Plants 200-600 mm long. Basal leaf filiform, 200-600 x 1-2 mm, grooves rather narrow. Inner bract submembranous, greenish in the middle of the upper half, with wide colourless or brown-streaked or speckled membranous margins. Flowers (20-)30-40 mm long, bright golden or cadmium-yellow, with slender dark lines in the cup, outer perianth segments frequently with irregular brown markings on the backs. Perianth tube slightly shorter and wider. Style 12-18 mm; stigmas at or above the anther tips.
Similar to R. flava but flowers orange-yellow with dark lines in cup.