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Water Caltrop
Trapa natans
コオニビシ
A floating-leaved plant of the Lythraceae family (genus Trapa) that produces fruits smaller than those of Trapa japonica with four horns. It grows in ponds and rice paddies.
Identification Points
- ✓浮葉はひし形でロゼット状
- ✓果実に4本の角（うち2本は短いことも）
- ✓葉柄に浮き袋
Habitat
本州・四国・九州の池沼・水田
Season
7〜10月（花）
3D Specimen Model
Kyushu University, Shikano Lab (CC0)
View on Sketchfab→Morphological TraitsAI-estimated, needs verification
Leaf type
Simple
Venation
Pinnate
Leaf margin
Entire
Petal count
3 petals
Leaf dissection
Undivided
Ovary position
Superior
Plant sex
Hermaphrodite
Phylogenetic Positionミソハギ科 →
Phylogenetic Position
Angiosperms > Eudicots > Core eudicots > Myrtales > Lythraceae
Divergence Era
Late Cretaceous to Paleogene (about 80–70 million years ago)
Sources & References
🤖Claude AI
AI-generated, needs verification