- Kingdom: Animalia
- Phylum: Cnidaria
- Class: Hydrozoa
- Subclass: Hydroidolina
- Order: Anthoathecata
- Suborder: Aplanulata
- Family: Tubulariidae
- Scientific name: Tubularia indivisa
- Norwegian: blomsterpolypp
Hydroid stage: Yellow stem without branches, with a single polyp on the top. The stem is usually 3-15 cm long. The 20-30 tentacles constituting the outer ring, may reach a length of 2 cm. A large number of small tentacles form an inner ring around the pale pink polyp. It may be confused with the ringed tubularia.
Medusa stage: There is no medusa released from the hydroid.
It seems to prefer current exposed locations with rocks and boulders.
This hydroid is well known along the coasts of Europe, from the Mediterranean to the Arctic.