Romulea membranacea

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

2. Flowers yellow; outer and inner bracts similar, both with broad membranous margins and apices .............. .................................................................................................................................. 55. R. membranacea

2’. Flowers pink to magenta with a yellow cup; outer bracts with membranous margins narrower than in the inner ........................................................................................................................................................ 3