The simple, needle-like leaves of Euryops rehmannii are linear in shape, smooth and channelled on top, curving up from the stems, particularly nearer the stem-tips. They become from 1 cm to 5 cm long and only 1 mm wide, tending to drop off lower down from old stems.
The daisy-shaped flowerheads grow on long stalks. The flowerhead has yellow rays spreading in one ring around the yellow disc comprising many tiny florets. Flowerhead diameter is about 1,5 cm. Flowering happens in spring.
The species resembles E. erectus but its bracts around the flowerheads are free to the base (Vlok and Schutte-Vlok, 2010; Bond and Goldblatt, 1984; iSpot).