taxonID	type	description	language	source
03FF1A042417FFAFFE1525D8FC39492C.taxon	description	urn: lsid: ipni. org: names: 77217798 - 1 Figs 1 – 2	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042417FFAFFE1525D8FC39492C.taxon	diagnosis	Diagnosis Sonerila erectifolia sp. nov. is similar to Sonerila violifolia in its scorpioid or subumbelliform inflorescence, but it differs in the length of stem (ca 1 cm long in S. erectifolia sp. nov. vs 10 – 18 cm long in S. violifolia), the venation of the leaves (2 veins running from the base of lamina vs pinnately veined with 2 – 3 lateral primary veins), hairiness of leaves (sparsely covered with whitish hairs on veins abaxially vs glabrous), the length of the petiole (6 – 10 cm long vs 1 – 7 cm long), and number of flowers per inflorescence (5 – 12 (– 18) flowers vs 1 – 9 flowers). For further comparison see Table 1.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042417FFAFFE1525D8FC39492C.taxon	materials_examined	Material examined Type LAOS • Champasak Province, Dong Hua Sao National Protected Area, near Nong Luang Village, on rocks in open grassland at the summit of the Bolaven Plateau; at 1230 – 1270 m a. s. l.; 17 Sep. 2020; Souladeth, Souvannakhoummane, Phonepaseuth & Vongthavone L 3950; holotype: FOF!; isotypes: BKF, E, KAG. Paratype LAOS • Champasak Province, Dong Hua Sao National Protected Area, near Nong Luang temple, on rocks in open grassland; 1154 m a. s. l.; 16 Sep. 2020; Souladeth, Souvannakhoummane, Phonepaseuth & Vongthavone L 3823; E, FOF!, HNL, KAG.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042417FFAFFE1525D8FC39492C.taxon	etymology	Etymology The specific epithet refers to the plant having erect leaves.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042417FFAFFE1525D8FC39492C.taxon	vernacular_names	Vernacular name ຊ ີ ດ ິ ນໃບຕ ັ ້ ງ [ʻSeedin Baitungʼ (meaning: ʻ Sonerila with erect leavesʼ)].	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042417FFAFFE1525D8FC39492C.taxon	description	Description Herbs acaulescent or with a short rhizomatous stem, 10 – 14 (– 20) cm tall including inflorescences. Rhizome cylindrical, 2 – 3 cm long and 5 – 10 mm in diam, covered with long blonde hairs, hairs 3 – 4 mm long. Leaves simple, forming a basal rosette, erect; lamina elliptic-oblong, ovate-elliptic, 4 – 6 × 2 – 2.5 cm, membranous, green, sparsely covered with whitish hairs on margin and tip adaxially, pale green, sparsely covered with whitish hairs on veins abaxially, apex mucronate or rounded, base cuneate or attenuate (to truncate), margin finely crenate and sparsely long ciliate, with 2 pairs of primary lateral veins arising from base of lamina; petiole 6 – 10 cm long, light green to reddish-brown, sparsely covered with long pale green hairs. Inflorescence terminal, scorpioid cyme or subumbelliform cymes, 5 – 12 (– 18) - flowered; peduncle 10 – 15 cm long, 2 – 2.5 mm in diam., glabrous to sparsely hairy. Bracts minute. Hypanthium cylindrical, 8 – 9 mm long, 2 mm in diam., reddish brown, glabrous, Calyx lobes 3 (or rarely 4), triangular, ca 1 × 2.5 mm, apex short acuminate; pedicel 6 – 12 mm long, 0.9 – 1 mm in diam., glabrous. Petals 3 (or rarely 4), elliptic-oblong, 9 – 11 × 5 – 6 mm, pinkish purple to light pink, rarely white adaxially, pearl pink abaxially tinged with dark pink along midvein. Stamens 3 (or rarely 4), anthers lanceolate, 7 – 8 mm long, curved, basally inflated and deeply cordate, bright yellow; filaments 6 – 8 mm long, glabrous, usually pale pink. Ovary 3 - locular (or rarely 4), ellipsoid, style 11 – 13 mm long, glabrous, pale pink, sometimes pale green to white, stigma capitate, glabrous, white. Fruits and Seeds not seen.