Geissorhiza is a large genus of around 84 perennial species, of small to medium corm bearing plants in the Iridaceae family found in the winter rainfall region of the south and west coasts of southern Africa. Many of them make very handsome container plants and benefit from extra water during growth. The name Geissorhiza is derived from the Greek words geisson and rhiza which mean tile and root respectively. This is in reference to a tunic which covers the corms like a roof tile. The bulb-like structure is used as a storage organ during the dormant period. It is closely related to the genus Hesperantha, the main difference being that most Hesperantha are night bloomers.

Geissorhiza melanthera, commonly known as Blackanther Satin, is an endangered South African endemic species found in the Western Cape province in the western Piketberg region near Aurora. It occurs in deep sand on gentle south-facing fynbos covered slopes, flowering best after fire. Growing 14–18 cm high this species flowers in spring from the end of September till mid-October.