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Scientific Name | Isoetes eludens J.P.Roux, Hopper & Rhian.J.Sm. |
Higher Classification | Ferns |
Family | ISOETACEAE |
National Status |
Status and Criteria | Vulnerable D1 |
Assessment Date | 2011/05/13 |
Assessor(s) | J.P. Roux & L. von Staden |
Justification | A recently discovered, highly localized habitat specialist currently known from one small subpopulation of about 300 plants. It occurs in a remote area and has no known threats. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Northern Cape |
Range | Kamiesberg. |
Habitat and Ecology |
Major system | Freshwater |
Major habitats | Namaqualand Granite Renosterveld |
Description | Shallow temporary pools in depressions on granite rocks. |
Threats |
| The only known subpopulation occurs in a remote area where there are no immediate threats. Land use in the Kamiesberg is largely stock farming, however this species occurs in unpalatable granite fynbos, and it is unlikely that livestock will be introduced to the site (Roux et al. 2009). |
Population |
The Kamiesberg, a known centre of endemism, has been surveyed for new species of Isoetes since 2001. Isoetes eludens was discovered in 2007, and is currently known from a single subpopulation of between 250 and 300 plants (Roux et al. 2009). Evidently a very rare species, there may however be a few undiscovered subpopulations, and further surveys are required.
The population is not suspected to be declining.
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Population trend | Stable |
Notes |
| Another population of Isoetes from the Calvinia district resembles I. eludens. The genus is under revision, and the distribution range of this species needs to be confirmed. |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Isoetes eludens J.P.Roux, Hopper & Rhian.J.Sm. | VU D1 | 2011.1 | |
Bibliography |
Roux, J., Hopper, S. and Smith, R. 2009. Isoetes eludens (Isoetaceae), a new endemic species from the Kamiesberg, Northern Cape, South Africa. Kew Bulletin 64(1):123-128.
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Citation |
| Roux, J.P. & von Staden, L. 2011. Isoetes eludens J.P.Roux, Hopper & Rhian.J.Sm. National Assessment: Red List of South African Plants version . Accessed on 2025/05/19 |
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