1.2 in) long and 10–12 mm (0.4–0.5 in) wide is borne on a thin, wiry stalk 60–120 mm (2–5 in) high. The dorsal sepal, lateral sepals and petals are narrow and hang downwards with the dorsal sepal pressed against the column which has broad wings, forming a bucket-like shape. About one-third of the outer part of the labellum is covered with glossy black glands or calli and the labellum has a flattened top. Flowering occurs from late October to January.[3][4]

Taxonomy and naming

Brockman's duck orchid was first formally described in 2006 by Stephen Hopper and Andrew Brown who gave it the name Paracaleana brockmanii. The description was published in Australian Systematic Botany.[5] In 2014, based on molecular studies, Joseph Miller and Mark Clements transferred all the species previously in Paracaleana to Caleana so that the present species became Caleana brockmanii.[1][6] The specific epithet (brockmanii) honours the amateur orchidologist, Garry Brockman who collected the type specimen.[4]

Distribution and habitat

Caleana brockmanii grows in forest between Perth and Albany in the Jarrah Forest and Warren biogeographic regions.[3][4][7]

Conservation

Caleana brockmanii (as Paracaleana brockmanii) is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[7]

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References
  1. "Caleana brockmanii". APNI. Retrieved 14 April 2018.
  2. "Caleana brockmanii". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  3. Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 253. ISBN 9780646562322.
  4. Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. p. 300. ISBN 9780980296457.
  5. "Paracaleana brockmanii". APNI. Retrieved 14 April 2018.
  6. Miller, Joseph T.; Clements, Mark A. (2014). "Molecular phylogenetic analyses of Drakaeinae: Diurideae (Orchidaceae) based on DNA sequences of the internal transcribed spacer region". Australian Systematic Botany. 27 (1): 3–22. doi:10.1071/SB13036. Retrieved 13 April 2018.
  7. "Paracaleana brockmanii". FloraBase. Western Australian Government Department of Parks and Wildlife.
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