Figure 5
Reticulation in Hieracium. A graphical summary of reticulation based on ETS features and (in two cases) on chloroplast capture is shown on a simplified ETS tree (unsupported branches collapsed) that includes also the ribotype lineages occurring only in hybrids (Wx, Wy, Ex). W - 'Western', Wx - 'unknown Western 1', Wy - 'unknown Western 2', WP - 'Pyrenean', E - 'Eastern', EB - Balkan species, EU - 'H. umbellatum' clade, Ex - 'unknown Eastern', EA - 'H. alpinum' lineage, Epo - 'H. porrifolium' clade. Detailed results of this analysis are given in Additional file 6: ETS phylogeny with ribotypes present only in hybrids. Small arrows/thin lines represent hybridizations within each clade, larger arrowheads/bold lines indicate involvement of both major clades. If no particular subclade could be inferred for a given combination, arrows start at the polytomies of the 'Western' or 'Eastern' clades. Multiple hybridizations are indicated by patterned arrows. They reflect particular ribotype combinations, not any order of subsequent hybridizations. Numbers near the arrowheads refer to particular hybrid accessions: 1 - H. amplexicaule, H. gouani; 2 - H. bracteolatum, H. racemosum, H. sabaudum; 3 - H. bupleuroides 1033, 4 - H. caesium, H. lachenalii, H. laevigatum; 5 - H. candidum, H. cerinthoides, H. cordifolium, H. gymnocerinthe; 6 - H. glaucum; 7 - H. lucidum; 8 - H. mixtum, H. prenanthoides 1252, 9 - H. olympicum; 10 - H. pojoritense; 11 - H. prenanthoides 1161, 12 - H. prenanthoides 1187, 13 - H. sparsum (2); 14 - H. gymnocephalum (2), 15 - H. pilosum 1226/2, H. villosum 1305, 16 - H. plumulosum; 17 - H. heterogynum.