Grazielia nummularia (Hook. & Arn.)

de Souza, Tiago J. T., S, Bordignon, ergio A. L., Apel, Miriam A. & Henriques, Amelia T., 2021, Volatile constituents of Eupatorieae (Asteraceae). Compositional multivariate analysis of volatile oils from Southern Brazilian species in the subtribe Disynaphiinae, Phytochemistry (112734) 186, pp. 1-23 : 3

Grazielia nummularia

(syn. Eupatorium nummularium , Dimorpholepis nummularia ),

a 0.3–0.9 m tall, low-branched, white-flowered sub-shrub native to Southern Brazil (Parana´and Rio Grande do Sul), which is anatomically very similar and exhibits the same geographical distribution as G. gaudichaudieana ( King and Robinson, 1987; Matzenbacher, 1979), was collected in Sapiranga (2006). The VOs in its leaves/inflorescences are also qualitatively and quantitatively very similar to those obtained from G. gaudichaudieana . Hydrocarbon monoterpenes are the main fraction (78.9%) and are composed of the same substances that make up the VOs in G. gaudichaudieana (α- pinene, 8.5%; β- pinene, 20.5%; and limonene, 36.5%). The sesquiterpene fraction is very similar to that of the G. gaudichaudieana sample obtained from Canela/05 with 10.1 vs 11.3% germacrene D. The VOs obtained from the branches of G. nummularia present some quantitative differences when compared to the plant’ s leaves: A lower percentage of pinenes (α- pinene, 2.8%; β- pinene, 10.0%) and a higher percentage of para-cymene (5.5% vs 1.8% in the leaves/inflorescences), the percentage of limonene was similar in both subsamples (31.5 vs 36.5%), and the hydrocarbon sesquiterpene germacrene D was higher in the branches (26.3% vs. 10.1%). This is the first piece of evidence showing that the lesser-known G. nummularia is not only botanically and geographically, but also chemically similar to G. gaudichaudieana , suggesting that the bouquet of volatile terpenes is likely to exert similar functions in the biological interactions of both species with insects.