|
Scientific Name | Thereianthus bulbiferus Goldblatt & J.C.Manning |
Higher Classification | Monocotyledons |
Family | IRIDACEAE |
National Status |
Status and Criteria | Endangered B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) |
Assessment Date | 2014/04/22 |
Assessor(s) | L. von Staden & D. Raimondo |
Justification | EOO 760 km², between one and three remaining locations continue to decline due to ongoing habitat loss, fragmentation and degradation. |
Distribution |
Endemism | South African endemic |
Provincial distribution | Western Cape |
Range | Piketberg to Gouda and Paarl. |
Habitat and Ecology |
Major system | Terrestrial |
Major habitats | Swartland Shale Renosterveld, Swartland Silcrete Renosterveld, Swartland Alluvium Fynbos |
Description | Seasonally wet alluvial flats. |
Threats |
| Less than 30% of alluvial fynbos remains intact after extensive loss to crop cultivation, as well as urban expansion. Loss continues, and remaining fragments continue to be degraded, and are often too infrequently burnt - this species relies on fire to flower. |
Population |
This range-restricted species is seldom collected, and the extent and size of the population is difficult to estimate, as this species flowers most prolifically after fire, and is very rare in the intervening time (Manning and Goldblatt 2011). There is currently only one known existing subpopulation, which is protected within a private nature reserve. Two other subpopulations were recorded with imprecise locality detail from areas now extensively modified for crop cultivation, and may be locally extinct. Due to its fire-stimulated flowering, it is likely to be overlooked, but with less than 30% of alluvial fynbos remaining within this species' known range, it is unlikely that many undiscovered subpopulations remain.
|
Population trend | Decreasing |
Assessment History |
Taxon assessed |
Status and Criteria |
Citation/Red List version | | Thereianthus bulbiferus Goldblatt & J.C.Manning | EN B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) | 2014.1 | |
Bibliography |
Manning, J.C. and Goldblatt, P. 2011. Taxonomic revision of the genus Thereianthus (Iridaceae: Crocoideae). Bothalia 41(2):239-267.
|
Citation |
| von Staden, L. & Raimondo, D. 2014. Thereianthus bulbiferus Goldblatt & J.C.Manning. National Assessment: Red List of South African Plants version . Accessed on 2025/06/15 |
Comment on this assessment
