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Support the Flora of the Southeastern US

2024 has been a banner year for making the best flora we can imagine. We've created:
With financial support from people like you, we are aiming even higher in 2025. Together we can accomplish all this: Vote on our 2025 priorities
  • Add Global Conservation Ranks (GRanks) vote
  • Professional graphic keys (polyclaves) to individual families/genera vote
  • 2 new FloraQuest apps: Florida & Mid-South vote
  • Image overlays highlighting diagnostic characters with arrows vote
  • iNaturalist integration in FloraQuest vote
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*Trapa Linnaeus. European Water-chestnut.

Key to Trapa

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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Show species in Trapa

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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.

image of plant© oxidized_guacamole, some rights reserved (CC BY-NC) | Trapa bispinosa var. iinumae source | Original Image ⭷
image of plant© Erik Danielson | Trapa natans source | Original Image ⭷
image of plant© Jeff Clark, some rights reserved (CC BY), uploaded by Jeff Clark | Trapa bispinosa var. iinumae source | Original Image ⭷
image of plant© dossification, some rights reserved (CC BY-NC), uploaded by dossification | Trapa bispinosa var. iinumae 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.