Sunday 19 May
Sea spider iris (Ferraria crispa)
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Sea spider iris fact file
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Sea spider iris description
The sea spider iris is distinctive for the unusual flowers it bears and the acrid scent of rotting flesh it emits. The brown or yellowish, speckled flowers measure around 30 millimetres across and the petals have crispy margins, hence the scientific name of this species, crispa (5). The leaves of the sea spider iris are sword-shaped and slightly fleshy (3) (5), and they partly cover the branched, straight or slightly twisted stem (6). A swollen stem base of the sea spider iris forms an underground storage organ, or corm, which stores food for the plant (3) (7).
- Also known as
- black flag.
- Height: 40 – 100 cm (3)
- Conservation International: Biodiversity Hotspots:
- Cape Floristic Region
- An area occupying about 90,000 square kilometres in South Africa that contains an incredibly high diversity of plant species (around 8,700 species), of which 68 percent are found no where else.
- A species or taxonomic group that is only found in one particular country or geographic area.
- The transfer of pollen grains from the stamen (male part of a flower) to the stigma (female part of a flower) of a flowering plant. This usually leads to fertilisation, the development of seeds and, eventually, a new plant.
- A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.
- Goldblatt, P. and Manning, J.C. (2006) Radiation of pollination systems in the Iridaceae of sub-Saharan Africa. Annals of Botany, 97(3): 317 - 344.
- Angiosperm Phylogeny Website (February, 2008)
- Goldblatt, P. and Manning, J. (2000) Cape Plants: A Conspectus of the Cape Flora of South Africa. National Botanical Institute of South Africa, Pretoria .
- Threatened Species Programme. (2007) Interim Red Data List of South African Plant Taxa. South African National Biodiversity Institute, Pretoria, South Africa. Available at:
- Paterson-Jones, C. and Manning, J. (2007) Ecoguide Fynbos. Briza Publications, Pretoria, South Africa.
- Renosterveld Trust (February, 2008)
- Allaby, M. (1998) Dictionary of Plant Sciences. Oxford University Press, Oxford.
- Donaldson, J., Anderson, B. and Von Hase, A. (2003) Field Notes. Renosterveld Information Sharing Session, Groote Post Farm, Darling.
- Rouget, M., Richardson, D.M., Cowling, R.M., Lloyd, J.W. and Lombard, A.T. (2003) Current patterns of habitat transformation and future threats to biodiversity in terrestrial ecosystems of the Cape Floristic Region, South Africa. Biological Conservation, 112: 63 - 85.
- Conservation International: Biodiversity Hotspots (February, 2008)
- UNEP-WCMC: Cape Floral Protected Areas of South Africa (February, 2008)
- Fauna and Flora International (February, 2008)
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Sea spider iris biology
The sea spider iris bears its pungent, peculiar flowers between August and October (3), but each flower lasts for just a single day (6). Little information is available regarding the biology of the sea spider iris, but it can be presumed to be similar to that of other Ferraria species. Ferraria species are known to be pollinated by dung, flesh and game flies, and also by bees and wasps. The dull, mottled patterning of the flowers, along with their unpleasant rotting flesh or fermenting fruit scent attract flies (1), who are duped into thinking this is a suitable place to lay eggs (8). The flies walk all over the flowers trying, and failing, to find a suitable place to lay their eggs (8), and leave dusted liberally with bright orange pollen. While the sea spider iris does not provide insects with a suitable place to lay eggs, pollinators are rewarded with sips of concentrated nectar (1).Top
Sea spider iris rangeTop
Sea spider iris habitat
The sea spider iris mainly inhabits coastal areas, where it grows on sandstone or granite rocks (3).Top
Sea spider iris statusTop
Sea spider iris threats
The subspecies F. c. nortieri is classified as Vulnerable (4), but at present there is no information available to indicate what specific threats this species faces. However, as it is restricted to the Cape Floristic Region, it is likely to be impacted by urban development, the encroachment of agriculture and the invasion of alien species, threats that are known to be affecting the region’s habitat and numerous endemic plant species (9) (10).Top
Sea spider iris conservation
Within the Cape Floristic Region there are a number of protected areas (11), and a number of conservation organisations are working to conserve the botanically rich habitat of the Cape Floristic Region. Conservation actions include purchasing land to protect it from the threats of encroaching agriculture and urban development (12), the removal of alien plants, and the establishment of new protected areas (10); measures which should benefit the vulnerable subspecies F. c. nortieri.Top
Find out more
For further information on the Cape Floristic Region and its conservation see:
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