Perennial succulent; stems erect from decumbent base, 25-150 x 5-11 mm, obtusely 4-angled with conical teeth 3-9 mm long, glabrous, green with purple markings. Flowers 1-5; pedicels 20-60 mm long; foetid odour. Sepals 5-8 mm long, ovate-lanceolate, acute to acuminate. Corolla 45-80 mm in diam., rotate with strong transverse rugulosity; typically pale greenish yellow with purple-brown spots; annulus prominent, 18-23 mm in diam., pentagonal to circular; lobes sometimes recurved, 16-25 x 12-22 mm, ovate, acute to acuminate. Corona cream-coloured, spotted purple; outer lobes spreading or ascending, 4-6 mm long, linear-oblong, apex with 2 or 3 small teeth; inner lobes 2-4 mm long, 2-horned, incumbent on anthers, horns filiform with apices clavate and minutely tuberculate, inner horns connivent-erect and recurving, outer horns erect or ascending.
Stems erect, to 15 cm long, to 1 cm wide; teeth conical. Flowers 8–10 mm long, 4.5–8 cm diam.; pedicels 6–12 mm long, glabrous. Corolla campanulate, yellow with brown to purple blotches; lobes lanceolate-ovate, 2–2.5 cm long, 1.5–1.8 mm wide. Annular corona 3–4 mm long, 2–2.3 cm diam.; staminal corona lobes erect and incurved over staminal column, yellow brown with brown to purple blotches; interstaminal corona lobes oblong, 5–6 mm long, 1.4–1.5 mm wide, bilobed, yellow and brown with brown to purple blotches. Follicles 6–8 cm long.
Like O. pulchella but annulus forming a shallowly bowl-shaped tube with spreading thinner rim, inner corona lobes much longer, tuberculate-clavate-tipped with prominent dorsal horn.
A small succulent plant that forms clumps 5-20 cm across. The stems are 2.5-10 cm long and 5-10 mm thick. They are green with purple to brown mottling. .