Polyalthia esanensis Wiya, Damth. & Chaowasku 2025, sp. nov.
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| author | Wiya, Chattida Damthongdee, Anissara Chanthamrong, Kithisak Ue-Aree, Phasit Chaowasku, Tanawat |
| author_facet | Wiya, Chattida Damthongdee, Anissara Chanthamrong, Kithisak Ue-Aree, Phasit Chaowasku, Tanawat |
| contents | <p><i>Polyalthia esanensis</i> Wiya, Damth. & Chaowasku sp. nov.</p><p>urn:lsid:ipni.org:names:77365546-1</p><p>Figs 1, 6–7, 12; Table 3</p><p><b>Diagnosis</b></p><p>Morphologically most similar to <i>P. chantaranothaii</i> and <i>P. acuminatissima</i> sp. nov. (another new species described below; = <i>P. evecta</i> -4), but can be chiefly distinguished from the two by different combinations of traits (indumentum on young twigs, leaf texture, length of leaf acumen and outer petal length) as shown in Table 3.</p><p><b>Etymology</b></p><p>Named after ʻEsan', an informal name for eastern and northeastern regions of Thailand where this species occurs.</p><p><b>Type material</b></p><p><b>Holotype</b></p><p>THAILAND • Amnat Charoen Province, Chanuman District, Khok Kong Subdistrict; Jul. 2019; fl.; <i>Chaowasku 225</i>; holotype: CMUB [CMUB004001101]; isotype: QBG.</p><p><b>Paratypes</b></p><p>THAILAND • Udon Thani Province, Nong Saeng District, Thap Kung Subdistrict; Jul. 2019; fl., fr.; <i>Chaowasku 226</i>; QBG • same data as for holotype; May 2022; fl., young fr.; <i>Chaowasku 230</i>; QBG.</p><p><b>Description</b></p><p>Treelets ca 1.5 m tall; young twigs tomentose-villous to villous, hairs erect only or appressed and erect. Petiole 2.0–4.0 mm long, velvety with mostly erect hairs, slightly grooved above; leaf blade chartaceous, elliptic to obovate, sometimes narrowly obovate, 7.9–15.8 × 2.5–4.3 cm, puberulous with appressed hairs above, puberulous-tomentose intermixed with pilose below, hairs appressed only or appressed and erect, base obtuse-subcordate to rounded-subcordate, rarely obtuse, apex caudately short-acuminate (acumen 6.0–9.0 mm) to acute-acuminate, rarely acute to obtuse; midrib slightly sunken to flat above, tomentose-villous with erect hairs, raised below, velvety with appressed and erect hairs; secondary veins 8–13 per side, rather distinct below, angle with midrib 50°–70° (at middle part of leaf blade). Inflorescences 1- to 4-flowered, terminal (developing to internodal or ±leaf-opposed); peduncle and rachis (when present) inconspicuous; pedicel 5.0–11.0 mm long, velvety with appressed and erect hairs, bearing 1 ovate-triangular bract. Sepals free, broadly ovate, 2.5–3.0 × 2.6–3.1 mm, outside and margin velvety with appressed and erect hairs, inside glabrous. Outer petals ovate to ovate-triangular, 5.5–5.8 × 3.0– 3.2 mm, outside tomentose with mostly appressed hairs, margin tomentose with appressed and erect hairs, inside glabrous, apex acute; inner petals ± pale yellow in vivo at maturity, ovate to ovate-elliptic, 9.7–10.5 × 3.8–4.2 mm, outside and margin tomentose with mostly appressed hairs, inside almost glabrous, apex ±acute. Stamens 60–84 per flower, 1.2–1.6 mm long, connective apex truncate, covering thecae. Carpels 7–13 per flower, 1.8–2.0 mm long; stigmas ± obovoid; ovaries tomentose with appressed hairs; ovule 1 per ovary, basal. Torus depressed subglobose. Each fruit consisting of up to 6 monocarps which are ±subglobose, 5.5–7.0 × 5.3–6.0 mm, smooth and puberulous with mostly appressed hairs, apex not apiculate, stipe 5.5–7.0 mm long, often slightly obliquely attached to monocarps, indumentum similar to that of monocarps but a bit denser; fruiting pedicel ca 17.0 mm long. Seed 1 per monocarp, subglobose, ca 6.0 × 5.5 mm.</p><p><b>Habitat and phenology</b></p><p>The new species occurs in partially disturbed deciduous forests, near a stream. The elevation is 150– 570 m. Flowering and fruiting material was collected in May and July.</p><p><b>Distribution</b></p><p>Eastern and northeastern Thailand.</p><p><b>Preliminary conservation assessment</b></p><p>Data Deficient (DD).