taxonID	type	description	language	source
DA3B4D6911EB55A9BB7064038CB0C553.taxon	description	Figs 1, 2, 3	en	Lalhlupuii, Margaret, Tlanhlui, Lal, Khomdram, Sandhyarani Devi, Yumkham, Sanatombi Devi (2025): Argostemma sawmlianae (Rubiaceae, Argostemmateae), a new species from Northeast India under the Indo-Burma Hotspot. PhytoKeys 266: 317-328, DOI: 10.3897/phytokeys.266.162537
DA3B4D6911EB55A9BB7064038CB0C553.taxon	diagnosis	Diagnosis. It is similar to Argostemma courtallense Arn. and A. sarmentosum Wall., but differs from the two in having one 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 petals which are reflexed and strongly rolled backwards (Fig. 3, Table 1).	en	Lalhlupuii, Margaret, Tlanhlui, Lal, Khomdram, Sandhyarani Devi, Yumkham, Sanatombi Devi (2025): Argostemma sawmlianae (Rubiaceae, Argostemmateae), a new species from Northeast India under the Indo-Burma Hotspot. PhytoKeys 266: 317-328, DOI: 10.3897/phytokeys.266.162537
DA3B4D6911EB55A9BB7064038CB0C553.taxon	description	Description. Epilithic, perennial herb, 7 – 17 cm tall, attached to substratum with dense, much-branched, non-tuberous matted roots. Stem semi-erect, terete, unbranched, 1.5 – 7 cm long, greenish white, pubescent. Leaves opposite, strongly anisophyllous, paired, sessile, reticulate eucamptodromous, secondary veins 6, ovate, 11.5 – 18.5 × 10 – 13.3 cm, base cordate, margin entire, apex acute, pubescent on both sides; small pair of rudimentary leaves, sessile, broadly ovate to elliptic, 3 – 7 × 3 – 4 mm, green, pubescent. Stipule sessile, ovate, 5 – 7 × 3 – 4 mm, base cordate, apex acute, green, margin pubescent. Inflorescence umbelliform, flowers basipetal, single, rarely 2 – 4, 8 – 33 flowered. Bracts foliaceous, 4 – 6, fused, unequal size, whorled, elliptic to ovate, 8 – 11 × 4 – 6 mm, green, margin pubescent, whorled, isomorphic with number of inflorescences (1 – 4); peduncle 4 – 6.5 cm long, greenish white, glabrous. Flowers pedicellate, 4 - merous, actinomorphic, 1.8 – 2.2 cm, pedicel 7 – 10 mm long, white, pubescent. Calyx 4 - lobed, lobes basally connate, ovate, 6 – 10 × 4 – 5 mm, petaloid, white, calyx teeth tip green, become completely green after anthesis, glabrous. Corolla 4, white, falcate, 6 – 8 × 2 – 3 mm; ¾ lobes reflexed, tube green blotched, 1 – 2 × 1 – 3 mm, tuff haired at tip of corolla lobe. Stamens 4, equal, anthers free, loosely arranged, basifixed, 6 mm long, yellow, exserted from the corolla tube, glabrous; filaments 2 – 3 mm, free, S-like curvature, white. Style 1 – 1.2 cm long, white, glabrous; stigma club shaped, yellow; ovary inferior, bilocular, axile placentation, hairy; ovule numerous, yellow. Seeds numerous, minute, triangular, 600 × 300 μm, black, testa reticulate, central mamilla in each cavity (Fig. 2 D, E).	en	Lalhlupuii, Margaret, Tlanhlui, Lal, Khomdram, Sandhyarani Devi, Yumkham, Sanatombi Devi (2025): Argostemma sawmlianae (Rubiaceae, Argostemmateae), a new species from Northeast India under the Indo-Burma Hotspot. PhytoKeys 266: 317-328, DOI: 10.3897/phytokeys.266.162537
DA3B4D6911EB55A9BB7064038CB0C553.taxon	distribution	Distribution and ecology. The plant was found growing on a damp rock-wall along a stream with mosses, pteridophytes (Selaginella sp., Asplenium sp.) and Begonia spp. (Begoniaceae). The plant was collected from Lungleng village in Aizawl District of Mizoram, India which is located at 23 ° 39 ' 57 " N, 92 ° 39 ' 41 " E, south of Aizawl city. Positioned at an elevation of 1011 m above sea level, Lungleng receives an average annual rainfall of about 2500 mm, with temperature ranging from 26 ° C – 31 ° C. The settlement lies atop a hill and is encircled by a narrow belt of dense community reserve forest comprising subtropical broad-leaved evergreen mixed forest and with patches of secondary forest surrounding the reserved area.	en	Lalhlupuii, Margaret, Tlanhlui, Lal, Khomdram, Sandhyarani Devi, Yumkham, Sanatombi Devi (2025): Argostemma sawmlianae (Rubiaceae, Argostemmateae), a new species from Northeast India under the Indo-Burma Hotspot. PhytoKeys 266: 317-328, DOI: 10.3897/phytokeys.266.162537
DA3B4D6911EB55A9BB7064038CB0C553.taxon	etymology	Etymology. The specific epithet sawmlianae is to honour Mal Sawmliana, a forest conservator and naturalist, as a recognition of his efforts and contribution in exploring the flora and fauna for conservation measures in Mizoram.	en	Lalhlupuii, Margaret, Tlanhlui, Lal, Khomdram, Sandhyarani Devi, Yumkham, Sanatombi Devi (2025): Argostemma sawmlianae (Rubiaceae, Argostemmateae), a new species from Northeast India under the Indo-Burma Hotspot. PhytoKeys 266: 317-328, DOI: 10.3897/phytokeys.266.162537
