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 exscapa, commonly known as White Tile-Root, Longtube Satin or White Satin in English and Langpyp-Sysie in Afrikaans and synonymously known as Engysiphon exscapus and Engysiphon longitubus, is a near threatened South African endemic species found in the Northern Cape and Western Cape provinces where it extends along the Atlantic Coast from near Hondeklipbaai south to Blouberg near Cape Town and inland to the Bokkeveld and Pakhuis Mountains. It usually occurs in deep alluvial coastal sands in sandveld vegetation, or inland in fynbos. It flowers early spring during the months of September and October. It has large cream to ivory flowers with a long slender tube and projecting anthers.