The Haworthia viscosa belongs to Liliaceae (the Lily family). It is a perennial herb that is distributed in the Eastern Cape to Western Cape regions of South Africa. It forms a tower-like rosette of stems, 8 cm in diameter and about 30 cm tall. The leaves are fleshy, triangular, and attached on three sides. The leaves are dark green, but turn red when stressed. Horticulturally, it is called "竜城" (Ryujo) in Japan.