Habenaria mossii 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Liliopsida Orchidales Orchidaceae

Scientific Name: Habenaria mossii (G.Will.) J.C.Manning

Assessment Information [top]

Red List Category & Criteria: Endangered C1+2a(i) ver 3.1
Year Published: 2003
Date Assessed: 2003-04-30
Needs updating
Assessor(s): Pfab, M.F. (Gauteng Nature Conservation) & Victor, J. (National Botanical Institute)
Reviewer(s): Golding, J. & Hilton-Taylor, C. (Southern African Plant Red List Authority)
This species has a very small population size (380 to 625 mature individuals from field observations). Generation length ranges from two to eight years, with a best estimate of five. There is estimated to be a 22% continuing decline over the next two generations (5–16 years), hence triggering the listing of Endangered under criterion C1. None of the subpopulations contains more than 250 mature individuals. The RAMAS® Red List software package was used to make this assessment.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is apparently endemic to the Gauteng Province of South Africa, although there are indications that it may formerly have occurred near Queenstown in the Eastern Cape Province (C. Archer, pers. comm.). The extent of occurrence is less than 2,600 km² and the area of occupancy <5 km². The species is known from seven locations and is not considered severely fragmented, hence does not qualify for listing as Critically Endangered under criterion B.

All seven known localities have been surveyed in recent years. The Uitkomst-Tweedsmere Ranch (Sterkfontein World Heritage Site) locality comprises 61-70 individuals; the Irene Koppie locality (which is currently being urbanized) still has 35-40 individuals, but these will disappear as the development grows; the
Thorntree Kloof, Johannesburg locality probably has 12-15 individuals based on an unconfirmed observation, in an urbanized area; the Waterval WNW of Krugersdorp locality could not be found and is presumed to be extinct; the Sterkfontein locality comprises 35-40 individuals in a relatively rural area; the Rietvlei Dam Nature Reserve locality also comprises 35-40 individuals and the Linksfield Ridge locality is assumed to comprise 12-15 individuals, based on an unconfirmed observation from this urban site.
Countries occurrence:
South Africa (Gauteng)
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:An erect herb rising from an ellipsoid tuber which grows in open grassland on dolomite or in black sandy soil.

Threats [top]

Major Threat(s): Expanding urbanization is the greatest threat. One of the sites is now an aerodrome.

Conservation Actions [top]

Conservation Actions: Occurs in the Tweedsmere Ranch Natural Heritage site and Nature Reserve. Also occurs in the Rietvlei Dam Municipal Nature Reserve and the Suikerbosrand Nature Reserve.

Citation: Pfab, M.F. (Gauteng Nature Conservation) & Victor, J. (National Botanical Institute). 2003. Habenaria mossii. The IUCN Red List of Threatened Species 2003: e.T39939A10293479. . Downloaded on 25 June 2018.
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