Ruellia simplex_fruits with retinacula.jpg Ruellia speciosa.jpg Sanchezia sp._Wisui Ecuador.jpg Ruellia yurimaguensis_photo by A. Schmidt-Lebuhn.jpg Sanchezia sp._albino morph.jpg Pseuderanthemum sp._Oaxaca.jpg Ruellia stemonacanthoides.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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