Table 1. Morphological comparison between Thismia sumatrana and the plants reported as Thismia clavigera. CharactersT. sumatranaT. clavigera (type locality) 1T. clavigera (Langkawi) 2T. clavigera (Aceh) 2T. clavigera (Tarutao) 3Stem height5-7.5 cm6-9 cmup to 12 cmsimilar to Langkawiup to 9 cmFloral bract10-13 mm long6-7 mm longup to 12 mm longsimilar to Langkawica. 12 mm longNumber of flowers131-6similar to Langkawi1-2(-3)Appendices on the tip of mitreeaves-like to hood-shapedeaves-likepoorly developedsimilar to Langkawipoorly developedLength of perianth tubeca. 27 mmca. 9 mmca. 13 mmsimilar to Langkawi15-19 mmLength of claviform appendagesca. 38 mm8-12 mm12-14 mmca. 5 mm long19-32 mmSize of outer perianth lobeca. 2.5 mmca. 1 mm0.3-0.4 mmsimilar to Langkawica. 1 mmStatus of nectariferous gland on the top of mitrerectangular, 1.2-1.4 mm longunknownrectangular, ca. 0.9 mm longsimilar to Langkawiorbicular, ca. 0.8 mm diameterStatus of thecaeoblong, 1.2-1.4 mm long, located in the uppermost part of connectiveunknownoblong, ca. 1 mm long, located in the uppermost part connectivesimilar to Langkawioblong, ca. 2 mm long, located little above the middle of connective 1from Beccari (1878), Jonker (1938) and our own examination of holotype image. 2from Stone (1980). 3from Chantanaorrapint and Chantanaorrapint (2009).

Published as part of Suetsugu, Kenji, Tsukaya, Hirokazu, Nurainas, Nurainas & Okada, Hiroshi, 2018, Thismia sumatrana (Thismiaceae), a new species from West Sumatra, Indonesia, with discussions on the taxonomic identity of Thismia clavigera, pp. 59 in PhytoKeys 113 on page 59, DOI: 10.3897/phytokeys.113.29103, http://zenodo.org/record/2264770