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042417FFAFFE1525D8FC39492C.taxon	distribution	Distribution, habitat and phenology Sonerila erectifolia Phonep., Soulad. & Tagane sp. nov. grows on exposed, open, moss-covered bedrock on the Bolaven Plateau, where it is found together with Boesenbergia burttii (K. Larsen & Jenjitt.) Mood & L. M. Prince (Zingiberaceae Martinov) and several fern species including Oleandra undulata (Willd.) Ching (Oleandraceae Ching ex Pic. Serm.), Nephrolepis cordifolia (L.) K. Presl (Nephrolepidaceae Pic. Serm.), and Leucostegia truncata (D. Don) Fraser-Jenk (Hypodematiaceae Ching), at 1230 – 1270 m a. s. l. Flowering in September.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042417FFAFFE1525D8FC39492C.taxon	conservation	Preliminary conservation status Sonerila erectifolia Phonep., Soulad. & Tagane sp. nov. is found only at the top of the Bolaven Plateau (near Nong Luang Village). The number of mature individuals is estimated to be fewer than 250, which together generate an area of occupancy of less than 10 km 2. The area is a well-known tourist attraction with associated habitat disturbance that could affect the survival of this species. Therefore, we assess the species as Critically Endangered (CR) B 2 ab (iii) (IUCN 2019).	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042413FFADFDC02668FE7B4BCA.taxon	description	urn: lsid: ipni. org: names: 77217799 - 1 Figs 3 – 4	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042413FFADFDC02668FE7B4BCA.taxon	diagnosis	Diagnosis Sonerila souvannii sp. nov. is similar to S. cardamomensis, described from Cambodia, in its acaulescent habit and in the shape of its leaves, but it differs in the shape of its rhizome (cylindrical in S. souvanii vs bulbous in S. cardamomensis), larger leaves (8 – 10 × 6 – 9 cm vs 1 – 4 × 0.9 – 2.7 cm), petiole length and color (8 – 15 cm long and light green vs 0.4 – 2.5 cm long and reddish brown), greater number of flowers per cyme (20 – 25 vs 5 – 11), and petal length and pubescence (9 – 10 × 6 – 7 mm and glabrous vs 5.5 – 6 × 3.5 – 4 mm with glandular trichomes on midveins abaxially). Sonerila souvannii sp. nov. is also similar to S. dongnathamensis from Thailand in the shape of its inflorescences, but differs in the rhizome shape (cylindrical vs globose), the shape of the leaf base (cordate vs obtuse to rounded), pedicel length (10 – 25 mm long vs 1 – 4 mm long), the number of flowers per cyme (20 – 25 vs 5 – 12), and in the length and outline of the petals (9 – 10 × 6 – 7 mm, acute vs 3 – 5 × 3 – 4 mm, acuminate with long seta). The new species is also related to S. tuberosa from Cambodia, but distinguished in the rhizome shape (cylindrical vs slightly bulbous), the shape of the leaf base (cordate vs very broadly ovate to orbicular), pedicel length (10 – 25 mm long vs 5 – 6 mm long), the number of flowers per cyme (20 – 25 vs 4 – 8), and in the length and outline of the petals (9 – 10 × 6 – 7 mm, acute vs 5 × 2.7 mm, elliptic, apiculate, pink) (Table 2).	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042413FFADFDC02668FE7B4BCA.taxon	materials_examined	Material examined Type LAOS • Vientiane Capital, Naxaythong District, Darn Sinxay temple area; 210 m a. s. l.; 12 Sep. 2020; Phonepaseuth P 012; holotype: FOF!; isotypes: HNL, KAG.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042413FFADFDC02668FE7B4BCA.taxon	etymology	Etymology The specific epithet honours Keooudone Souvannakhoummane (Centre for Development and Environment), a plant taxonomist who has greatly contributed to our understanding of plant diversity in Laos through the description of many new species in various families for the flora of Laos.