Traits distribution of the non-native invasive herbaceous species. The trait comparison between Gaillardia aristata (G. a.) and other invasive herbaceous species in the region: Ambrosia artemisiifolia (A. a.); Asclepias syriaca (A. s.); Erigeron annuus (E. a.); E. canadensis (E. c.); Helianthus tuberosus (H. t.); Impatiens glandulifera (I. g.); Oenothera villosa (O. v.); Phytolacca americana (P. a.); Reynoutria japonica (R. j.); Solidago canadensis (S. c.); S. gigantea (S. g.); Xanthium strumarium subsp. strumarium (X. s.). The x-axes only present the abbreviations of the investigated species, while the × symbols represent the exact trait values along the y-axes.