As the name implies, this species is often hiding under other plants or between rocks. For that reason, it is not easy to make good pictures of it. The photographer usually must choose between showing either what the plant looks like or how well it is hidden.
The plants are shrublets with fat (pachycaul) barrel-or flask-shaped stems and thin branches up to 30 cm long. They have soft leaves, which are mainly crowded at the branch tips and are long and narrow: 40-100 mm long and 2-3 mm wide.
The flowers appear from April to October.
One can come across these plant from central Namibia to the Little Karoo on gravelly flats and slopes.