Moraea teretifolia

Taxonomy
Scientific Name
Moraea teretifolia Goldblatt & J.C.Manning
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Vulnerable D2
Assessment Date
2016/11/01
Assessor(s)
L. von Staden
Justification
A highly localized (EOO <100 km²), but locally common species known from two locations. It is potentially threatened by habitat loss to mining and erosion.
Distribution
Endemism
South African endemic
Provincial distribution
Northern Cape
Range
Richtersveld, Ploegberg and Cornellskop.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Western Gariep Lowland Desert, Goariep Mountain Succulent Shrubland, Upper Annisvlakte Succulent Shrubland
Description
Open sandy, stony ground.
Threats
The most severe threat to plant species in the Richtersveld is severe overgrazing of communal rangelands, which has led to a loss of plant species diversity and shrub cover across large areas of the Richtersveld. Both known subpopulations occur in severely overgrazed areas. At one site, there has been a near-complete loss of shrub cover. However, in spite of such severe habitat degradation, the subpopulations appear to suffer no ill effect. Many Moraea species are unpalatable and/or poisonous to livestock, and can thrive under conditions of severe overgrazing. Widespread loss of vegetation cover has the additional effect of exposing soil to erosion, and in overgrazed areas, flash floods occur more frequently and cause increasing damage during periods of heavy rainfall (P.C.V. van Wyk pers. obs.). Moraea teretifolia is therefore potentially threatened by habitat loss to erosion. Areas to the north of the population is extensively degraded due to open-cast mining, and pile-ups of windblown sand from exposed mine dumps are burying dwarf species such as this one. Expansion of mining is another potential threat which could lead to habitat loss and degradation for this highly localized species.
Population

This species is common around the base and lower slopes of the Ploegberg (P.C.V. van Wyk pers. obs.), and another smaller subpopulation occurs at the base of Cornellskop. As it is abundant even in severely overgrazed areas, the population is not suspected to be declining. This species was only recently separated from the widespread and common Moraea saxicola (Goldblatt and Manning 2014), and it is possible that it may be overlooked elsewhere in the Richtersveld due to misidentifications.


Population trend
Stable
Bibliography

Goldblatt, P. and Manning, J.C. 2014. Taxonomy of the Moraea saxicola complex (Iridaceae: Iridoideae) of arid, western southern Africa, with the new species, M. acocksii, M. geminifolia, M. quartzicola and M. teretifolia. South African Journal of Botany 91:75-83.


Citation
von Staden, L. 2016. Moraea teretifolia Goldblatt & J.C.Manning. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/12/13

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Distribution map

© L. von Staden

© L. von Staden


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