R. D. Meikle, Flora of Cyprus 1. 1977
but modified and supplemented
1Perennial with woody rootstock; flowers 2-3 cm diam.; calyx about 2.5 cm long
1'Annual; flowers less than 1 cm diam.; calyx up to 10 mm long
2Petals with 2 short coronal scales; calyx c. 10 mm long
2'Petals without coronal scales, rarely with inconspicuous scales; calyx 6-7 mm long