Ruellia hygrophila.jpg Ruellia tubiflora_nectar guide.jpg Ruellia abbreviata.jpg Ruellia neesiana_resupinate flowers.jpg Anoura caudata_nectivorous bat.jpg Ruellia pringlei2.jpg Ruellieae pollen_Daniel1998.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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