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Ruellia tubiflora2.jpg Phaulopsis barteri_herbarium specimen.jpg Eremomastax speciosa_pollen.jpg Ruellia insignis.jpg Ruellia californica.jpg Strobilanthes dyerianus_reduced filament curtain.jpg Ruellia humboldtiana_fruit.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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