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Ruellia palustris_retinacula2.jpg Ruellia elegans_Anthocyanidin Synthase Chromatogram copy.jpg Ruellia pringlei.jpg Ruellia humboldtiana.jpg Ruellia galeottii.jpg Ruellia breedlovei_photo by R. Freyre.jpg Ruellia exilis_photo by Ricardo Kriebel.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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