The Mossy saxifrage hybrids (Saxifraga x arendsii) belongs to Saxifragaceae (the Saxifrage family). It is an evergreen perennial herb that is the generic name for a group of horticultural species that are hybrids of several species of the genus Saxifraga, mainly the European native "Irish saxifrage" (Saxifrage rosacea). The rhizome is thin and spreads horizontally, forming a rosette at the tip. It is 8-15 cm tall. It produces small mossy, rhizomatous leaves with three to five palmate lobes. From March to May, it produces a scape with cymose inflorescences at the top of the stem, and produces flowers about 2 cm in diameter. The flowers come in a variety of colors, including deep red, pink, cream, and white. It is sterile, so propagation is by cuttings or division. It is horticulturally called "Kumoma-gusa" in Japan.