The simple, stalkless leaves of Selago luxurians are narrowly oblong to linear, growing alternate or fascicled. The leaves are thick-textured.
The flowers grow sessile in short, stem-tip spikes and corymb-like panicles. The narrow floral bracts are longer than the hairy, bell-shaped and five-lobed calyces.
The white or sometimes pale mauve to lilac corollas are five-lobed and two-lipped, spreading above the funnel-shaped tube. In picture the four stamens of each flower in picture are all exserted, the filaments white and the anthers yellow.
Flowering happens from late spring to summer (Bond and Goldblatt, 1984; iNaturalist; Wikipedia; https://www.worldfloraonline.org).