"romulea sabulosa" has slender, tapering, mostly pale green filaments, while "r. monadelpha" as short, oblong, black filaments that are pressed together or fused. the flower stalk of "r. sabulosa" is slender, more or less circular in cross section and does not curve when the fruit is ripe, but in "r. monadelpha" the flower stem is stout and has one flattened side while it spreads out when the fruit is ripe. the species occur in the same area near nieuwoudtville, but have a different habitat: "r. sabulosa" occurs only on a light sandy clay known as tillite, while "r. monadelpha" grows on heavy dolerite clay.