Weed Science & Agronomy
INRA-Dijon
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Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon |
Bayer Code : lacse
Synonym(s) of Sc. name:
Classification: Compositae, Dicotyledonous
Common name: prickly lettuce
Synonym(s) of Common name:
Name per country: DE : Wilder Lattich ; ES : lechuga silvestre ; FR : laitue scarole ; IT : lattuga selvatica ; PT : alface-brava-menor ; EN : prickly lettuce ; NL : wilde sla ;
Biological type: Biennial
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- Cotyledons elongate, spoonlike.
- Leaves entire, ovate or deltoid, irregularly dentate.
- Height: 40-120 cm.
- Stem often branched, erect, glabrous or stiffly hairy below, spike -like above.
- Leaves alternate, blue-green, erect, spiny on margins and on the underside of the main veins, sessile, amplexicaule, pinnatifid. Whitish latex.
- Inflorescence 10 mm broad in numerous racemes. Involucral bracts on several rows, blue-green, often violet-tipped, glabrous. Flowers ligulate, light-yellow and few.
- Fruit : achene grey-black, elliptic, 3-4 mm, 5-9 ribs, with a beak and a pappus of 2 rows of simple hairs.
- Populations exist which are resistant to sulfonylureas in U.S.A.
- Risk of confusion with Chondrilla juncea L., Lactuca virosa L. (which is differentiated by the spreading and glandular leaves and by the broad and black fruit).
- Biological type: Biennial.
Mistake with: Chondrilla juncea , Lactuca virosa
Ecological profile (click on flags):
Present
Rare
Present
Present
Present
Present
