Kuwai (arrowhead tubers or Sagittaria trifolia) are perennial aquatic herbs in the Alismataceae (water plantain) family and are also called 'tagusa', 'enbi-kusa' or 'kuwae.'
クワイ（慈姑、英：arrowhead、学名：Sagittariatrifolia）は、オモダカ科の水生多年生植物で、別名（田草、燕尾草、クワエ）とも言う。