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Ruellia petiolaris_photo by V. Steinman.jpg Ruellia foetida.jpg Ruellia longepetiolata_weed in horticulture.jpg Barleria oenotherioides.jpg Ruellia strepens_resupinate flowers2.jpg Ruellia maya.jpg Ruellia elegans_Anthocyanidin Synthase Chromatogram copy.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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