Schemes (A, C) and cross-sections of the achenes (B, D). A, B Scorzonera divaricata (Scorzonera divaricata clade), B from Gubanov 8585 (MW0194347) C, D Pterachaenia stewartii (Pterachaenia clade), D from Anders 8990 (W0032145). Designation of the colours in A and C: orange (A) – mechanical subepidermal sheath; grey (C) – wings; yellow – thin-walled parenchyma; hatched areas (A, C) – thick-walled (lignified) parenchyma; red – sclerenchyma (of parallel orientation); blue – seed coat; violet dots (A, C) – vestiges of vascular bundles in the seed coat; green – endosperm; central white area – seed hollow.

  Part of: Zaika MA, Kilian N, Jones K, Krinitsina AA, Nilova MV, Speranskaya AS, Sukhorukov AP (2020) Scorzonera sensu lato (Asteraceae, Cichorieae) – taxonomic reassessment in the light of new molecular phylogenetic and carpological analyses. PhytoKeys 137: 1-85.