Blue lettuce
Lactuca tatarica
Blue lettuce is a tall perennial herb with showy blue flowers (2 cm across). The sap of this plant is milky. The leaves are alternate on the stem, lance-shapped and 5-18 mm long. Upper leaves are entire while leaves on the bottom are usually prominently toothed. The fruit is an achene with a black or brown seed.
Pflanzenschutzmittel
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