Ruellia jaliscana_vegetative in field.jpg Blechum trinitense_syntype.jpg R_ yurimaguensis2_photo by A. Schmidt-Lebuhn.jpg Ruellia longepetiolata_weed in horticulture.jpg Ruellia saeri.jpg Ruellia strepens_resupinate flowers.jpg Ruellia palustris_retinacula2.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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