Journal of Biology and Nature

Pseuderanthemum latifolium (Vahl.) B. Hansen, a rare member of Acanthaceae, was relocated from Mahavinayak, a sacred hill forest in Jajpur district, coastal Odisha, India, during floristic exploration of the family Acanthaceae. The species has previously been treated in regional literature as Pseuderanthemum malabaricum (C.B. Clarke) Gamble, now regarded as a synonym of P. latifolium. Earlier documentation from Odisha was associated with the Northern Circars, including Ganjam district, and recent field observations indicate its relocation in the state after about 30 years. The present note provides an updated taxonomic account based on field collection, examination of vegetative and reproductive characters, comparison with herbarium material and consultation of relevant literature and online databases. The plants were observed growing sporadically in shaded rock crevices under forest canopy, and only three to four individuals were recorded at the study site. Diagnostic characters, phenology, habitat and ecology, systematic position, distributional notes, a colour photo plate and photomicrographs are presented to support reliable identification and future comparison in subsequent surveys. A preliminary threat assessment was also undertaken using the Geospatial Conservation Assessment Tool by incorporating 139 GBIF occurrence points and two user points. The estimated extent of occurrence was 55,097,853.217 km², while the area of occupancy was 336.000 km². On the basis of Criterion B1, the taxon falls under Least Concern, whereas Criterion B2 indicates Endangered status. Considering the restricted and sporadic occurrence observed in Odisha, the study emphasises the need for continued field verification, habitat monitoring and site-level conservation attention for this species in coastal Odisha.