Pentaphragma narathiwatense is a species of flowering plant in the family Pentaphragmataceae. It is a perennial plant with slightly asymmetrical leaves, and white flowers. The species is native to Thailand, and was described in 2023.
Taxonomy The species was described by Manop Poopath and Rachun Pooma in 2023. The type specimen was collected in Hala-Bala Wildlife Sanctuary, Narathiwat Province, Thailand.
Distribution Pentaphragma narathiwatense is native to the wet tropical biome of peninsular Thailand. It grows in evergreen forests, in moist, shady areas near streams, at elevations of around .
Description Pentaphragma narathiwatense is a perennial plant that grows up to high. The leaves are slightly asymmetrical at the base, long, wide, and have long stems.
The inflorescence is a lax, long spike, with up to ten flowers. The inflorescence stem is long. The flowers lack stems. The calyx is white. The corolla is white, spoon-shaped, long, wide, and densely hairy on the outside. The flowers have five stamens.
Etymology The specific epithet narathiwatense refers to Narathiwat Province, where the type specimen was collected.
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