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Iva hayesiana is a species of flowering plant in the daisy family known by the common names San Diego marsh-elder and San Diego povertyweed. It is native to Baja California, and to California only in the vicinity of San Diego. This is a shrubby perennial herb approaching maximum heights near one meter. Its green oval-shaped leaves are fleshy, glandular, aromatic, and 3 to 6 centimeters long. The flowers are nearly invisible; male flowers have translucent corollas and simple yellow stamens and female flowers, if they occur, lacking corollas altogether. This is a plant of mineral-rich waterways such as intermittent streams and alkali flats.
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