Caladenia anthracina

Black-tipped spider orchid
	Near Campbell Town
Conservation status
	; Critically endangered (EPBC Act)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Asparagales
Family:	Orchidaceae
Subfamily:	Orchidoideae
Tribe:	Diurideae
Genus:	Caladenia
Species:	C. anthracina
Binomial name
	Caladenia anthracina; D.L.Jones
Synonyms
	Arachnorchis anthracina (D.L.Jones) D.L.Jones & M.A.Clem.; Calonemorchis anthracina (D.L.Jones) Szlach.;

Caladenia anthracina, commonly known as black-tipped spider orchid,

Orchidaceae and is endemic to Tasmania. It is a ground orchid with a single hairy leaf and a single white or cream-coloured flower with red markings and black tips on the sepals and petals

.

Description

Caladenia anthracina is a terrestrial,

perennial, deciduous, herb with an underground tuber surrounded by a fibrous covering. A single hairy, dull green, lance-shaped leaf, 5–12 cm (2–5 in) long and 3–7 mm (0.1–0.3 in) wide appears above ground in May or June, following rain.^[2]^[3]

A single flower, 45–65 mm (2–3 in) in diameter is borne on a densely spike 10–20 cm (4–8 in) high. The

petals are 35–45 mm (1–2 in) long, 2–3 mm (0.08–0.1 in) wide and also taper to a black point. The labellum is a broadly egg-shaped when flattened and curves forward, 13–16 mm (0.5–0.6 in) long and 7–9 mm (0.3–0.4 in) wide and is strongly curved towards the tip. It is white to cream-coloured and there are four to six rows of dark reddish-purple calli along in the centre part and short, blunt teeth along the edge. The column is 13–15 mm (0.5–0.6 in) long and translucent with reddish markings and narrow wings. Flowering occurs between late September and early November.^[3]^[2]

Taxonomy and naming

The species was first formally described by David L. Jones in 1998 and the description was published in Australian Orchid Research from a specimen collected near Ross.^[4] The specific epithet (anthracina) is a Latin word meaning "coal-black"^[5] referring to the glands on the ends of the sepals and petals.^[3]

Distribution and habitat

Caladenia anthracina is only known from an area of 27 km² (10 sq mi) in the Midlands where it grows in grassy woodland in sandy soil.^[2]

Conservation

This species is classified as "Endangered" by the Tasmanian Government and is listed as "critically endangered" (CR) under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act).^[2]

References

^ ^a ^b "Caladenia anthracina". Australian Plant Census. Retrieved 22 November 2023.
^ ^a ^b ^c ^d ^e "Threatened species listing status - Black-tipped spider orchid" (PDF). Tasmanian Government Department of Primary Industries, Water and Environment. Retrieved 28 September 2016.
^ ^a ^b ^c Jones, David L. (1998). "Contributions to Tasmanian Orchidology (2)". Australian Orchid Research. 3: 21–22.
^ "Caladenia anthracina". APNI. Retrieved 28 September 2016.
^ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 148.

[APC-1] "Caladenia anthracina". Australian Plant Census. Retrieved 22 November 2023.

[dipwe-2] "Threatened species listing status - Black-tipped spider orchid" (PDF). Tasmanian Government Department of Primary Industries, Water and Environment. Retrieved 28 September 2016.

[Jones-3] Jones, David L. (1998). "Contributions to Tasmanian Orchidology (2)". Australian Orchid Research. 3: 21–22.

[APNI-4] "Caladenia anthracina". APNI. Retrieved 28 September 2016.

[RWB-5] Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 148.

[1]

[2]

[3]

[4]

[5]