pillwort
/ˈpɪlwɜːt/noun
1- a creeping grass-like aquatic fern which has slender stem-like shoots with small globular spore-producing bodies at their bases, growing on the muddy margins of ponds and lakes in western Europe丝苹。
1.1
- Pilularia globulifera, family Marsileaceae.拉丁名Pilularia globulifera, 苹科。