Hydnora visseri

Taxonomy
Scientific Name
Hydnora visseri Bolin, E.Maass & Musselman
Higher Classification
Dicotyledons
Family
HYDNORACEAE
National Status
Status and Criteria
Least Concern
Assessment Date
2014/05/11
Assessor(s)
D. Raimondo
Justification
This parasite is relatively widespread and common in vast areas of southern Namibia and the Richtersveld of South Africa. As a holoparasite, H. visseri has an obligate relationship with its hosts E. gregaria and E. gummifera. Thus its survival is dependant on robust host populations. Neither host plant is declining. Based on those factors and its presence in numerous protected areas including the Ai-Ais/Richtersveld Transfrontier Park (South Africa and Namibia), Sperrgebiet National Park (Namibia), the private ecological preserve Gondwana Canyon Park (Namibia), and its persistence on farms, it is unlikely that H. visseri is under threat of extirpation under current land use practises.
Distribution
Endemism
Not endemic to South Africa
Provincial distribution
Northern Cape
Range
Karas Region of Namibia and the Northern Cape Province of South Africa. This species' distribution follows that of its obligate hosts E. gregaria and E. gummifera in winter and transitional rainfall (summer-winter) areas of Namibia and South Africa on both sides of the Orange River.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Succulent Karoo
Description
Where E. gregaria and E. gummifera (the host plants of this species) occur they often form the dominant vegetation component of the Nama-Karoo and succulent Karoo vegetation types. Habitat is usually flat with sandy soils but occasionally H. visseri occurs in rocky soil types in rolling terrain.
Threats
Despite intensive land use for grazing in southern Namibia and northern South Africa the abundance of H. visseri does not appear to suffer as their obligate hosts are not palatable and are not browsed by domestic animals. The type locality, Farm Namuskluft may be under development pressure in the future due to its proximity to mining activities near Rosh Pinah, a prominent hub of mining activity in southern Namibia.
Population
Population trend
Stable
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Hydnora visseri Bolin, E.Maass & MusselmanLeast Concern 2014.1
Bibliography

Bolin, J.F., Maass, E. and Musselman, L.J. 2011. A new species of Hydnora (Hydnoraceae) from Southern Africa. Systematic Botany 36(2):255-260.


Citation
Raimondo, D. 2014. Hydnora visseri Bolin, E.Maass & Musselman. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2018/11/19

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Distribution map


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