Fig 2. AMMI1 biplot for mucilage yield (g m^-2) of 30 Plantago genotypes (P. major, G1- G7; P. officinalis, G8-G10; P. amplexicaulis, G11; P. ovata, G12-G16; P. psyllium, G17-G21; P. lanceolata, G22-G26; P. coronopus, G27- G28; P. lagopus, G29- G30) and 10 environments (E).

Köppen-Geiger climate classification [45] letter: B: arid, s: summer dry, k: cold arid.