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042413FFADFDC02668FE7B4BCA.taxon	vernacular_names	Vernacular name ຊ ີ ດ ິ ນສ ຸ ວ ັ ນ [ʻSouvan’s Seedinʼ (meaning: ʻSouvan’s Sonerila ʼ)].	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042413FFADFDC02668FE7B4BCA.taxon	description	Description Lithophytic perennial herb, 12 – 15 cm tall. Stem cylindrical, ca 2 cm long, 8 – 10 mm in diam., with a rhizome at the base, rhizome green when young then turning to brown with age, with rudimentary leaves on buds on the rhizome. Leaves forming a basal rosette; lamina (ordinary leaves) ovate, 8 – 10 × 6 – 9 cm, membranous when dried, green, covered with hirsute hairs adaxially, pale green, covered with whitish hirsute hairs mainly along the veins abaxially, apex acute, base cordate, margin finely crenate and long ciliate, midrib sunken abaxially, with 4 – 5 pairs of lateral primary veins originating from a common point at the base, impressed adaxially, prominent abaxially; petiole 8 – 15 cm long, light green, densely villous except near base which is glabrous. Rudimentary leaves ovate, 0.2 – 0.6 cm long, with long spike hairs. Inflorescence terminal, scorpioid cyme, 20 – 25 - flowered, of which 2 – 3 flowering at a time; peduncle 8 – 12 cm long, 2 – 2.5 mm in diam., sparsely covered with villous hairs. Bracts rachis and minute. Hypanthium greenish pink, campanulate, 5 – 6 mm long, 2 – 2.5 mm in diam., sparsely covered with villous hairs, Calyx lobes 3, ovate-triangular, ca 1 × 2.5 mm, apex short acuminate; pedicel 1 – 2.5 cm long, 0.8 – 1 mm in diam., sparsely covered with glandular trichomes. Petals 3, elliptic, 9 – 10 × 6 – 7 mm, pinkish purple adaxially, pale pink tinged with shiny green, with a pinkish purple line along the midrib abaxially. Stamens 3, anthers lanceolate, 5.5 – 6 mm long, bright yellow, basally inflated and deep cordate, filaments 6 – 7 mm long, glabrous, white. Ovary 3 - locular, elliptical, placentation axillary, style 10 – 12 mm long, glabrous, white, stigma capitate. Capsule ovoid-ellipsoid, 5 – 7 × 2.5 mm, smooth outside. Seeds brown, numerous.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042413FFADFDC02668FE7B4BCA.taxon	distribution	Distribution, habitat and phenology Sonerila souvannii sp. nov. grows in loose soil in the crevices of shaded rocks at 200 – 210 m a. s. l. It grows in the understorey of lowland semi-evergreen forest together with Begonia martabanica A. DC. (Begoniaceae C. Agardh), Phyllagathis tuberosa (C. Hansen) Cellin. & S. S. Renner (Melastomataceae Juss.) and Davallia denticulata (Burm. f.) Mett. ex Kuhn (Davalliaceae M. R. Schomb. ex A. B. Frank). Flowering and fruiting in September.	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
03FF1A042413FFADFDC02668FE7B4BCA.taxon	conservation	Preliminary conservation status We found three small sub-populations of S. souvannii sp. nov. with each comprising only 5 – 6 individuals, about 20 m apart. The species has not yet been found anywhere else. Considering the species grows in a very narrowly restricted area where human activity, such as collection of non-timber forest products (NTFPs) and the logging of wood for local uses, can be seen, we need to pay attention to its conservation. As the number of mature individuals is less than 50, we assess this species as Critical Endangered (CR) criteria D (IUCN 2019).	en	Phonepaseuth, Phongphayboun, Souladeth, Phetlasy, Souvannakhoummane, Keooudone, Vongthavone, Thyraphon, Tagane, Shuichiro (2021): Two new species of Sonerila Roxb. (Melastomataceae) from Laos. European Journal of Taxonomy 755: 136-148, DOI: https://doi.org/10.5852/ejt.2021.755.1403, URL: http://dx.doi.org/10.5852/ejt.2021.755.1403
