Tromotriche pedunculata subsp. pedunculata is a stem succulent that forms clumps of stems and reaches heights between 5 cm and 13 cm. Its somewhat four-angled stems may be erect or decumbent at the base. The stems are slightly toothed or indistinctly toothed, their surfaces smooth and hairless. Stem colour is grey-green and mottled or tinted purple-brown when growing in sunlight, blue-green when young.
One or two flowers grow together but successively, their stalks emerging from low down on a young stem. It is common that more buds are produced per inflorescence, but some usually fail to open. The erect flower stalks become up to 15 cm long, much taller than the stems. There are tiny hairless sepals, lance-shaped with tapering, acutely pointed tips below the corollas.
The corolla has a five-pointed star-shape, its lobes long and narrow, tapering to acute tips. The lobe margins curve down so much that they touch below, forming a tapering cylinder. The slightly wrinkled inner corolla surface is pale olive-brown to greenish yellow in the upper sections of the lobes, while low down and around the corona it has a clearly delineated pale, nearly white to greyish section, sometimes dotted red. The lower parts of lobe margins (in the pale section), are ciliate (eyelash-like) with long, dark purple vibratile (moving) hairs; the upper lobe margins hairless. The corolla spreads to a diameter of up to 6 cm.
In the dark flower centre, the small, narrow outer corona lobes are spreading and three-toothed, purplish black in colour. The inner corona above it also has purple-black lobes that are two-horned, one horn over the other, each curved and club-shaped, the club-heads knobbly, covered in angular projections (White and Sloane, 1937).