Ghostly beard orchid
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Calochilus
Species:
C. holtzei
Binomial name
Calochilus holtzei

Calochilus holtzei, commonly known as the ghostly beard orchid,[2] is a species of orchid endemic to northwestern Australia. It has a single leaf and up to twenty pale green to yellowish flowers with red markings and a labellum with a greenish "beard".

Description

Calochilus holtzei is a terrestrial, perennial, deciduous, herb with an underground tuber and a single leaf which is fully developed at flowering time, 300–550 mm (10–20 in) long, 10–20 mm (0.4–0.8 in) wide and triangular in cross section. Between eight and twenty pale green to yellowish flowers with red markings, 20–23 mm (0.8–0.9 in) long and 10–15 mm (0.4–0.6 in) wide are borne on a flowering stem 500–900 mm (20–40 in) tall. The dorsal sepal is 7–9 mm (0.3–0.4 in) long and 5–7 mm (0.20–0.28 in) wide. The lateral sepals are a similar length but narrower. The petals are 5–7 mm (0.20–0.28 in) long and about 4 mm (0.2 in) wide. The labellum curves downwards and is 14–17 mm (0.6–0.7 in) long and 9–12 mm (0.4–0.5 in) wide. The base of the labellum has purple calli and two purple plates. The middle section has bristly, greenish white hairs up to 5 mm (0.2 in) long and there is a narrow tip about 3 mm (0.1 in) long. Flowering occurs from December to March but each flower only lasts two or three days.[2]

Taxonomy and naming

Calochilus holtzei was first formally described in 1892 by Ferdinand von Mueller and the description was published in The Victorian Naturalist from specimens collected near Port Darwin by Maurice William Holtze.[3][4] The specific epithet (holtzei) honours the collector of the type specimen.[4]

Distribution and habitat

The ghostly beard orchid grows with grasses in forest and woodland in the northern Kimberley region of Western Australia and on Melville Island in the Northern Territory.[2][5]

References

  1. ↑ "Calochilus holtzei". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. 1 2 3 Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. pp. 264–265. ISBN 1877069124.
  3. ↑ "Calochilus holtzei". APNI. Retrieved 26 June 2018.
  4. 1 2 von Mueller, Ferdinand (1892). "Descriptions of new Australian plants, with occasional other annotations". The Victorian Naturalist. 8 (11): 180. Retrieved 2 July 2018.
  5. ↑ "Calochilus holtzei". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
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