identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
5F8DB2B4A73A559E9552699968637B3D.text	5F8DB2B4A73A559E9552699968637B3D.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Perilimnastes dongchauensis C. H. Nguyen, D. V. Nam & C. W. Lin 2026	<div><p>Perilimnastes dongchauensis C. H. Nguyen, D. V. Nam &amp; C. W. Lin sp. nov.</p><p>Figs 1, 2, 3</p><p>Type.</p><p>Vietnam • Quang Tri province, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=106.71667&amp;materialsCitation.latitude=16.990278" title="Search Plazi for locations around (long 106.71667/lat 16.990278)">Kim Ngan commune</a>, primary and old secondary evergreen broad-leaved forest, at elevations of 100–200 m a. s. l., along streams and on stream valley slopes in wet rocky places with soil rich in humus, around point 16°59'25"N, 106°43'00"E, locally common, 8 July 2025, Nguyen Huu Cuong, Duong Van Nam, Tran The Hung, Phan Thanh Quyet, Le Khanh Vu NHC 250708040 (holotype: VNF!; isotypes: VNF!, LE!) .</p><p>Diagnosis.</p><p>Perilimnastes dongchauensis resembles P. suberalata (C. Hansen) Ying Liu (Hansen 1990; Liu et al. 2024) in having elliptic-lanceolate leaf blades, few-flowered inflorescences, 4 - merous flowers, and similar anther morphology. However, it differs in several key characters, with stems and petioles densely setose (vs. glabrous), leaves equal or subequal in a pair (vs. unequal, rarely subequal) and adaxial surface setose (vs. glabrous), hypanthia setose (vs. glabrous), calyx lobes narrowly triangular (vs. linear), and petals much larger, measuring 20 × 18 mm (vs. 6 × 3.5 mm).</p><p>Description.</p><p>Lithophytic, suberect to ascending, multi-branched shrublets to 80 cm or taller, with raphides in many parts. Stems olive green to brownish-red, becoming woody and pale grayish-brown with age; obtusely quadrangular in cross-section, internodes (0.3 –) 1–3 (– 7) cm long, 2–3.5 mm thick in distal branches, up to 7 mm or more in the lower stems, minute glandular trichomes mixed with moderately to densely golden brown strigose (1–3 mm long), glabrescent. Leaves simple, decussate and held horizontally, equal to subequal in a pair; petiole olive green to brownish-red, 8–50 mm long, oblate in cross-section, grooved above, minute glandular trichomes mixed with densely golden brown strigose; leaf blade oblanceolate to obovate-lanceolate, 5–16 × 1.5–5 cm, chartaceous, adaxial surface dark green, sparsely golden brown strigose (ca. 1.5 mm long) between veins; abaxial surface pale green, minute glandular trichomes mixed with sparsely golden brown strigose along veins; base cuneate to attenuate, apex attenuate-acuminate to acuminate-caudate, margin inconspicuous coarsely serrate, each tooth tipped by a strigose hair; venation acrodromous, with 3 primary veins originating from the base, slightly prominent to flat on the adaxial surface and prominent on the abaxial surface, secondary and tertiary veins conspicuous on the abaxial surface. Inflorescences terminal, umbellate cymes with 3–6 flowers; peduncles sessile or subsessile, bearing a single pair of leaf-like bracts; bracts 6–15 × 2–5 mm. Flowers 4 - merous; pedicel greenish white tinged pink towards base, terete, 10–15 mm long in flower, up to 18 mm long in fruit, glabrous. Hypanthium funnel-shaped, greenish white; 5–7 mm long, 5–6 mm in diameter, minute brown glands mixed with moderately to densely golden brown strigose or tuberculate-base strigose. Sepals 4, very narrowly triangular to linear-triangular, greenish white tinged green towards apex, 10–12 mm long, 1.2–1.5 mm wide at the middle and ca. 3 mm wide at the base, adaxially minute glandular trichomes mixed with golden brown strigose, margins subentire with rows of strigose indumentum. Petals 4, bright pink adaxially, pinkish white abaxially, broadly obovate-oblong, slightly oblique, 17–20 × 13–18 mm, glabrous. Stamens 8, isomorphic, glabrous, filamentous, all anthers grouped together above the stigma; filaments subterete, ca. 10 mm long, white; anthers subulate, strongly incurved, 6.5–8 mm long (appendages included), creamy white tinged with yellow towards the base; ventrally with a pair of bright yellow, tuberculate lobes at the base of the anther sacs; connective dorsally forming