Sida

fanpetals, sidas

Sida is a of flowering plants in the mallow (Malvaceae), distributed primarily in tropical and subtropical regions worldwide with particular diversity in the Americas. The genus comprises herbaceous plants and small shrubs commonly known as fanpetals or sidas. Several have become economically significant as agricultural weeds, notably Sida spinosa (prickly sida) in the southern United States and Sida acuta as an pasture weed in tropical regions globally.

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Pronunciation

How to pronounce Sida: /ˈsiː.də/

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Habitat

Tropical and subtropical environments including savannah- with pronounced wet and dry seasons; agricultural fields; pastures and rangelands; capable of persisting under heavy including . Some tolerate wide ranges of soil types including silty clay loam and clay soils.

Distribution

Tropical and subtropical regions worldwide, especially in the Americas; Sida spinosa widely distributed in the southern United States; Sida acuta to Central America, now across the tropics including northern Australia, Papua New Guinea, and Pacific Islands.

Life Cycle

or depending on ; Sida spinosa exhibits seedling from early March (when soil temperature reaches 13.8°C) through mid-October, with emergence peaks associated with rainfall events; seed production highly fecund with 3,000–8,100 seeds per depending on light conditions.

Ecological Role

Agricultural weed causing yield reduction; Sida spinosa can reduce soybean yields approximately 25% without control; forms dense monospecific stands in disturbed ; Sida acuta has been targeted with using the Calligrapha pantherina since the late 1980s, with successful restoration of vegetation reported in some areas.

Human Relevance

Significant agricultural pest; Sida spinosa is a troublesome weed in southern U.S. agronomic ; Sida acuta is a major pasture weed in tropical regions with pronounced economic impact; programs have been implemented for management.