</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_17370661 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Polyalthia esanensis Wiya, Damth. & Chaowasku 2025, sp. nov. Wiya, Chattida Damthongdee, Anissara Chanthamrong, Kithisak Ue-Aree, Phasit Chaowasku, Tanawat Biodiversity Taxonomy Plantae Tracheophyta Magnoliopsida Magnoliales Annonaceae Polyalthia Polyalthia esanensis <p><i>Polyalthia esanensis</i> Wiya, Damth. & Chaowasku sp. nov.</p><p>urn:lsid:ipni.org:names:77365546-1</p><p>Figs 1, 6–7, 12; Table 3</p><p><b>Diagnosis</b></p><p>Morphologically most similar to <i>P. chantaranothaii</i> and <i>P. acuminatissima</i> sp. nov. (another new species described below; = <i>P. evecta</i> -4), but can be chiefly distinguished from the two by different combinations of traits (indumentum on young twigs, leaf texture, length of leaf acumen and outer petal length) as shown in Table 3.</p><p><b>Etymology</b></p><p>Named after ʻEsan', an informal name for eastern and northeastern regions of Thailand where this species occurs.</p><p><b>Type material</b></p><p><b>Holotype</b></p><p>THAILAND • Amnat Charoen Province, Chanuman District, Khok Kong Subdistrict; Jul. 2019; fl.; <i>Chaowasku 225</i>; holotype: CMUB [CMUB004001101]; isotype: QBG.</p><p><b>Paratypes</b></p><p>THAILAND • Udon Thani Province, Nong Saeng District, Thap Kung Subdistrict; Jul. 2019; fl., fr.; <i>Chaowasku 226</i>; QBG • same data as for holotype; May 2022; fl., young fr.; <i>Chaowasku 230</i>; QBG.</p><p><b>Description</b></p><p>Treelets ca 1.5 m tall; young twigs tomentose-villous to villous, hairs erect only or appressed and erect. Petiole 2.0–4.0 mm long, velvety with mostly erect hairs, slightly grooved above; leaf blade chartaceous, elliptic to obovate, sometimes narrowly obovate, 7.9–15.8 × 2.5–4.3 cm, puberulous with appressed hairs above, puberulous-tomentose intermixed with pilose below, hairs appressed only or appressed and erect, base obtuse-subcordate to rounded-subcordate, rarely obtuse, apex caudately short-acuminate (acumen 6.0–9.0 mm) to acute-acuminate, rarely acute to obtuse; midrib slightly sunken to flat above, tomentose-villous with erect hairs, raised below, velvety with appressed and erect hairs; secondary veins 8–13 per side, rather distinct below, angle with midrib 50°–70° (at middle part of leaf blade). Inflorescences 1- to 4-flowered, terminal (developing to internodal or ±leaf-opposed); peduncle and rachis (when present) inconspicuous; pedicel 5.0–11.0 mm long, velvety with appressed and erect hairs, bearing 1 ovate-triangular bract. Sepals free, broadly ovate, 2.5–3.0 × 2.6–3.1 mm, outside and margin velvety with appressed and erect hairs, inside glabrous. Outer petals ovate to ovate-triangular, 5.5–5.8 × 3.0– 3.2 mm, outside tomentose with mostly appressed hairs, margin tomentose with appressed and erect hairs, inside glabrous, apex acute; inner petals ± pale yellow in vivo at maturity, ovate to ovate-elliptic, 9.7–10.5 × 3.8–4.2 mm, outside and margin tomentose with mostly appressed hairs, inside almost glabrous, apex ±acute. Stamens 60–84 per flower, 1.2–1.6 mm long, connective apex truncate, covering thecae. Carpels 7–13 per flower, 1.8–2.0 mm long; stigmas ± obovoid; ovaries tomentose with appressed hairs; ovule 1 per ovary, basal. Torus depressed subglobose. Each fruit consisting of up to 6 monocarps which are ±subglobose, 5.5–7.0 × 5.3–6.0 mm, smooth and puberulous with mostly appressed hairs, apex not apiculate, stipe 5.5–7.0 mm long, often slightly obliquely attached to monocarps, indumentum similar to that of monocarps but a bit denser; fruiting pedicel ca 17.0 mm long. Seed 1 per monocarp, subglobose, ca 6.0 × 5.5 mm.</p><p><b>Habitat and phenology</b></p><p>The new species occurs in partially disturbed deciduous forests, near a stream. The elevation is 150– 570 m. Flowering and fruiting material was collected in May and July.</p><p><b>Distribution</b></p><p>Eastern and northeastern Thailand.</p><p><b>Preliminary conservation assessment</b></p><p>Data Deficient (DD).</p> |
| title | Polyalthia esanensis Wiya, Damth. & Chaowasku 2025, sp. nov. |
| topic | Biodiversity Taxonomy Plantae Tracheophyta Magnoliopsida Magnoliales Annonaceae Polyalthia Polyalthia esanensis |
| url | https://doi.org/10.5281/zenodo.17370661 |