Romulea vlokii

Manning, John C. & Goldblatt, Peter, 2001, the Arabian Peninsula and Socotra including new species, biological notes, and a new infrageneric classification, Adansonia (3) 23 (1), pp. 59-108 : 72

3. Outer bracts with distinct brown-spotted membranous margins and conspicuous membranous apices and strong, closely spaced veins; flowers without dark blotches in the throat ................................ 54. R. vlokii

3’. Outer bracts with narrow, scarcely visible membranous margins and apices and usually more distantly spaced veins; flowers with dark blotches in the throat .............................................................................. 4