Schemes (A, C) and cross-sections of the achenes (B, D). A, B Scorzonera tragopogonoides (Piptopogon type), B from Kryltsov s.n. (MW0891887) C, D S. armeniaca (Podospermum type), D from Kuthatheladze s.n. (LE). Designation of the colours in A and C: yellow – thin-walled parenchyma; red – sclerenchyma (of parallel orientation); pink – sclerenchyma (of perpendicular orientation); dark blue – collenchymatous parenchyma (A); blue – seed coat; violet dots (A, C) – vestiges of vascular bundles in the seed coat (A) and in the pericarp (C); green – endosperm; central white area – seed hollow.