Thereianthus montanus is a species of flowering plant in the family Iridaceae. It is a perennial geophyte and is part of the fynbos ecoregion.http://redlist.sanbi.org/species.php?species=1546-11 REDLIST Sanbi The species is endemic to the Western Cape and occurs in the Riviersonderend Mountains near Pilaarkop. The plant has a range of less than 14 km2 and there are two subpopulations. It grows on the southern slopes at altitudes of 1500 m and is threatened by invasive plants.https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77065324-1 Plants of the World Online
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