Didymocarpus janakiae (Gesneriaceae), a new species from the eastern Himalayas, India

S. B. Rhuthuparna and Vinita Gowda

Nordic Journal of Botany 2024: e04353

ABSTRACT:We describe a new species, Didymocarpus janakiae Rhuthuparna & V.Gowda from the eastern Himalayas of India. We provide a detailed description of the species’ morphology, diagnostic characters, and colour photographs to support its classification as a new taxon. The new species shows morphological affinities with D. middletonii Souvann., Soulad. & Tagane, D.cinereus D.Don, and D. punduanus var. pulchrus (C. B. Clarke) Su.Datta & B.K.Sinha. It is similar to D. middletonii in its calyx shape but can be distinguished by its glabrous calyx and glandular hairy corolla (versus calyx sparsely covered with multi-cellular hairs and glabrous corolla). Similarly, it resembles D. punduanus var. pulchrus and D. cinereus D.Don in the shape and purplish colour of the corolla, but D. janakiae can be distinguished from these two species by its urceolate calyx (versus campanulate), and longer calyx tube (6.7–10.4 mm versus ca 6 mm in D. cinereus and 3–6 mm in D. punduanus var. pulchrus). Currently D. janakiae is only known from its type locality, therefore we assess it as Critically Endangered as per the IUCN guidelines.

Keywords: Arunachal Pradesh, Didymocarpoideae, Janaki Ammal, northeast India

Original article link: doi: 10.1111/njb.04353