Caladenia × triangularis

Caladenia × triangularis, commonly known as the shy spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to three pale yellow flowers. A natural hybrid between flava and C. longicauda, it is a rare species found between Perth and Esperance.

Shy spider orchid
Caladenia × triangularis growing in Wandoo National Park
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Caladenia
Species:
C. × triangularis
Binomial name
Caladenia × triangularis

Description

Caladenia × triangularis is a terrestrial, perennial, deciduous, herb with an underground tuber and a single hairy leaf, 50–100 mm (2–4 in) long and 5–10 mm (0.2–0.4 in) wide. Up to three pale yellow flowers 50–70 mm (2–3 in) wide are borne on a spike 100–250 mm (4–10 in) tall. The petals and lateral sepals spread widely apart and the labellum is relatively small with a short fringe and four or more rows of calli along its mid-line. Flowering occurs from August to October.[2]

Taxonomy and naming

Caladeni × triangularis was first formally described 1827 by Richard Sanders Rogers from a specimen collected between Wagin and Narrogin. The description was published in Transactions and Proceedings of the Royal Society of South Australia.[3][4] The epithet (triangularis) refers to the shape of the labellum of this orchid.[2]

Distribution and habitat

The shy spider orchid grows in woodland and shrubland between Perth and Esperance in the Avon Wheatbelt and Jarrah Forest biogeographic regions.[2][5]

Conservation

Caladenia × triangularis is classified as "Priority Four" by the Government of Western Australia Department of Parks and Wildlife,[5] meaning that is rare or near threatened.[6]

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References
  1. "Caladenia x triangularis". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. p. 461. ISBN 9780980296457.
  3. "Caladenia x triangularis". APNI. Retrieved 16 October 2018.
  4. Rogers, Richard S. (1927). "Contributions to the Orchidaceous flora of Australia". Transactions and Proceedings of the Royal Society of South Australia. 51: 10–11. Retrieved 18 October 2018.
  5. "Caladenia x triangularis". FloraBase. Western Australian Government Department of Parks and Wildlife.
  6. "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 18 October 2018.
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