R_ yurimaguensis2_photo by A. Schmidt-Lebuhn.jpg Ruellieae pollen_Daniel1998.jpg Ruellia macrophylla var. lutea.jpg Ruellia mcvaughii.jpg Ruellia palustris_retinacula2.jpg Ruellia bourgaei.jpg Ruellia longepetiolata_weed in horticulture.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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