Volatile constituents of Eupatorieae (Asteraceae). Compositional multivariate analysis of volatile oils from Southern Brazilian species in the subtribe Disynaphiinae Author de Souza, Tiago J. T. * & Faculdade de Farm´acia, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Ipiranga, 2752, 90610 - 000, Porto Alegre, Brazil Author S Author Bordignon, ergio A. L. Programa de P´os-Graduaç ˜ ao em Avaliaç ˜ ao de Impactos Ambientais, Centro Universit´ario La Salle, Canoas, Brazil Author Apel, Miriam A. Author Henriques, Amelia T. text Phytochemistry 2021 112734 2021-06-30 186 1 23 http://dx.doi.org/10.1016/j.phytochem.2021.112734 journal article 10.1016/j.phytochem.2021.112734 1873-3700 8258534 Two samples of Disynaphia spathulata (Hook. & Arn.) R.M.King & H. Rob. (syn. Eupatorium spathulatum , common name: “macelinha”) ( King and Robinson, 1987 ; Matzenbacher, 1979 ), a sub-shrub up to 1.5 m tall, were obtained from the municipality of Canela, RS. The VO yields for the two samplings were similar despite their different vegetative stages ( Table 1 and Table S1 ). In regard the chemical composition of the VOs of this species, the inflorescences and leaves of the first sample (Canela/05, April) showed very similar chemical compositions with a predominance of hydrocarbon monoterpenes (56.8–58.9%), especially α- pinene (7.0–11.6%), β- pinene (14.9–24.1%), limonene (12.2–13.1%), and (E)-β- ocimene (13.3–2.3%). In the sesquiterpene fraction, three main compounds were identified in the flowering period: The hydrocarbon sesquiterpenes β- caryophyllene, germacrene D, and bicyclogermacrene. However, the second sampling in the vegetative stage (Viamao/05, October) presented a very different quantitative pattern, in which oxygenated sesquiterpenes (64.1%), spathulenol (22.6%), caryophyllene oxide (7.0%), and α- cadinol (12.0%) were observed.