*Trapa Linnaeus. Common name: 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).
References: APG IV (2016); Chorak et al. (2019); Dodd et al. (2019); Graham In Kubitzki, Bayer, & Stevens (2007); Hellquist & Graham (2021) In Flora of North America Editorial Committee (2021). Show full citations.
Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.
© oxidized_guacamole, some rights reserved (CC BY-NC) | Trapa bispinosa var. jinumae source | Original Image ⭷
© Erik Danielson | Trapa natans source | Original Image ⭷
© Jeff Clark, some rights reserved (CC BY), uploaded by Jeff Clark | Trapa bispinosa var. jinumae source | Original Image ⭷
© dossification, some rights reserved (CC BY-NC), uploaded by dossification | Trapa bispinosa var. jinumae source | Original Image ⭷Feedback
See something wrong or missing on about Trapa? Let us know here: (Please include your name and email if at all complicated so we can clarify if needed.) We greatly appreciate feedback, and will include updates from you in our next webapp update, which can take a few months. If a species is not keyed, that's because keying is ongoing. Please don't send us feedback about unkeyed species.