Lysionotus namchoomii (Gesneriaceae), a new species from Arunachal Pradesh, India

The new species of the genus Lysionotus (Gesneriaceae), named L. namchoomii, discovered in Pakke-Kessang District of Arunachal Pradesh, India, is described and illustrated here. It differs from morphologically similar L. ziroensis mainly in glabrous vegetative organs, denticulate-crenulate leaf blade, deltoid inflorescence bracts, free spatulate glabrous calyx lobes, and corolla glabrous inside. This species is confined to two different locations, with a small population comprising a total of 60–100 individuals. The conservation status of this new species is provisionally assessed here as Critically Endangered, CR: B1a, b(iiii, v) + 2a, b(i-iii,v) following the IUCN Red List Categories and Criteria.