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Ruellia tubiflora2.jpg Ruellia lactea_upright form.jpg Ruellia jaliscana_illustration by A. Labadie.jpg Strobilanthes dyerianus.jpg Ruellia noctiflora2.jpg Ruellia yurimaguensis_photo by A. Schmidt-Lebuhn.jpg Ruellia ciliosa_photo by Bruce Sorrie.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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