| Plant |
Height 50-120 cm, root fusiform |
| Rosette leaves |
Non-lobed to pinnatisect, entire or dentate |
| Stem |
Whitish, often violet tinged, sometimes branched, setose below |
| Stem leaves |
Linear-lanceolate or oblong with acute apex and sagittate base, all rigid, almost glossy, spinulose on midvein beneath |
| Inflorescence |
Narrow, spike-like or corymbose flat-topped panicle |
| Heads |
7-17 florets. Ligules longer than involucre, pale yellow. Involucral bracts in 4 rows, erect and rigid when achenes ripe. Outer bracts usually appressed hairy from inside |
| Achenes |
Obovate or elliptical, 6-10 mm long, 0.6-0.8 mm broad, setose at apex, 5-10 ribs, brownish or greyish, very similar to those of L. serriola. Beak white, filiform, as long as body. Pappus white |
| Reference |
Feráková V. (1977) The Genus Lactuca in Europe. Bratislava |
