Ruellia jussieuoides.jpg Ruellia terminale_cleistogamous flowers.jpg Ruellia strepens_non-resupinate flowers.jpg Ruellia ochroleuca2.jpg sister species Ruellia saccata and R. brevifolia.jpg Ruellia purshiana.jpg Ruellia strepens_resupinate flowers2.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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