Geissorhiza erosa, in Afrikaans known as the witsyblom (white silk flower) or syblom (silk flower) and earlier scientifically G. inflexa var. erosa, is a cormous perennial reaching heights from 12 cm to 35 cm.
Sword-shaped leaves and a flower stem grow annually from the perennial corm that has a woody coat. Bloomtime is late winter to early spring.
The species distribution is in the southwest of the Western Cape from Tulbagh and Porterville to Gordon's Bay.
The plants are found on moist clay slopes and flats in renosterveld and fynbos. The habitat population is deemed endangered early in the twenty first century, due to farming, housing and habitat degradation (Bond and Goldblatt, 1984; iNaturalist; iSpot; http://redlist.sanbi.org).