Ruellia pringlei_leaf cystolith.jpg Ruellia galeottii.jpg Ruellia longipedunculata.jpg Heteradelphia paulojaegeria.jpg Ruellia speciosa.jpg Strobilanthes atropurpureus.jpg Blechum trinitense_syntype.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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