The white, two-lipped flowers of Monechma incanum become about 2 cm long. The flower structure is snapdragon-like with a prominent three-lobed lower lip. The central lobe has parallel ridges angling outwards from a central axis. The upper lip is hooded and somewhat rounded with the stamens sheltered inside its tip or spreading sideways, showing dark anthers on white filaments.
One of the several interesting common names bestowed by the local farming people on this plant is the Afrikaans boegoe-ankerkarooskaapbos (buchu anchor Karoo sheep bush).
Plants of the Monechma genus, comprising more than 40 species and forming part of the Acanthaceae family, resemble those of the Justicia genus in several cases (Vlok and Schutte-Vlok, 2010; www.redlist.sanbi.org).