Thismia

Nuraliev, Maxim S., Beer, Anton S., Kuznetsov, Andrey N. & Kuznetsova, Svetlana P., 2014, Thismia mucronata (Thismiaceae), a new species from Southern Vietnam, Phytotaxa 167 (3), pp. 245-255 : 253

Key to the species of Thismia in Vietnam

1. Inner tepals free, with spreading filiform appendages longer than 6 mm .........................................................................................2.

- Inner tepals fused apically into mitre, appendages absent or very short (less than 2 mm) ...............................................................4.

2. Inner and outer tepals subequal, both terminated by spreading filiform appendages 6.5–9 mm long; whole flower brownish.......... ............................................................................................................................................................................. Thismia annamensis

- Inner and outer tepals unequal, outer tepals without appendages; flower white-, yellow- and red-colored ....................................3.

3. Anthers tridentate apically, each tooth terminated by a hair; hypanthium inside with longitudinal bars connected by several transversal bars; hypanthium pale orange outside at least at the upper part ............................................................ Thismia javanica

- Anthers bidentate apically without hairs at apex, hypanthium inside finely irregularly manicate-rugulose without transverse bars; hypanthium uniformly white outside.................................................................................................................... Thismia tentaculata

4. Flowers large (ca. 3 cm); mitre broader than hypanthium, with digitally furrowed top, appendages absent ........ Thismia okhaensis

- Flowers small (less than 2 cm); mitre narrower than hypanthium, bearing three short apical appendages initially appressed and resembling a mucro ............................................................................................................................................. Thismia mucronata