Abstract
Cyrtandromoea sudhansui, a new species of Phrymaceae, is described and illustrated. The species was discovered in the Eastern Himalayas in 2023 during a botanical survey in Arunachal Pradesh, India. Cyrtandromoea sudhansui is unique within the genus in having blue corolla; it also differs from the other species of Cyrtandromoea in the following combination of morphological traits: winged stem, calyx ca. 1.5 cm long and hairy along ridges, hairy stamens, hairy ovary and style. The new species is assessed as Data Deficient according to the IUCN Red List criteria. The new discovery represents the second species of the genus known in the flora of India, and a new generic record for the state of Arunachal Pradesh and for the mainland India in general.