Leionema praetermissum is a shrub to high with several or few stems emanating from the base. The stems are warty and needle-shaped with occasional white star-shaped hairs. The leaves are smooth, narrow, linear to lance shaped, long, edges slightly rolled under, arranged alternately, sometimes crowded, smooth and
sessile or on a short
petiole long, and ending with a sharp point. The
inflorescence is a cluster of 3-10 flowers at the end of branches or in the leaf axils on a
pedicel long, flowers barely longer than the leaves. The
peduncle is slender and warty, the
pedicels long. The triangular, narrow
calyx lobes are smooth on the outside with a stiff apex. The 5 petals are spreading, each petal long, upperside white, underneath pale green, glandular and there are 10 prominent stamens. The fruit is a capsule, long, wide. Flowering occurs from April to July. ==Taxonomy and naming==