Thismia sect. Mirabiles, Nuraliev, 2025

Nuraliev, Maxim S. & Sennikov, Alexander N., 2025, A new section in Asian Thismia (Thismiaceae), T. sect. Mirabiles, and its checklist, Phytotaxa 682 (3), pp. 259-266 : 261-262

Key to the species of Thismia sect. Mirabiles

1. Mitre distinctly wider than hypanthium .............................................................................................................................................2

- Mitre narrower than hypanthium to nearly as wide as hypanthium ...................................................................................................5

2. Flower mostly white with orange, lacking any dark/blackish hues; annulus ring-like ........................................ Thismia aurantiaca

- Flower mostly white with bluish/brownish/greenish black; annulus tube-shaped (prominently elongate vertically) .......................3

3. Flower ca. 3 cm long; mitre without foveae at outer surface ................................................................................. Thismia okhaensis

- Flower ca. 2 cm long; mitre with three foveae at outer surface .........................................................................................................4

4. Annulus vertical (erect) with broad aperture; outer surface of annulus glabrous; free parts of inner tepals blue to almost black; mitre top (inside foveae) blue to almost black; inner surface of mitre glabrous .............................................................. Thismia mirabilis

- Annulus dome-shaped with delimited vertical and horizontal parts, with narrow orifice; outer surface of annulus covered with very short hairs; free parts of inner tepals white; mitre top (inside foveae) white except for reddish brown central tip; inner surface of mitre covered with papillate trichomes ................................................................................................................... Thismia puberula

5. Mitre mostly white, with a mucro at top, without foveae or with three foveae placed in the centre of mitre surface.......................6

- Mitre brownish, dark blue or blackish, nearly flat at top, with three foveae occupying almost the entire mitre surface ..................7

6. Mitre without foveae; annulus and abaxial surfaces of stamen filaments very minutely hairy (sometimes apparently glabrous)...... ............................................................................................................................................................................... Thismia mucronata

- Mitre with three foveae placed in the centre of mitre surface; annulus and abaxial surfaces of stamen filaments distinctly hairy .... ......................................................................................................................................................................... Thismia submucronata

7. Flower 1–1.2 cm long; mitre narrower than hypanthium; annulus orifice and abaxial surfaces of stamen filaments at their bases with golden-brown hairs; annulus wider than long ........................................................................................... Thismia angustimitra

- Flower 1.7–2 cm long; mitre approximately as wide as hypanthium; annulus and stamen filaments glabrous; annulus ca. as long as wide ......................................................................................................................................................................... Thismia nigricans