(A) Phylogenetic reconstruction of Ceratopteris, with the sister genus Acrostichum as the outgroup, based on Kinosian et al., 2020a; Adjie et al., 2007; Yu et al., 2021 Zhang et al., 2020. Absent from this phylogeny is the Brazilian species C. froesii, for which no genetic sequence data is available. (B) Distribution map of ten Ceratopteris species: pink, C. richardii; orange, C. shingii; green, C. cornuta; light blue, C. thalictroides; dark blue, C. oblongiloba; purple, C. gaudichaudii; grey, C. pteridoides; black, C. froesii; brown, C. chingii, and red C. chunii. Shaded areas show where a species is common, colored dots show where species occur outside their most common range, or multiple species are found in a small area. Location data from Kinosian et al., 2020a; Lloyd, 1974; Masuyama and Watano, 2010; Zhang et al., 2020; Yu et al., 2021 https://gbif.org/.