Taxonomy
Scientific Name
Oxygonum dregeanum Meisn. subsp. streyi Germish.
Higher Classification
Dicotyledons
Family
POLYGONACEAE
National Status
Status and Criteria
Endangered A2c
Assessment Date
2015/08/18
Assessor(s)
L. von Staden
Justification
A widespread taxon that is estimated to have declined by at least 50% within three generations, predominantly due to habitat loss to urban expansion and sugarcane cultivation. It continues to decline due to ongoing habitat loss and degradation.
Distribution
Endemism
Not endemic to South Africa
Provincial distribution
Eastern Cape, KwaZulu-Natal
Range
Southern Mozambique and the KwaZulu-Natal coast as far south as Port Edward.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Muzi Palm Veld and Wooded Grassland, Maputaland Pallid Sandy Bushveld, Zululand Lowveld, Tembe Sandy Bushveld, Pondoland-Ugu Sandstone Coastal Sourveld, KwaZulu-Natal Coastal Belt Grassland, Maputaland Wooded Grassland, Maputaland Coastal Belt
Description
Coastal grasslands and palm veld, sandy soils.
Threats
This taxon has already lost more than 60% of its habitat to urban expansion, coastal development, sugarcane and timber plantations. Few intact fragments remain, and these continue to be lost to development, spreading rural settlements, as well as degraded due to a lack of fire and spreading alien invasive plants.
Population

This taxon is a long-lived grassland forb, that regenerates after grassland fires from persistent underground rootstocks, and generation length is estimated to be at least 50 years. A population reduction of at least 50% is estimated based in more than 60% habitat loss over the past three generations. Historical records indicate that it formerly occurred all along the KwaZulu-Natal coast, but it now persists predominantly in a network of protected areas on the Maputaland coastal plain, with a few isolated occurrences on the KwaZulu-Natal South Coast.


Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Oxygonum dregeanum Meisn. subsp. streyi Germish.EN A2c2015.1
Oxygonum dregeanum Meisn. subsp. streyi Germish.Least Concern Raimondo et al. (2009)
Bibliography

Germishuizen, G. 1988. The Oxygonum dregeanum complex (Polygonaceae). Bothalia 18(2):173-188.


Nogueira, I., Ortiz, S. and Paiva, J.A.R. 2006. Polygonaceae. In: G.V. Pope, R.M. Polhill and E.S. Martins (eds). Flora Zambesiaca 9 (Part 3):1-49. Flora Zambesiaca Managing Committee, Royal Botanic Gardens, Kew.


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
von Staden, L. 2015. Oxygonum dregeanum Meisn. subsp. streyi Germish. National Assessment: Red List of South African Plants version 2020.1. Accessed on 2022/05/16

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Distribution map


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