Ruellia fulgida.jpg Tetramerium sp.jpg Ruellia menthoides.jpg Ruellia geminiflora_color polymorphism.jpg Ruellia longepetiolata_weed in horticulture.jpg Strobilanthes atropurpureus2.jpg Ruellia californica.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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