Ruellia inflata_photo by Schmidt-Lebhun.jpg Ruellia caroliniensis.jpg Ruellia foetida.jpg Ruellia longepetiolata_weed in horticulture.jpg Blechum trinitense_syntype.jpg Ruellia stemonacanthoides.jpg Thunbergia alata_tropical weed.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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