*Trapa Linnaeus. European Water-chestnut.
A genus of 1 highly polymorphic or up to 45 more narrowly defined species, annual aquatic herbs, native of the Old World. Trapa is often placed in a monogeneric family, Trapaceae, but the genus is deeply embedded phylogenetically in Lythraceae (Graham, Diazgranados, & Barber 2011; Hellquist & Graham 2021).
Ref: APG IV (2016); Chorak et al. (2019); Dodd et al. (2019); Graham In Kubitzki, Bayer, & Stevens (2007); Graham, Diazgranados, & Barber (2011); Hellquist & Graham (2021) In Flora of North America Editorial Committee (2021). Show full citations.
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