Dierama grandiflorum

Taxonomy
Scientific Name
Dierama grandiflorum G.J.Lewis
Higher Classification
Monocotyledons
Family
IRIDACEAE
National Status
Status and Criteria
Endangered B1ab(iii)
Assessment Date
2016/11/18
Assessor(s)
C. McMaster & L. von Staden
Justification
An Eastern Cape endemic (EOO 3444 km²), known from two confirmed locations and possibly still extant at a three other locations where it is known from historical records. It is declining due to ongoing habitat degradation.
Distribution
Endemism
South African endemic
Provincial distribution
Eastern Cape
Range
Graaff-Reinet and Somerset East.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Amathole Montane Grassland, Karoo Escarpment Grassland
Description
Grass slopes among rock outcrops.
Threats
This species is declining due to ongoing habitat degradation as a result of livestock overgrazing. It is possible that a number of subpopulations known from historical records are no locally extinct due to overgrazing, but surveys of these sites are required to confirm this.
Population

An extremely rare and localized endemic known from less than 10 collections. Recent observations of subpopulations on the Bosberg indicate that plants occur in small, sparsely scattered clumps of fewer than 100 plants (C. McMaster pers. obs.). More field surveys are needed to relocate subpopulations known from historical records, but local extinctions are difficult to confirm as plants occur in small, localized stands that are easily overlooked.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Dierama grandiflorum G.J.LewisRare 2011.1
Dierama grandiflorum G.J.LewisRare Raimondo et al. (2009)
Bibliography

Bredenkamp, C. In prep. Conspectus of the flora of the Eastern cape. Strelitzia.


Hilliard, O.M. and Burtt, B.L. 1991. Dierama: The hairbells of Africa. Acorn Books, Johannesburg and London.


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
McMaster, C. & von Staden, L. 2016. Dierama grandiflorum G.J.Lewis. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2017/04/30

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Distribution map

© C. McMaster


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