What is "butomus umbellatus"

Flowering \Flow"er*ing\, a. (Bot.) Having conspicuous flowers; -- used as an epithet with many names of plants; as, flowering ash; flowering dogwood; flowering almond, etc.

Flowering fern, a genus of showy ferns ( Osmunda), with conspicuous bivalvular sporangia. They usually grow in wet places.

Flowering plants, plants which have stamens and pistils, and produce true seeds; phenogamous plants; -- distinguished from flowerless plants.

Flowering rush, a European rushlike plant ( Butomus umbellatus), with an umbel of rosy blossoms.

Butomus umbellatus

]] Butomus umbellatus is the Old World Palearctic and Asian plant species in the family Butomaceae. Common names include flowering rush or grass rush.