Sida fallax, known as yellow 'ilima, or in Hawaiian, ʻilima, 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.
ʻIlima grows from 6 inches to 10 ft tall in prostrate (beach growing) and erect (upland shrub) forms. Lowland ʻilima has silver-green foliage, mountain varieties have smooth, green foliage. Leaves can be long and narrow or rounded or heartshaped with finely to coarsely serrated leaf margins. Flowers may be solitary or occur in small clusters. 
- "Sida fallax". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 12 November 2015.
- Rauch, Fred D. (1997). "Ilima" (PDF). Cooperative Extension Service, College of Tropical Agriculture and Human Resources, University of Hawaii at Manoa. p. 1. Retrieved 17 September 2015.
- "ʻilima, apiki, ʻilima lei, kapuaokanakamaimai. ʻilima ku kala, ʻilima makanaʻa". Hawaiian Ethnobotany Database. Bernice P. Bishop Museum. Retrieved 2009-03-29.
- Hawaiian Native Plant Propagation Database: Sida fallax
- "ʻIlima". Native Hawaiian Plants. Kapiʻolani Community College.
- Native Plants Hawaii: Sida fallax
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