Hand, R. 2018: Additional data on Beta in Cyprus. – Cypricola 5: 1-3Letschert, J. P. W. 1993: Beta section Beta: biogeographical patterns of variation and taxonomy 93(1)
1Perianth segments entire
1'Perianth segments fimbriate
2Usually perennial with strong woody root; inflorescence ebracteate or with small, inconspicuous bracts in the lower half
2'Usually annual with thin root; inflorescence bracteate with at least the lower bracts similar in size to the cauline leaves
3Upper fruit surface convex or flat; perianth segments adpressed to the upper fruit surface
3'Upper fruit surface depressed; perianth segments erect, incurved at the apex