Oxalis dines

Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_onStatus_en_offStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA MAGNOLIOPSIDA GERANIALES OXALIDACEAE

Scientific Name: Oxalis dines
Species Authority: Ornduff

Assessment Information [top]

Red List Category & Criteria: Vulnerable B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2010
Date Assessed: 2006-11-17
Assessor/s: Raimondo, D., L. Dreyer, K. Oberlander & N. Helme
Reviewer/s: Victor, J.E.& Foden, W.
Justification:
The species is currently known from eight locations from Vanrhynsdorp to Clanwilliam and in Calvinia, Western Cape, South Africa. The subpopulations are isolated as they occur in seasonal pools, however very little is known about the species method of dispersal so the species is not identified as severely fragmented. There is an ongoing decline in habitat mainly due to trampling and grazing by livestock. The species has an extent of occurrence of 6,600 km2 and an area of occupancy of less than 200 km2 (as it is only found in small pools). It is listed as Vulnerable.

Geographic Range [top]

Range Description:Vanrhynsdorp to Clanwilliam and in Calvinia, Western Cape, South Africa.

Known localities:
1) Cape Province, Calvinia. ca. 42 km SE of Nieuwoudtville (Goldblatt, Snijman. 1983)
2) W Cape, Northern Bokkeveld Escarpment S of Perdekraal (Oliver 1983) - locally frequent aquatic near edges of pan, also seen by D.Raimondo Augst 2006 > 500 plants seen at this location
3) Cape, Vanrhynsdorp. Along boundary of farm Sandkraal and farm 256 at base of Mitsikamma (Snijman 1983) - growing in abundance in seasonal clay pool.
4) Cape, Calvinia. Bokkeveld escarpment (Tweevlei, Snijman 1980)
5) Van Rhynsdorp, Rd. To Mauwerskop south of Vanrhynsdorp third of way from Raskraal (Oliver 1974)
6) Calvinia. Lokenberg near Nieuwoudtville (Barker)
7) Clanwilliam Div. 4 miles west of Clanwilliam (Salter 1932)
8) Calvinia Dist. 2 miles north of summit of Botterkloof (Salter 1932). Refound by L. Dreyer and K. Oberlander 2006 July.
9) Clanwilliam Div. Doorn River (Schlechter 1897)
Countries:
Native:
South Africa
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: Seasonal pools are highly isolated from one another but it is unknown that if a sub population goes extinct whether it could be recolonised. Not much is known about the dispersal strategy of these aquatic oxalisis.

Estimated total population size: >10,000;
Estimated number of locations: six; < 20 subpopulations (eight localities in PRECIS. <20 suspected.)
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: Seasonal pools and pans in clay.
Systems: Freshwater

Threats [top]

Major Threat(s): Habitat threatened by heavy grazing and trampling of plants floating in shallow pools was observed by Helme at Vanrhysdorp subpopulation and by Raimondo at some Nieuwoudtivlle subpopulations. Agriculture (low to moderate threat) as some farmers plough up these seasonal pools. This occurred in Nieuwoudtville in 2005, but it is not general practice as crops do not grow well in seasonally inundated areas.

Conservation Actions [top]

Conservation Actions: Habitat and site management and protection is required. Also, legal measures to protect the species habitat should be put in place. Restoration of sites for increasing species suitable habitat is also recommended.

Bibliography [top]

Cook, C.D.K. 2004. Aquatic and wetland plants of southern Africa. Backhuys Publishers, Leiden, The Netherlands.

IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).

South African National Biodiversity Institute. 2007. PRE (National Herbarium, Pretoria) Computerised Information System.

Citation: Raimondo, D., L. Dreyer, K. Oberlander & N. Helme 2010. Oxalis dines. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 19 April 2014.
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