|
Scientific Name | Chasmanthe bicolor (Gasp.) N.E.Br. |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
Synonyms | Antholyza aethiopica L. var. bicolor (Gasp.) Baker, Antholyza aethiopica L. var. minor Lindl. t.1159 (1828) in part, excluding synonyms, Antholyza bicolor Gasp., Petamenes bicolor (Gasp. ex Ten.) E.Phillips |
National Status |
Status and Criteria | Vulnerable B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) |
Assessment Date | 2021/09/30 |
Assessor(s) | N.A. Helme & D. Raimondo |
Justification | This Western Cape endemic has a restricted distribution range, with an extent of occurrence (EOO) of 2 524 km² and an area of occupancy of 44 km². It is estimated to occur at between six and eight locations. it may be locally common at specific collection sites, however, Its habitat is very difficult to explore. It is inferred to be declining as a result of crop cultivation, dam construction and alien plant invasion. Therefore it is listed as Vulnerable under criterion B. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | This species is endemic to the Western Cape Province, where it occurs between McGregor and Swellendam. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Breede Shale Renosterveld, Eastern Ruens Shale Renosterveld, Breede Alluvium Renosterveld |
Description | Sheltered ravines and in open woodland near streams. |
Threats |
| About 69% of this species habitat has been irreversibly modified, with loss predominantly to crop cultivation. In addition this species is threatened by dam construction and competition from alien invasive plants. |
Population |
Population decline is inferred from ongoing habitat loss and degradation. Research into population trends and status would be beneficial to establish the population size, and to confirm and quantify any reduction in population.
|
Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Chasmanthe bicolor (Gasp.) N.E.Br. | VU B1ab(ii,iii,iv,v) | Raimondo et al. (2009) | | Chasmanthe bicolor (Gasp.) N.E.Br. | Indeterminate | Hilton-Taylor (1996) | | Chasmanthe bicolor (Gasp.) N.E.Br. | Uncertain | Hall et al. (1980) | |
Bibliography |
Duncan, G. 2002. Just holding on: spectacular geophytes in peril. Veld & Flora 88(4):142-147.
Goldblatt, P. and Manning, J.C. 2000. Cape Plants: A conspectus of the Cape Flora of South Africa. Strelitzia 9. National Botanical Institute, Cape Town.
Hall, A.V., De Winter, M., De Winter, B. and Van Oosterhout, S.A.M. 1980. Threatened plants of southern Africa. South African National Scienctific Programmes Report 45. CSIR, Pretoria.
Hilton-Taylor, C. 1996. Red data list of southern African plants. Strelitzia 4. South African National Botanical Institute, Pretoria.
Manning, J., Goldblatt, P. and Snijman, D. 2002. The color encyclopedia of Cape bulbs. Timber Press, Portland/Cambridge.
Manning, J.C. and Goldblatt, P. 2012. Plants of the Greater Cape Floristic Region 1: The Core Cape Flora. Strelitzia 29. South African National Biodiversity Institute, Pretoria.
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 |
| Helme, N.A. & Raimondo, D. 2021. Chasmanthe bicolor (Gasp.) N.E.Br. National Assessment: Red List of South African Plants version . Accessed on 2025/01/17 |
Comment on this assessment
