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Hydrodiscus koyamae is a species of flowering plant in the family Podostemaceae. It is the sole species in genus Hydrodiscus. It is an aquatic subshrub endemic to north-central Laos.
Hydrodiscus koyamae grows on rocks in seasonally-inundated stream rapids and waterfalls. It roots to rocks with a flattened cylindrical disk, from which many-branched shoots grow out to one meter in length.
Text excerpted from the Wikipedia article Hydrodiscus by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
