Ruellia lactea_rosette form.jpg Ruellia longepetiolata_weed in horticulture.jpg Ruellia jussieuoides.jpg Heteradelphia paulojaegeria.jpg Phaulopsis barteri_herbarium specimen.jpg Strobilanthes dyerianus.jpg Ruellia neesiana_resupinate flowers2.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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