Tribounia grandiflora is a species of flowering plant in the family Gesneriaceae. The species has purple flowers, which form a narrow tube.
Tribounia grandiflora was described in 2012. It is native to karst limestone habitats in Thailand, and may be endangered.
Distribution Tribounia grandiflora is native to the wet tropical biome of Thailand, and endemic to the country. It grows in fissures in karst limestone, in deciduous forest. Its extent of occurrence is less than .
Taxonomy The species was described by David Middleton in 2012.
Middleton and Pramote Triboun collected the holotype in 2009. It was found in Thailand's Kanchanaburi province, at an elevation of , on a karst limestone mountain. The discovery of this plant, alongside other specimens, led to the creation of the genus Tribounia.
Description Tribounia grandiflora is a herb which grows up to tall. The plant is sticky, and probably an annual. The stems are reddish-brown, and hairy. The leaves are pale green. They measure long, and wide. The leaf stalks are long.
The inflorescences are long, and grow on stalks. The flower stalks are long. The petals of Tribounia grandiflora collectively measure . The petals form a long, narrow, tube, which is green at the base, then turns to reddish-purple. The tube could suggest pollination by long tongued bees. The flowers are purple.
The fruits are by , and covered in short hairs. The seeds are around long, and wide.
The flowers and fruits of Tribounia grandiflora are larger than those of Tribounia venosa.
Conservation Tribounia grandiflora may be endangered. Its habitat is threatened by agriculture and deforestation. The species is not known to occur in any protected areas.
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