Caladenia nana

Pink fan orchid
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Caladenia
Species:
C. nana
Binomial name
Caladenia nana
Synonyms[1]

Caladeniastrum nanum (Endl.) Szlach.

Caladenia nana, commonly known as pink fan orchid,[2] is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It is a clump-forming ground orchid with a single linear leaf and up to 6 pale pink to rose pink flowers.

Description

Caladenia nana is a terrestrial, perennial, deciduous herb that forms clumps. It has a single linear to broadly linear leaf, 50–180 mm (2.0–7.1 in) long and 3–10 mm (0.12–0.39 in) wide with a reddish-purple blotches near the base. Up to 6 pale pink to rose pink flowers 10–40 mm (0.39–1.57 in) 10–40 mm (0.39–1.57 in) wide are borne on a spike 50–400 mm (2.0–15.7 in) tall. The sepals and petals are broadly lance-shaped with glandular hairs on the back. The dorsal sepal is erect and curves forward, 7–17 mm (0.28–0.67 in) long and 2–7 mm (0.079–0.276 in) wide. The lateral sepals are 8–20 mm (0.31–0.79 in) long and 3–7 mm (0.12–0.28 in) wide, the petals 7–17 mm (0.28–0.67 in) long and 3–6 mm (0.12–0.24 in) wide. The labellum is white with pink blotches and markings, and is 5–12 mm (0.20–0.47 in) long 7–12 mm (0.28–0.47 in) wide with three lobes. Flowering occurs from August to November.[3][4][5]

Taxonomy and naming

Caladenia nana was first formally described in 1846 by Stephan Endlicher in Lehmann's Plantae Preissianae from specimens collected on Mount Clarence in 1840.[6][7] The specific epithet (nana) means "dwarf".[3][8]

In 2001, Stephen Hopper and Andrew Phillip Brown described two subspecies of Caladenia nana in the journal Nuytsia and the names are accepted by the Australian Plant Census:

  • Caladenia nana R.Br. subsp. nana[9] - little pink fan orchid, grows to 50–150 mm (2.0–5.9 in) tall and flowers from late August to October, with lateral sepals 8–10 mm (0.31–0.39 in) long and 3–5 mm (0.12–0.20 in) wide.[5][10]
  • Caladenia nana subsp. unita Hopper & A.P.Br. [11] - pink fan orchid, grows to 150–400 mm (5.9–15.7 in) tall and flowers from October to November, with lateral sepals 11–19 mm (0.43–0.75 in) long and 5–7 mm (0.20–0.28 in) wide.[5][12]

Distribution and habitat

Caladenia nana grows in winter-wet flats and swamps in jarrah forest in the Avon Wheatbelt, Esperance Plains, Jarrah Forest, Swan Coastal Plain and Warren bioregions of south-western Western Australia.[2][3][4]

Conservation

Caladenia nana and both subspecies are classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[2][10][12]

References

  1. ^ a b "Caladenia nana". Australian Plant Census. Retrieved 8 February 2023.
  2. ^ a b c "Caladenia nana". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. ^ a b c Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. pp. 148–149. ISBN 9780980296457.
  4. ^ a b Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. pp. 172–173. ISBN 9780646562322.
  5. ^ a b c Brown, Andrew P.; Hopper, Stephen (2001). "Contributions to Western Australian orchidology: 2. New taxa and circumscriptions in Caladenia". Nuytsia. 14 (1/2): 178–183. Retrieved 8 February 2023.
  6. ^ "Caladenia nana". APNI. Retrieved 9 February 2023.
  7. ^ Endlicher, Stephan; Lehmann, Johann G.C. (1846). Plantae preissianae sive enumeratio plantarum quas in australasia occidentali et meridionali-occidentali annis 1838-1841 collegit Ludovicus Preiss. Vol. 2. Hamburg: Sumptibus Meissneri. p. 7. Retrieved 9 February 2023.
  8. ^ Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 259. ISBN 9780958034180.
  9. ^ "Caladenia nana subsp. nana". Australian Plant Census. Retrieved 9 February 2023.
  10. ^ a b "Caladenia nana subsp. nana". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  11. ^ "Caladenia nana subsp. unita". Australian Plant Census. Retrieved 9 February 2023.
  12. ^ a b "Caladenia nana subsp. unita". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.

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