Ruellia donnell-smithii.jpg Ruellia fulgida.jpg Ruellia palustris_retinacula2.jpg Ruellia stemonacanthoides.jpg Ruellia abbreviata.jpg Ruellia bourgaei_food for herbivores.jpg Ruellia macrophylla var. lutea.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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