Weed Science & Agronomy
INRA-Dijon
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Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon |
Bayer Code : lacvi
Synonym(s) of Sc. name:
Classification: Compositae, Dicotyledonous
Common name: great lettuce
Synonym(s) of Common name:
Name per country: DE : Gift-Lattich ; ES : lechuga ponzoñosa ; FR : laitue vireuse ; IT : lattuga velenosa ; PT : alface-brava-maior ; EN : great lettuce ;
Biological type: Biennial
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- Cotyledons elongate, spoonlike.
- Leaves entire, ovate or deltoid, irregularly dentate.
- Height: 60-150 cm.
- Stem stout, hispid, usually purplish at the base, prickly.
- Leaves sessile, amplexicaule, with a horizontally spreading blade, toothed or sinuate, scarcely lobed, prickly on margins and main vein beneath. Whitish latex.
- Flowers yellow in glabrous heads with lanceolate bracts.
- Fruit : achene with thickened borders, hairless or few-hairy at the tip of the ovate part of the fruit. Presence of a white pappus. Fruits black slightly purplish when ripe.
- The dried latex of the stem is hypnotic.
- Risk of confusion with Lactuca serriola L. (which is differentiated by the cauline leaves exposed to the sun and held vertically in the north-south plane, glabrous above and by the narrower and paler fruit).
- Biological type: Biennial.
Mistake with: Lactuca serriola
Ecological profile (click on flags):
Rare
Present
Rare
