Taxonomy
Scientific Name
Thereianthus elandsmontanus Goldblatt & J.C.Manning
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Endangered D
Assessment Date
2014/04/30
Assessor(s)
L. von Staden
Justification
A rare species, known from a single subpopulation of a few dozen mature individuals, which is not threatened. It is possible that other subpopulations may exist, that could be potentially threatened by habitat degradation, predominantly due to a lack of fire.
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Foot of the Elandskloof Mountains near Hermon.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Swartland Shale Renosterveld
Description
Low sandstone ridges.
Threats
This species was only recently (2011) discovered, after a controlled burn of a small fragment of lowland fynbos between crop fields. The majority of this private property is formally protected through a biodiversity stewardship contract, and although the population is within a agricultural production area outside the boundaries of the protected area, it is being managed for conservation. It is possible that other subpopulations exist within the area, which is extensively cultivated, but overlooked, because small fragments are seldom burnt and this species requires fire to flower. Due to its specific habitat requirements, rocky ridges, which is unsuitable to cultivation, it is unlikely to be declining due to habitat loss to agricultural expansion. It is however potentially threatened by habitat degradation due to a lack of fire, competition from alien invasive plants, loss of pollinators, and herbicide and pesticide drift from surrounding crop fields.
Population

Currently only one small subpopulation of a few dozen individuals is known (Manning and Goldblatt 2011), which is not threatened. As it flowers only sporadically, it is likely to be overlooked and may be more widespread along the western foothills of the Elandskloof and surrounding mountain ranges.


Population trend
Stable
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Thereianthus elandsmontanus Goldblatt & J.C.ManningEN D2014.1
Bibliography

Manning, J.C. and Goldblatt, P. 2011. Taxonomic revision of the genus Thereianthus (Iridaceae: Crocoideae). Bothalia 41(2):239-267.


Citation
von Staden, L. 2014. Thereianthus elandsmontanus Goldblatt & J.C.Manning. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2021/09/21

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Distribution map

© J.C. Manning


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