a ca. 0.3 mm long spur and ventrally bearing a truncate appendage, sometimes retuse at the middle, nearly forked into two triangular lobes; apically with one pore. Ovary ca. 1 / 3 as long as hypanthium (crown excluded), 1.5–2 mm long, 4 - locular; ovary crown wedge-like, 4 - lobed, margin denticulate, 1.2–1.5 mm high; ovules numerous; ovary adnate to hypanthium for 1–2 mm. Style filiform, white, 1.8–2.2 cm long; stigma obscurely capitate. Capsule cup-shaped, 6.5–8 × 5–7 mm, quadrangular; hypanthium 8 - ribbed; crown enlarged enclosing an obpyramidal space; placental column unbeaked, 4 - horned; placenta thread-like. Seeds numerous, oblong-ovoid to narrowly triangular-oblongoid, (0.3 –) 0.6–0.8 mm long, 0.25–0.35 mm thick, brown.</p><p>Distribution.</p><p>Perilimnastes dongchauensis is currently known only from Quang Tri province, Central Vietnam, including Dong Chau-Khe Nuoc Trong Nature Reserve and Phong Nha-Ke Bang National Park.</p><p>Habitat.</p><p>Perilimnastes dongchauensis grows in primary and old secondary lowland, evergreen, broad-leaved forests dominated by Amesiodendron chinense (Merrill) Hu, Dillenia heterosepala Fin. &amp; Gagnep., Syzygium attopeuense (Gagnep.) Merr. &amp; LMPery, and Elaeocarpus hainanensis Oliver, Impatiens claviger J. D. Hooker, along streams and stream valley slopes in wet rocky places with soil rich in humus at elevations of 100–750 m a. s. l., locally common.</p><p>Phenology.</p><p>Flowering from June to November, fruiting from July to December.</p><p>Etymology.</p><p>The species is named after its type locality, Dong Chau-Khe Nuoc Trong Nature Reserve.</p><p>Vietnamese names.</p><p>Me đá đ ộng châu.</p><p>Preliminary IUCN conservation status.</p><p>The species was found in some locations as a common plant, able to grow well in secondary and primary forests in the territory that is currently officially protected. According to the criteria and terms of the Red List IUCN (2024) we preliminarily estimate the conservation status of P. dongchauensis as being of least concern (LC).</p><p>Note.</p><p>Within the Sino-Vietnamese region, P. dongchauensis shows some resemblance to P. elegans (Hai L. Chen, Yan Liu &amp; Ying Liu) Ying Liu (Chen et al. 2021; Liu et al. 2024), sharing a hairy stem, oblanceolate 3 - veined, leaves setose on the adaxial surface, and an umbellate inflorescence and flowers with pink petals. However, it can be readily distinguished from P. elegans by its setose stems (vs. crooked hairs), consistently 4 - merous flowers (vs. usually 3 - merous), much shorter peduncles (0.3–0.6 mm vs. 15–27 mm), setose hypanthia (vs. glandular), whitish yellow anthers (vs. purple), and a truncated, ventral connective appendage (vs. absent).</p><p>Additional material studied (paratypes).</p><p>Vietnam • Quang Tri province: <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=106.71667&amp;materialsCitation.latitude=16.983334" title="Search Plazi for locations around (long 106.71667/lat 16.983334)">Kim Ngan commune</a>, old secondary evergreen broad-leaved forest, at elevation ca. 150 m a. s. l., along streams, around point 16°59'00"N, 106°43'00"E, locally common, 8 October 2025, Cao Xuan Tuan, Bach Thanh Hai, DCKNT-NR 251008002 (VNF) ; • <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=106.37906&amp;materialsCitation.latitude=17.47264" title="Search Plazi for locations around (long 106.37906/lat 17.47264)">Phong Nha-Ke Bang National Park</a>, ca. 700 m a. s. l., around point 17°28'21.5"N, 106°22'44.6"E, 27 November 2025, T. C. Hsu 16510 (SGN, TAIF) .</p></div>	https://treatment.plazi.org/id/5F8DB2B4A73A559E9552699968637B3D	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	Huu Nguyen, Cuong;Duong, Nam Van;Bui, Doi The;Tran, Hung The;Bach, Hai Thanh;Phan, Quyet Thanh;Le, Vu Khanh;Nguyen, Duong Tuan;Nuraliev, Maxim S.;Averyanov, Leonid V.;Lin, Che Wei	Huu Nguyen, Cuong, Duong, Nam Van, Bui, Doi The, Tran, Hung The, Bach, Hai Thanh, Phan, Quyet Thanh, Le, Vu Khanh, Nguyen, Duong Tuan, Nuraliev, Maxim S., Averyanov, Leonid V., Lin, Che Wei (2026): Perilimnastes dongchauensis (tribe Sonerileae, Melastomataceae), a new species from Quang Tr ị province, Vietnam. PhytoKeys 273: 109-117, DOI: 10.3897/phytokeys.273.177749
