Ruellia speciosa x R. conzattii_artificial hybrid.jpg Ruellia humboldtiana_fruit.jpg Ruellia chartacea_bract.jpg Ruellieae pollen_Daniel1998.jpg Ruellia stemonacanthoides.jpg Strobilanthes dyerianus.jpg Ruellia pittieri.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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