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Ruellia hirsutoglandulosa.jpg Ruellia noctiflora.jpg Sanchezia parvibracteata.jpg Ruellia speciosa x R. conzattii_artificial hybrid.jpg Bravaisia integerrima.jpg Ruellia anthracina_photo by STRI.jpg Thunbergia alata_tropical weed.jpg

Acanth Fact of the Day

A major clade within Acanthaceae is the cystolith clade. Cystoliths are anatomical structures found in leaves and are thought to be composed of calcium carbonate or calcium oxalate. Their function is unknown.
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