Poterium

R. D. Meikle, Flora of Cyprus 1. 1977
but modified
1Fruits distinctly 4-angled, the surfaces reticulate, 2.5-3 x 2-2.5 mm; achenes normally 1-2 in each fruit, c. 2-3 mm long
1'Fruits not angled, or obscurely angled, surfaces strongly verrucose-tuberculate, 4.5-6 x 4-5 mm; achenes normally 2-3 in each fruit, 3-4 mm long