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| Amorphophallus sakonnakhonensis Chatan & Promprom, in Promprom, Chatan, Pasorn, Prasertsri et Angkahad, 2023. |
Abstract
Amorphophallus sakonnakhonensis Chatan & Promprom, a new species from northeastern Thailand, is described and illustrated. The new species is most similar to A. harmandii Engl. & Gehrm. and A. linearis Gagnep., but it is distinguished by the combination of characters as follows: clear differences with A. harmandii are shorter style; disc-like, slightly smooth surface, concave centre, ca. 0.2 × 0.1 mm stigma; slightly cylindrical, slightly narrower upper part of staminate flower zone; slightly cylindrical to elongate-fusiform, erect or slightly erect, creamy white appendix. The clearly distinct morphology with A. linearis are disc-like, slightly smooth surface, concave centre, ca. 0.2 × 0.1 mm stigma; elliptic or obovate leaflet; 1–3 cm long, creamy white appendix. The preliminary conservation status was assessed, and the distinct characteristics of similar species were discussed.
Key words: Amorphophallus sakonnakhonensis, Araceae, aroid, plant diversity, plant taxonomy
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| Amorphophallus sakonnakhonensis Chatan & Promprom. A whole plant B, C tuber and inflorescence from the same plant D seeds E spadix F staminate flowers G pistillate flowers H infructescence and fruits I fruit. |
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| Amorphophallus sakonnakhonensis Chatan & Promprom. A habitat and habit B habit. |
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| Amorphophallus sakonnakhonensis Chatan & Promprom. A whole plant B, C tuber and inflorescence from the same plant D spadix E infructescence and fruits F seeds. |
Amorphophallus sakonnakhonensis Chatan & Promprom, sp. nov.
Diagnosis: Amorphophallus sakonnakhonensis is most similar to A. harmandii Engl. & Gehrm. and A. linearis Gagnep. The essential differences with A. harmandii are shorter style (ca. 1 mm vs. 2–3 mm long); disc-like, slightly smooth surface, concave centre, ca. 0.2 × 0.1 mm stigma vs. depressed, shallowly bilobed, ca 0.6 × 1.5 mm; slightly cylindrical, narrower upper part staminate flower zone vs. fusiform-conical or lageniform with distinctly dilated basal haft; slightly cylindrical to elongate-fusiform, erect or slightly erect, creamy white appendix vs. very narrowly conical, near myosuroid or fusiform conical or slightly sigmoidally curved forward in the lower half, white or greenish yellow.
Etymology: Specific epithet of A. sakonnakhonensis refers to the type locality, Sakon Nakhon Province, northeastern Thailand.
Vernacular name: The Vernacular name of the new species is Buk Noi (บุกน้อย).
Wilawan Promprom, Wannachai Chatan, Pattana Pasorn, Narueset Prasertsri and Thinnakon Angkahad. 2023. A New Species of Amorphophallus (Araceae) from northeastern Thailand. PhytoKeys. 229: 131-138. DOI: 10.3897/phytokeys.229.106466
