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Ruellia stemonacanthoides.jpg Ruellia speciosa.jpg Ruellia foetida.jpg Bravaisia integerrima_habit2.jpg Ruellieae pollen_Daniel1998.jpg Ruellia macrophylla var. lutea.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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