Trapa incisa; a species of water caltrop
A specific aquatic plant closely related to the water caltrop (菱). Used in botanical contexts.
Trapa incisa is an aquatic plant that grows in rice paddies and ponds.
You can see the nuts of Trapa incisa in this pond.
Katakana spelling is common for plant names; usually written in kana.
Kanji spelling exists but is rarely used; the plant is normally written in kana.
The name combines 姫 (hime, 'princess' or 'small and delicate') with 菱 (bishi, 'water caltrop'), referring to a smaller or more delicate species of water caltrop. The exact derivation is uncertain.