Thereianthus is a small genus of cormous plants from the southwestern Cape of South Africa in the Iridaceae family. They are unusual for a winter rainfall climate as they bloom in the dry warm summer months. Flowers are blue, purple, or white. It is related to Micranthus but lacks the membraneous bracts and two-ranked spikes of that genus.
Thereianthus bracteolatus is found on dry sandstone slopes in the north and southwest Cape. It has blue, purple or rarely white flowers. Photo taken by Rachel Saunders January 2007 at Silvermine where it is growing in very acidic and nutrient poor soils.
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