Caladenia osmera

Species of orchid

Pungent spider orchid

Scientific classification
Kingdom:  | Plantae
Clade:  | Tracheophytes
Clade:  | Angiosperms
Clade:  | Monocots
Order:  | Asparagales
Family:  | Orchidaceae
Subfamily:  | Orchidoideae
Tribe:  | Diurideae
Genus:  | Caladenia
Species:  |

C. osmera

Binomial name
Caladenia osmera

(D.L.Jones) G.N.Backh.[1]

Synonyms[1]

Arachnorchis osmera D.L.Jones

Caladenia osmera is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. It is a ground orchid with a single leaf and one or two greenish-cream flowers with pink stripes and which has a sharp odour resembling burnt plastic.

## Description[edit]

Caladenia osmera is a terrestrial, perennial, deciduous, herb with an underground tuber and a single leaf, 60–120 mm (2–5 in) long and 5–10 mm (0.2–0.4 in) wide. One or two greenish-cream to cream-coloured flowers with pink stripes and blotches are borne on a spike 150–300 mm (6–10 in) tall. The flowers have a sharp odour resembling the smell of burnt plastic. The sepals and petals have narrow, dark red, club-like glandular tips 5–12 mm (0.2–0.5 in) long. The sepals and petals are 20–45 mm (0.8–2 in) long and 2–4 mm (0.08–0.2 in) wide with the petals shorter than the sepals. The sepals and petals spread widely and horizontally or curve downwards. The labellum is greenish-cream with a dark red tip and is 11–13 mm (0.4–0.5 in) long and 7–9 mm (0.28–0.35 in) wide. The sides of the labellum curve upwards and have linear teeth up to 25 mm (1 in) long, decreasing in size towards the tip. There are four or six rows of calli about 1 mm (0.04 in) long near the base of the labellum and tapering towards the tip. Flowering occurs in September and October.[2]

## Taxonomy and naming[edit]

This orchid was first formally described in 2006 by David Jones and given the name Arachnorchis osmera. The description was published in Australian Orchid Research.[3] In 2007 Gary Backhouse changed the name to Caladenia osmera.[1] The specific epithet (osmera) is derived from the Ancient Greek word osme meaning "smell" or "odour"[4] referring to the strong floral scent of this species.[5]

## Distribution and habitat[edit]

Caladenia osmera is only known from areas east of Bruthen where it grows in tall montane forest.[2] It probably also occurs on the Southern Tablelands of New South Wales.[6]

## Conservation[edit]

Caladenia osmera is listed as "vulnerable" under the Victorian Flora and Fauna Guarantee Act 1988.[2]

## References[edit]

1. ^ a b c "Caladenia osmera". APNI. Retrieved 27 February 2017.
2. ^ a b c Jeanes, Jeffrey. "Caladenia osmera". Royal Botanic Gardens Victoria: Vicflora. Retrieved 27 February 2017.
3. ^ "Arachnorchis osmera". APNI. Retrieved 27 February 2017.
4. ^ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 579.
5. ^ Jones, David L. (2006). "New taxa of Australian Orchidaceae". Australian Orchid Research. 5.
6. ^ "Caladenia osmera". Royal Botanic Gardens Sydney: plantnet. Retrieved 27 February 2017.

Taxon identifiers

Caladenia osmera|

* Wikidata: Q15287625
* Wikispecies: Caladenia osmera
* APNI: 206484
* CoL: PBW4
* EoL: 17059522
* GBIF: 2841676
* IPNI: 77080224-1
* NCBI: 1300963
* NSWFlora: Caladenia~osmera
* Open Tree of Life: 3970435
* Plant List: kew-346281
* POWO: urn:lsid:ipni.org:names:77080224-1
* Species+: 73798
* Tropicos: 100156473
* VicFlora: 1213182e-626b-438f-b625-ce7a29fd6bae
* WFO: wfo-0000808047

Arachnorchis osmera|

* Wikidata: Q65931027
* APNI: 199670
* CoL: 7RQT9
* GBIF: 2841677
* IPNI: 77079842-1
* POWO: urn:lsid:ipni.org:names:77079842-1
* Tropicos: 100149234
* VicFlora: ce78ef86-8ba7-4c4b-b958-bee37d177c07
* WFO: wfo-0000807755