Echinodorus L.C. Richard ex Engelmann. Burhead.
A genus of about 27 species, herbs, primarily of the American tropics and subtropics. Christenhusz, Fay, & Byng (2018) proposed splitting Echinodorus into two genera, Echinodorus (consisting of E. berteroi only), and Aquarius Christenhusz & Byng (consisting of all other species of Echinodorus), allegedly based on the results of Lehtonen & Myllys (2008). Lehtonen & Myllys's (2008) results are ambiguous, however, and it does not appear that this split is well-founded. Li et al. (2022) sampled four species of Echinodorus, and E. berteroi was "basal" to a clade of the other three, providing ambiguous support to the idea of separating the two genera, but there results contradicted Christenhusz, Fay, & Byng's (2018) contention that Echinodorus berteroi "is found separate from the remainder of Echinodorus, often with other genera like Albidella, Alisma or Baldellia interdigitated". We retain the traditional circumscription of Echinodorus.
Ref: Christenhusz, Fay, & Byng (2018); Haynes & Hellquist (2000a) In Flora of North America Editorial Committee (2000); Haynes, Les, & Holm-Nielsen In Kubitzki (1998b); Lehtonen (2008); Lehtonen (2009); Lehtonen & Myllys (2008); Li et al. (2022). Show full citations.
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