Ruellia pringlei_leaf cystolith.jpg Tetramerium sp.jpg Ruellia ruiziana_photo be A. Schmidt-Lebuhn.jpg Sanchezia cf. speciosa.jpg Ruellia jaliscana_vegetative in field.jpg Ruellia mcvaughii.jpg Ruellia malaca_nectary.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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