The flowers of Hypoxis filiformis grow solitary or in clusters of up to three on unequal pedicels, the individual flower stalks. The erect, slender peduncle (the overall inflorescence stalk) is green, unlike the often maroon-based one of H. argentea, a similar species.
The six, spreading, yellow tepals taper at the base and to their blunt tips. Their inner surfaces are smooth, the outer ones hairy. The young flower in picture still has yellow anthers.
Flowering happens in spring and summer (Van Wyk and Malan, 1997; Lowrey and Wright, 1987; iNaturalist).