Posidonia oceanica aka Mediterranean Tapeweed

Taxonomy

Genus Posidonia Family Posidoniaceae Order Alismatales Class Liliopsida Phylum Tracheophyta

Common names

Mediterranean Tapeweed, Neptune Grass, Posidonia

How to care for Mediterranean Tapeweed

Toxicity

The toxicity level of this plant has not been officially confirmed by Ploi. If there is a possibility of ingestion of plant material with an uncertain toxicity by you, a family member, or a pet, it is advisable to seek the assistance of a medical professional.

More info:
Wikipedia