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Ruellia mcvaughii.jpg Petalidium ramulosum_pollen.jpg Stenostephanus sp.jpg Ruellia galeottii.jpg Ruellia tubiflora_nectar guide.jpg Ruellia bourgaei_pollen.jpg Ruellia malaca.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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