shellflower

English

Etymology

From shell +‎ flower.

Noun

shellflower (plural shellflowers)

1. A floating aquatic plant, of species Pistia stratiotes, with green rosettes of leaves and inconspicuous flowers.

   Synonyms: water lettuce, water cabbage

2. A plant in the mint family grown for its distinctive circular green calyxes.

   Synonyms: bells of Ireland, Molucca balm