Meikle, R.D. 1977: Flora of Cyprus 1
but modified
1Achenes without a dorsal tooth or transverse ventral ridge, c. 15-30 achenes per head
1'Achenes with a dorsal tooth and transverse ridge
2Achenes c. 15-30, 4-6 x 2-4 mm, beak conspicuous, ascending, remote from dorsal tooth
2'Achenes c. 30-50, c. 2-5 x 2 mm, beak rather short, pressed against dorsal tooth
3Transverse ventral ridge of achene obscurely sulcate or dentate; plants 15-30 cm high (flowers red, yellow or orange)
3'Transverse ventral ridge of achene conspicuously toothed; plants seldom more than 12 cm high (flowers always yellow?)