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Scientific Name | Pilularia bokkeveldensis N.R.Crouch |
Higher Classification | Ferns |
Family | MARSILEACEAE |
Synonyms | Pilularia americana in sense of Roux (2002), not of A.Braun (misapplied name) |
Common Names | Bokkeveld Pillwort (e) |
National Status |
Status and Criteria | Critically Endangered B1ab(iii)+2ab(iii) |
Assessment Date | 2013/07/24 |
Assessor(s) | L. von Staden |
Justification | Plants at a single known location are threatened by ongoing habitat loss and degradation as a result of expanding rooibos tea cultivation. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Northern Cape |
Range | Bokkeveld Escarpment near Nieuwoudtville. |
Habitat and Ecology |
Major system | Freshwater |
Major habitats | Bokkeveld Sandstone Fynbos |
Description | Muddy edge of seasonal pans in sandstone fynbos. |
Threats |
| The only known location is a farm extensively transformed for rooibos tea cultivation. This species was last recorded in 2001, and much of this habitat destruction has taken place since then, and this subpopulation may already have been lost. It is likely that this species may still be found elsewhere on the Nieuwoudtville Plateau, but it is likely to face similar threats across this area. |
Population |
This species is known from a single collection, made in 2001. It is very cryptic (resembling Isoetes) and easily overlooked. The Bokkeveld Escarpment around Nieuwoudtville is an area rich in endemic species, and it is likely that this species is endemic to this area.
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Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Pilularia americana A.Braun | Least Concern | Raimondo et al. (2009) | |
Bibliography |
Cook, C.D.K. 2004. Aquatic and wetland plants of southern Africa. Backhuys Publishers, Leiden, The Netherlands.
Crouch, N.R., Klopper, R.R., Burrows, J.E. and Burrows, S.M. 2011. Ferns of southern Africa: A comprehensive guide. Struik Nature, Cape Town.
Sieben, E.J.J. 2009. The status and distribution of vascular plants (Magnoliophyta, Lycophyta, Pteridophyta). In: W.R.T. Darwall, K.G. Smith, D. Tweddle and P. Skelton (eds.), The status and distribution of freshwater biodiversity in southern Africa (pp. 83-98), IUCN and SAIAB, Gland, Switzerland and Grahamstown, South Africa.
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Citation |
| von Staden, L. 2013. Pilularia bokkeveldensis N.R.Crouch. National Assessment: Red List of South African Plants version . Accessed on 2025/04/13 |
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