Aridarum caulescens is a rheophytic aroid native to Borneo, where it grows attached to rocks and hard surfaces in fast-flowing jungle streams and river systems. These habitats are highly oxygenated, constantly moving, and seasonally variable, with the plant often growing partially submerged or fully submerged during periods of high water. The species is adapted to cling tightly to rock surfaces in areas with strong current and clear, clean water.
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