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Ruellia simplex_fruits with retinacula.jpg Ruellia speciosa x R. conzattii_artificial hybrid.jpg Justicia sp2.jpg Ruellia oaxacana2_photo by V. Steinmann.jpg Petalidium ramulosum_pollen.jpg Ruellia ciliosa_photo by Bruce Sorrie.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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