Helminthotheca echioides (L.) Holub (Asteraceae, Cichorieae), a new record for an alien species in the Brazilian Pampa. SciELO Preprints, 2026. DOI: 10.1590/SciELOPreprints.18751. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/18751. Acesso em: 5 nov. 2026.