It grows as a lump in the cracks of coastal rocks. Evergreen perennial with a height of about 20 cm. The leaves are about 2 cm long and thick and shiny. From August to September attach small white flowers to the base of the leaves and the tip of the stem. The flowers are cylindrical and the tip is four-teared.
The name "Seijirushi" means Mugura growing on the rocks of the sea. Mugura is a meaning of flourishing with many names in flower of the Rubiaceae. It is galling in the rocks while it is bathed in the sea breeze and the wave splash, and it is small although it is small.