Senecio cadiscus
Senecio cadiscus is a species of aquatic flowering plant in the aster family, Asteraceae. It is endemic to the Western Cape of South Africa, where it grows in vernal pools. It was at one time classified as Cadiscus aquaticus, the only species in the monotypic genus Cadiscus, but molecular phylogenetic analysis showed that it is nested within Senecio. It is a floating or emergent plant with small narrow leaves and white-rayed flowers. Its populations are small and fragmented, and are declining. The plant is threatened by grazing and trampling by livestock, invasive plants, reclamation of wetlands and eutrophication from fertilizer runoff. The International Union for Conservation of Nature has consequently rated it as "critically endangered".
Taxonomy
This plant was known as Cadiscus aquaticus, the only species in the monotypic genus Cadiscus, until molecular phylogenetic analyses indicated it was clearly nested among the species of Senecio. It was moved there and renamed S. cadiscus in 2009. Some authorities still accept its former name.Description
This is an aquatic plant that grows in vernal pools. It is floating or emergent and sometimes terrestrial along the pool margins. Young plants are submerged. Flowering occurs in August and September.The plant has narrow, floating leaves and white ray florets. The fruit is a cypsela with a pappus of coarse bristles and small tufts of hairs that become sticky and slimy when wet. These may be adaptations to zoochory, in which seeds are dispersed by animals, perhaps waterfowl.