Sida fallax, known as ʻilima in Hawaiian, is a species of herbaceous flowering plant in the Hibiscus family, Malvaceae, that occurs on some Pacific Islands. The flowers are small, 0.75–1 in (1.9–2.5 cm) in diameter, have five petals, and are a golden yellow in color. Plants may be erect or prostrate and are found in drier areas in sandy soils, often near the ocean. ʻIlima is the symbol of Laloimehani and is the flower for the island of Oʻahu.
Native Hawaiians used ʻilima flowers to make lei. S. fallax is sometimes used as a groundcover in tropical areas.