Meikle, R.D. 1985: Flora of Cyprus 2
Hybrids are difficult to define because of introgression (see Meikle 1985 for determination).
1Bark rough, fibrous; inflorescence subglabrous or pubescent; corolla 7-10 x 4-7 mm; fruits 1.5-2 cm diam., rough with projecting papillae; leaves usually serrate, not noticeably discolorous; petiole usually less than 1 cm long
1'Bark smooth, flaking; inflorescence glandular-pilose; corolla 7 x 6 mm; fruits less than 1.3 cm diam., verruculose, with flattened papillae; leaves usually entire, markedly pallid below; petiole commonly 2-4 cm long