Romulea macowanii

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 : 70

15. Perianth tube 13-35(-65) mm long, the lower part elongate and cylindrical; tepals often orange in the lower half ................................................................................................................................ 34. R. macowanii

15’. Perianth tube 3-10 mm long, the cylindrical part very short .................................................................. 16