Caleana lyonsii

Caleana lyonsii, commonly known as the midget duck orchid[3] is a species of orchid endemic to the south-west of Western Australia. It is distinguished by its single smooth narrow leaf which is usually withered by flowering time and its up to ten small, greenish flowers. It grows in harsh environments in disjunct populations between Kalbarri and Southern Cross and has the smallest flowers of its genus in Western Australia.

Midget duck orchid
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Caleana
Species:
C. lyonsii
Binomial name
Caleana lyonsii
Synonyms[2]

Description

Caleana lyonsii has a single leaf, 4–10 mm (0.2–0.4 in) long, 4–8 mm (0.2–0.3 in) wide and which is usually withered at flowering time. Up to ten greenish-yellow flowers, 12–15 mm (0.5–0.6 in) long and 4–5 mm (0.16–0.20 in) wide are borne on a thin, wiry stalk 60–200 mm (2–8 in) high. The dorsal sepal and petals are narrow and hang downwards with the dorsal sepal pressed against the column which has broad wings, forming a bucket-like shape. The lateral sepals are also narrow but bend outwards. The entire upper surface of the labellum is covered with glands or calli and those nearer the tip are darker. Flowering occurs from late September to November.[3][4]

Taxonomy and naming

The midget duck orchid was first formally described in 2006 by Stephen Hopper and Andrew Brown who gave it the name Paracaleana lyonsii. 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 lyonsii.[1][6] The specific epithet (lyonsii) honours Mike Lyons, who discovered the species in 1994.[3][4]

Distribution and habitat

Caleana lyonsii grows in harsh environments including a sand ridge near Paynes Find. It occurs in disjunct populations north of Kalbarri, near Koolyanobbing and near Southern Cross in the Coolgardie, Geraldton Sandplains and Yalgoo biogeographic regions.[3][4][7]

Conservation

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

References
  1. "Caleana lyonsii". APNI. Retrieved 25 April 2018.
  2. "Caleana lyonsii". 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. 247. ISBN 9780646562322.
  4. Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. pp. 296–97. ISBN 9780980296457.
  5. "Paracaleana lyonsii". APNI. Retrieved 25 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 16 April 2018.
  7. "Paracaleana lyonsii". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
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