擬宝珠

擬(ぎ)宝(ぼう)珠(し) or 擬宝珠(ギボウシ) • (gibōshi) 

1. ornamental metal finials used on bridge posts
2. allium flowers

   Synonym: 葱坊主 (negibōzu)

3. plants of genus Hosta

   Synonym: 甘菜 (amana)

As with many terms that name organisms, this term is often spelled in katakana, especially in biological contexts (where katakana is customary).