Two new species of Tetrastigma (Miq.) Planch. (Vitaceae) from Thailand Author Kochaiphat, Phongsakorn Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. & Email: phongsakorn. s @ gmail. com phongsakorn.s@gmail.com Author Trias-Blasi, Anna Royal Botanic Gardens Kew, Richmond, Surrey TW 9 3 AE, England, U. K. & Email: a. triasblasi @ kew. org a.triasblasi@kew.org Author Pornpongrungrueng, Pimwadee Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. & Corresponding author: ppimwa @ kku. ac. th ppimwa@kku.ac.th text European Journal of Taxonomy 2016 2016-05-30 201 1 12 journal article 21905 10.5852/ejt.2016.201 4ca65833-f67d-429c-9448-7bba127c917b 2118-9773 3840512 Key to the species of Tetrastigma in Thailand 1. Tendrils5–7palmately branched;leaves palmately3-foliolate........ T. triphyllum (Gagnep.)W.T.Wang – Tendrils simple or bifurcate; leaves simple, palmately 3–5(–7)-foliolate or pedately 5–7(–9)-foliolate ........................................................................................................................................................... 2 2. Inflorescences on old stems (cauliflorous plants), more than 5 inflorescences per nodes ..................... ............................................................................................................................. T. cauliflorum Merr. – Inflorescences on young branches, 1–3 inflorescences per nodes ...................................................... 3 3. Young branches with 4–5 sharp ridges ........................................ T. quadrangulum Gagnep. & Craib – Young branches round or nearly round .............................................................................................. 4 4. Leaves palmately 3–5(–7)-foliolate or mixed with simple leaves or all leaves simple ..................... 5 – Leaves pedately 5–7(–9)-foliolate rarely mixed with 3-foliolate ..................................................... 16 5. Stems verrucose or with corky protuberances ................................................................................... 6 – Stems smooth, pubescent or with flaky cork ...................................................................................... 8 6. Stems with corky protuberances; leaves ovate to elliptic; stigma distinctly 4-lobed ......................... 7 – Stems verrucose; leaves lanceolate; stigma peltate ............................................. T. harmandii Planch. 7. Leaves fleshly; stigma cruciform; berries ellipsoid when dry ............... T. cruciatum Craib & Gagnep. – Leaves coriaceous or papyraceous; stigma pointed lobes; berries pyriform when dry ......................... ......................................................................... T. assimile (Kurz) C.L.Li ex Kochaiph. & Trias-Blasi 8. Shrubs, creeping, erect or decumbent ................................................................................................ 9 – Lianas .............................................................................................................................................. 10 9. Leaves simple or mixed with palmately 3(–5)-foliolate; pedicel 0.4–0.6 cm long ............................... ....................................................................................................................... T. bambusetorum Craib – Leaves palmately 3-foliolate; pedicel 0.8–1.2 cm long .................................... T. apiculatum Gagnep. 10. Leaflets glabrous .............................................................................................................................. 11 – Leaflets pubescent or hirsute at least along the midrib on lower leaf surface ................................... 15 11. Female flower disc conspicuous, thick and adnate to lower part of ovary ........................................ 12 – Female flower disc inconspicuous ................................................................................................... 14 12. Terminal leaflets broadly elliptic to rhombic; berries pyriform when dry ............................................. .................................................................................. T. pedunculare (Wall. ex M.A.Lawson) Planch. – Terminal leaflets elliptic, ovate or lanceolate; berries ellipsoid when dry ........................................ 13 13. Leaves coriaceous or subcoriaceous .................................................................. T. erubescens Planch. – Leaves papyraceous ........................................................................ T. dubium (M.A.Lawson) Planch. 14. Leaflets broadly ovate or broadly elliptic, apex caudate ................. T. campylocarpum (Kurz) Planch. – Leaflets lanceolate, apex attenuate ..................................................... T. planicaule (Hook.f.) Gagnep. 15. Ovary brownish hirsute; leaves palmately 5-foliolate ................ T. obovatum (M.A.Lawson) Gagnep. – Ovary glabrous; leaves palmately 3-foliolate ................................. T. dubium (M.A.Lawson) Planch. 16. Leaves 5-foliolate, rarely mixed with 7-foliolate ............................................................................. 17 – Leaves 7(–9)-foliolate, rarely mixed with 5-foliolate ...................................................................... 29 17. Branches glabrous; leaflets glabrous on both surfaces ..................................................................... 18 – Branches more or less pubescent; leaflets pubescent at least along the midvein on lower leaf surface ......................................................................................................................................................... 26 18. Secondary branches of peduncle 2 ....................................................................... T. baenzigeri C.L.Li – Secondary branches of peduncle more than 2 .................................................................................. 19 19. Berries pyriform or triangular when dry .......................................................................................... 20 – Berries globose, ovoid or ellipsoid when dry ................................................................................... 21 20. Terminal leaflets ovate–lanceolate, 3–4 × 6–9 cm ; berries pyriform when dry ... T. pyriforme Gagnep. – Terminal leaflets obovate or elliptic, 4–5.5 × 9–12 cm ; berries triangular when dry ............................ .......................................................................................... T. rumicispermum (M.A.Lawson) Planch. 21. Inflorescences compound umbel on pseudo-terminal branch or axile, umbelliform, loose; tendrils bifurcate ............................................................................................... T. serrulatum (Roxb.) Planch. – Inflorescences compound umbel on axile, globose, compact; tendrils unbranched ......................... 22 22. Female flower disc inconspicuous .................................................... T. pachyphyllum (Hemsl.) Chun – Female flower disc conspicuous, thick and adnate to lower part of ovary ........................................ 23 23. Stigma peltate, rounded or slightly 4-lobed ..................................................................................... 24 – Stigma cruciform, 4-lobed, obtuse, acute or pointed apex ............................................................... 25 24. Berries 1.8–3.0 × 1.5–2.5 cm ; seed oblongoid; female flower disc 4-angled ........................................ .................................................................. T. jaichagunii C.L.Li ex Kochaiph. & Trias-Blasi sp. nov. – Berries 0.8–1.2 × 0.8–1.2 cm ; seed ellipsoid; female flower disc rounded ......... T. harmandii Planch. 25. Stigmas 4 acute or pointed lobes, style tubular 0.5–0.8 mm long ... T. dubium (M.A.Lawson) Planch. – Stigmas 4 obtuse lobes, style absent ............................. T. calcicola Kochaiph. & Trias-Blasi sp. nov. 26. Leaflets broadly elliptic or ovate ..................................................................................................... 27 – Leaflets narrowly elliptic or lanceolate ........................................... T. dubium (M.A.Lawson) Planch. 27. Leaflets pubescent along nerve or at least along the midrib on the lower surface ............................ 28 – Leaflets pubescent on both surfaces ........................................ T. macrocorymbum Gagnep. ex J.Wen 28. Berries up to 1.5 cm in diameter .............................................................................. T. pilosum C.L.Li – Berries more than 2 cm in diameter ....................................................... T. siamense Gagnep. & Craib 29. Berries 2–2.5 cm in diameter ................................................................................ T. teaniatum C.L.Li – Berries 0.8–1.5 cm in diameter ........................................................................................................ 30 30. Outer petals densely papillose ..................................... T. leucostaphylum (Dennst.) Alston ex Mabb. – Outer petals glabrous ....................................................................................................................... 31 31. Secondary vein almost 90° with midrib; old branches verrucose, light brown; stigma 4 pointed lobes .............................................................................................................................. T. delavayi Gagnep. – Secondary vein angle nearly 45° with midrib; old branches flaky, grey; stigma 4 rounded lobes or nearly globose, not lobed ............................................................................. T. godefroyanum Planch .