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"Iwa-nanten" (Leucothoe keiskei) belongs to Ericaceae (the Azalea family). It is an evergreen shrub that is distributed on the Pacific side of Honshu in Japan, from the Chichibu Mountains west to the Kii Peninsula. It grows on shady rocks and in forests in mountainous areas and grows to about 1 m tall. The branches hang down in an arching manner. The leaves are narrowly ovate to broadly lanceolate, alternate, and the edges are rolled inward. The leaves turn red in fall. White tubular flowers bloom drooping in the axils of the leaves from June to July. The tip of the corolla has five shallow lobes. The Japanese name is derived from the fact that it grows on rocks and its leaves resemble those of the Heavenly bamboo. The species is named after Keisuke Ito, a botanist of the Meiji era.
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