lˈæktuːkə sˌɛɹɪˈoʊlə kəntˈeɪnz lˌæktuːkˈɛɹiəm, wˌɪtʃ ɪz ðə mˈɪlki sˈæp wˈaɪt lˈeɪtɛks ðæt flˈoʊz θɹuː ðə stˈɛm ʌvðə plˈænt.
Lactuca serriola contains lactucarium, which is the milky sap (white latex) that flows through the stem of the plant.