Taxonomy
Scientific Name
Pelargonium aestivale E.M.Marais
Higher Classification
Dicotyledons
Family
GERANIACEAE
National Status
Status and Criteria
Data Deficient - Insufficient Information
Assessment Date
2019/11/10
Assessor(s)
D. Raimondo
Justification
An endemic species to the central and eastern Karoo (historic extent of occurrence 42 909 km²). It was mostly collected from the eastern Karoo from an area of 2478 km² with only one record collected from the Hanover area. This species is recorded from 14 historic collections made prior to 1984 but has not been recently recorded despite to large survey efforts within its range over the past 10 years. It may be sensitive to the impacts of livestock gazing and have declined significantly. It is not possible to determine the degree of population decline which could range from 20 - 80% over the past three generations (generation length 20 years). It is therefore listed as Data Deficient.
Distribution
Endemism
South African endemic
Provincial distribution
Eastern Cape, Northern Cape, Western Cape
Range
Widespread in the summer rainfall areas of the central Karoo, from Carnarvon to Klaarstroom and Middelburg.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Nama Karoo
Description
Grassy karroid shrubland wedged between rocks on hillsides or flats. This is a geophytic species of pelargonium.
Threats
There have been few recent collections of this species indicating that it may have declined due to habitat degradation as a result of livestock overgrazing.
Population

Recorded from 14 historically collections all made prior to 1984, and cited in the literature as being locally common in the Karoo. However, this species has not been recently recorded despite two large survey efforts taking place within its range (the Karoo BioGaps Project run between 2016 and 2018, and the Greater Escarpment Biodiversity Survey run between 2005 and 2010). With no recent records it is extremely difficult to determine how many subpopulations are extant for this species.


Population trend
Stable
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Pelargonium aestivale E.M.MaraisLeast Concern Raimondo et al. (2009)
Bibliography

Magee, A.R. and Boatwright, J.S. (eds). In prep. Plants of the Karoo: A Conspectus of the Nama-Karoo and Adjacent Summer-Rainfall Regions of the Northern and Western Cape Provinces. Strelitzia.


Marais, E.M. 1994. Taxonomic studies in Pelargonium, section Hoarea (Geraniaceae). Unpublished Ph.D. Thesis, University of Stellenbosch, Stellenbosch.


Marais, E.M. 1995. Four species of Pelargonium, section Hoarea (Geraniaceae) and their possible relationships. South African Journal of Botany 61(2):90-100.


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
Raimondo, D. 2019. Pelargonium aestivale E.M.Marais. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2020/07/10

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