About Geissorhiza radians (Thunb.) Goldblatt
Geissorhiza radians, commonly called the winecup flower, is a highly threatened species in the Iris family. Fewer than 10 of its remaining subpopulations grow in south-western Cape Town, South Africa, with smaller patches extending as far as Gordon's Bay. The species nearly always grows in seasonally moist lowland wetlands that dry out during the summer months. It produces deep purple flowers with large, dark red centres, and each individual plant bears between 1 and 6 flowers. These flowers grow in dense colonies, creating a spectacular floral display that begins in mid-September, especially around the town of Darling. The dark-centred flowers have evolved to attract specific pollinators from the horsefly family Tabanidae, though the exact nature of this ecological interaction still requires further research. More than 80% of the species' original seasonally wet lowland habitat has been permanently converted to agricultural land or urban development, leaving the remaining populations threatened by ongoing spread of invasive alien vegetation and runoff of agricultural fertilizers.
