identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
96DC8AFF70085FBE9E6E7AD45227D514.text	96DC8AFF70085FBE9E6E7AD45227D514.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Didymocarpus xuanlienensis T. S. Hoang, W. G. Wang & H. C. Xi 2026	<div><p>Didymocarpus xuanlienensis T. S. Hoang, W. G. Wang &amp; H. C. Xi sp. nov.</p><p>Fig. 1</p><p>Type.</p><p>Vietnam • Thanh Hoa Province, Thuong Xuan Commune, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=105.03333&amp;materialsCitation.latitude=20.016666" title="Search Plazi for locations around (long 105.03333/lat 20.016666)">Xuan Lien Nature Reserve</a>, in evergreen forest on wet rocks, 574 m a. s. l., 20°01'N, 105°02'E, 22 December 2025, Son Thanh Hoang, XL 5316 (holotype: VAFS; isotype: VAFS) .</p><p>Diagnosis.</p><p>The new species differs from the most similar species, Didymocarpus brevipedunculatus Y. H. Tan &amp; Bin Yang, (2019: 191), in leaf blade elliptic to oblong, base cuneate (vs. ovate, base extremely obliquely cordate); bracts broadly ovate, glabrous (vs. orbicular to ovate, sparsely villous); calyx broadly campanulate, lobes triangular (vs. campanulate, lobes ovate to semiorbicular). D. xuanlienensis is also similar to D. purpureobracteatus W. W. Smith, (1912: 153) but differs from it in peduncle glandular-pubescent (vs. glabrous); bracts free (vs. often connate at base); calyx actinomorphic, broadly campanulate, lobes triangular (vs. slightly zygomorphic, tubular campanulate, lobes semiorbicular). Moreover, the new species differs from D. brevipedunculatus and D. purpureobracteatus in distribution, elevation, and flowering time. A detailed morphological and ecological comparison of these three species is presented in Table 1.</p><p>Description.</p><p>Herbs perennial, lithophytic, up to 50 cm tall. Stems erect, appressed pubescent. Leaves opposite; petiole 1.1–1.7 cm long, appressed pubescent; blade herbaceous, elliptic to oblong, 12.5–19.5 × 5.5–7 cm, base cuneate, often oblique, apex acuminate, margin serrate to subentire, adaxially dark green, appressed pubescent, abaxially light green, appressed pubescent; venation pinnate, lateral veins 7–9 pairs. Inflorescences terminal or subterminal, cymose, 7–15 - flowered; peduncles 3.5–6 cm long, glandular-pubescent; bracts paired, green, broadly ovate, 3–5 mm long, 4–6.5 mm wide, glabrous on both surfaces. Pedicel 4–18 mm long, glandular-pubescent. Calyx actinomorphic, broadly campanulate, ca. 5 mm long, shallowly 5 - lobed, outside red to light green, glabrous, inside light green; lobes bent outward, equal, triangular, ca. 1.5 mm long, 2.5 mm wide. Corolla 3.3–3.9 cm long, white, with 15 longitudinal pink striations extending from corolla tube to lobes, glabrous on both surfaces; tube infundibuliform-tubular, 2.1–2.6 cm long; upper lip 2 - lobed, lobes round, ca. 4 mm long, 6 mm wide; lower lip 3 - lobed, lobes subround, lateral lobes ca. 5 mm long, 6 mm wide, central lobe ca. 5 mm long, 6.5 mm wide. Stamens 2, adnate to ca. 1.5 cm above the corolla base; filaments ca. 1 cm long, glabrous; anthers coherent, ca. 3 mm long, pale yellow, villous. Staminodes 3, linear, lateral staminodes 2–4 mm long, central staminode ca. 3 mm long, adnate to 1.5–2 cm above the corolla base. Disc cupular, ca. 2 mm high. Pistil 2.2–2.5 cm long; ovary linear, 1.8–2.1 cm long, glabrous; style 2–3 mm long, sparsely pubescent to subglabrous; stigma capitate. Capsules not seen.</p><p>Etymology.</p><p>The specific epithet “ xuanlienensis ” refers to the type locality in Xuan Lien National Park, Vietnam. A Vietnamese name is proposed here as “ Song qu ả Xuân Liên ”.</p><p>Phenology.</p><p>Flowering from October to December.</p><p>Distribution and habitat.</p><p>Currently, this species is known only from the type locality, where it grows on moist rocks within an evergreen forest at an elevation of ca. 574 m.</p><p>Conservation assessment.</p><p>Only a single population with fewer than 20 mature individuals of Didymocarpus xuanlienensis has been recorded to date. The extent of occurrence (EOO) is less than 100 km 2, and the area of occupancy (AOO) is less than 10 km 2. However, this population and its habitat are well protected within Xuan Lien National Park, with no signs of human disturbance, and are not expected to be subject to any human interference or destruction in the foreseeable future. Consequently, following the IUCN Red List Categories and Criteria (IUCN Standards and Petitions Committee 2024), its threat status is currently assessed as “ Critically Endangered ” (CR) (B 1 B 2 aD).</p><p>Key to the species of Didymocarpus in Vietnam</p></div>	https://treatment.plazi.org/id/96DC8AFF70085FBE9E6E7AD45227D514	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Tran, Van Thi Thuy;Hoang, Son Thanh;Wang, Wen-Guang;Lang, Xiao-An;Xi, Hou-Cheng	Tran, Van Thi Thuy, Hoang, Son Thanh, Wang, Wen-Guang, Lang, Xiao-An, Xi, Hou-Cheng (2026): Didymocarpus xuanlienensis, a new species of Didymocarpus (Gesneriaceae) from Vietnam. PhytoKeys 275: 73-79, DOI: 10.3897/phytokeys.275.185766
