Argostemma sawmlianae (Rubiaceae, Argostemmateae), a new species from Northeast India under the Indo-Burma Hotspot

By

Lalhlupuii, Margaret
Tlanhlui, Lal
Khomdram, Sandhyarani Devi
Yumkham, Sanatombi Devi

Type

Article

Date of Publication

2025-11-25

Original Publication

PhytoKeys

Volume

266

Pages

317--328

Subjects

Argostemma , Indo-Burma hotspot , Mizoram , molecular , Morphology , new species

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.266.162537

 

Abstract

<br> Argostemma sawmlianae<br> (Rubiaceae), a new species from Mizoram, Northeast India, within the Indo-Burma hotspot, is described and illustrated. The species is compared with its allied species<br> A. courtallense<br> and<br> A. sarmentosum<br> , from which it differs by a set of distinctive morphological characters that include a pair of larger sessile leaves (11.5–18.5 cm long), longer peduncle (4–6.5 cm long), more flowers per cyme (8–33) and campanulate corolla with falcate lobes, reflexed and prominently rolled backward. The molecular analyses based on<br> matK<br> (cpDNA) and ITS2 (nrDNA) sequences support the morphological evidences confirming<br> A. sawmlianae<br> as a distinct new species. The newly discovered species is provisionally categorized as Critically Endangered (CR) in accordance with the IUCN Red List Categories and Criteria (IUCN 2024) based on available data.<br>