The aerial parts of six Argentinean plants - commonly known as "botones de oro"- are indistinctly used either in folk medicine or to obtain herbal remedies and phytotherapics. However, these entities belong to three different genera of the Tribe Helenieae (Asteraceae): Gaillardia, Helenium and Hymenoxys, being the most used species Gaillardia megapotamica var. megapotamica (Spreng.) Bak.; G. megapotamica var. scabiosoides (Arn.) Bak.; G. megapotamica var. radiata (Griseb.) Bak.; Helenium donianum (Hook. & Arn.) Seckt; H. argentinum Ariza and Hymenoxys anthemoides (Juss.) Cass. In this work, we studied the relationships between the mentioned taxa from the morphological point of view, their coexistence in natural populations and their reputed pharmacological actions. Their histological features are described and illustrated, in order to obtain an accurate botanical identification of the products found in the market so as to guarantee their quality, especially because the samples are often already powdered or grounded.
Argentinean folk medicine; Asteraceae; Helenieae; "botones de oro"; pharmacobotanical studies; ethnofarmacological uses
