Gladiolus filiformis

Taxonomy
Scientific Name
Gladiolus filiformis Goldblatt & J.C.Manning
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Near Threatened D2
Assessment Date
2016/09/30
Assessor(s)
N. Hahn & L. von Staden
Justification
A range-restricted (EOO 287 km²), but locally very abundant species that is not currently declining. An estimated four to ten locations are potentially threatened by habitat loss to mining and overgrazing.
Distribution
Endemism
Not endemic to South Africa
Provincial distribution
North West
Range
Makadima Mountains between Lobatse and Zeerust.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Carletonville Dolomite Grassland, Zeerust Thornveld
Description
Grassland and scrubland on hill slopes and plateaus.
Threats
Plants at the type locality are potentially threatened by overgrazing (herds of goats were observed in the area), as well as infrastructure development related to radio towers and pipelines (Hahn 2013, Hahn and Roux 2014) at two others. There is also a potential threat of habitat loss to mining.
Population

This species was known for 33 years from only the type collection, from a remote area of North West Province near the border with Botswana. It was thought to be a rare, localized endemic. Field surveys between 2010 and 2013 found the species to be locally abundant, with the population estimated to be well in excess of 100 000 mature individuals, and not declining. Field observations indicate that if flowers prolifically during years of good rainfall, but most of the population remains dormant during dry years, so that it appears to be rare.


Population trend
Stable
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Gladiolus filiformis Goldblatt & J.C.ManningCritically Rare Raimondo et al. (2009)
Bibliography

Goldblatt, P. and Manning, J.C. 1998. Gladiolus in southern Africa. Fernwood Press, Vlaeberg.


Hahn, N. 2013. Rare, endangered and endemic flora of the North West Province. Unpublished Report to the Department of Economic Development, Conservation and Tourism, North West Provincial Government.


Hahn, N. and Roux, H. 2014. Gladiolus filiformis, a poorly known species from North West Province, South Africa. Bothalia - African Biodiversity & Conservation 44(1):1-4.


Raimondo, D., von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. and Manyama, P.A. 2009. Red List of South African Plants. Strelitzia 25. South African National Biodiversity Institute, Pretoria.


Citation
Hahn, N. & von Staden, L. 2016. Gladiolus filiformis Goldblatt & J.C.Manning. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/06/25

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Distribution map


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