Derived from the Latin orbis — orb, referring to the shape of the flower.
Perennial, succulent, tufted herbs with clear latex, stems hairless. Leaves rudimentary; mucilage glands absent. Corolla bell-shaped, rough or warty, hairless; tube short; lobes free at tips, valvate. Annular corona present; corolline corona absent; staminal and interstaminal coronas present, with the latter not sessile or fused to the corolla tube. Follicles tapered to each end; seeds tufted at one end.
Seed or cuttings.
Large yellow and brown, bell-shaped flowers.
About 20 species in southern and E Africa.
Source: (2002). Hoya. In: . Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.