Thismia, Griffith, 1844

Sochor, Michal, Sukri, Rahayu Sukmaria, Metali, Faizah & Dančák, Martin, 2017, Thismia inconspicua (Thismiaceae), a new mycoheterotrophic species from Borneo, Phytotaxa 295 (3), pp. 263-270 : 268

Key of genus Thismia in Borneo (modified after Hroneš et al. 2015)

1. Perianth lobes free; roots creeping, vermiform ................................................................................................................................ 2

- Perianth lobes connate above the mouth of the perianth tube; roots clustered, coralliform ............................................................ 8

2. All perianth lobes simple, of the same length and size .................................................................................................................... 3

- Inner perianth lobes simple, outer perianth lobes consisting of three parts ........................................................... Thismia neptunis

3. Free distal margin of connective with 2 club-shaped and 2 tooth-shaped appendages, stem very short or missing (usually less than 1.5 cm), perianth sepia-brown, appendages of perianth lobes ca. 2 mm, subconical, perianth tube displaced from ovary axis ........ .......................................................................................................................................................................... Thismia inconspicua

- Connective with 2, 3 or 4 finger-shaped or filiform appendages, stem distinct (usually more than 3 cm), perianth white or at least partly yellow, appendages of perianth lobes longer than 7 mm, filiform, perianth tube ± straight .................................................. 4

4. Perianth tube with distinct transverse bars at least at the base; stigmas bifid .................................................................................. 5

- Perianth tube without transverse bars; stigmas not bifid ........................................................................................ Thismia ophiuris

5. Transverse bars found only in the basal part of the perianth tube; anther appendages 3 ........................................... Thismia bifida

- Transverse bars found throughout the perianth tube; anther appendages 2 or 4 .............................................................................. 6

6. Annulus bright yellow, sharply hexagonal; anthers with 4 finger-shaped appendages: 2 upper and 2 lower at the free apical margin of the connective ................................................................................................................................................... Thismia hexagona

- Annulus pale purple, round or weakly hexagonal; anthers with 2 appendages ................................................................................ 7

7. Perianth tube white with brownish-purple streaks; lobes with appendages ca. 17 mm .................................... Thismia mullerensis

- Perianth tube white; perianth lobes with appendages ca. 70 mm ........................................................................... Thismia lauriana

8. Inner perianth lobes form three free, long, almost erect, clavate appendages above the mitre; free apical margin of the connective entire or slightly emarginate ............................................................................................................................................................. 9

- Inner perianth lobes lack any elongated appendages; free apical margin of the connective clearly trilobed ................................ 10

9. Flowers yellow-orange to pink-red; free apical margin of the connective triangular, acute ................................. Thismia clavigera

- Flowers blue-green; free apical margin of the connective rounded to slightly emarginate ................. Thismia betung-kerihunensis

10. Flowers blue; outer perianth lobes distinct; free apical margin of the connective glabrous, without any hairs or ciliae ................... ..................................................................................................................................................................................... Thismia goodii

- Flowers yellow, orange, brown or blackish; outer perianth lobes not distinct; free apical margin of the connective hairy .......... 11

11. Perianth tube yellow-orange; apex of the mitre obtuse without any projections; free apical margin of the connective with lobes of the ± same length and size .................................................................................................................................. Thismia episcopalis

- Perianth tube brown to blackish; apex of the mitre acuminate with three very short projections; free apical margin of the connective with lateral lobes larger, obtusely triangular and the middle lobe narrowly triangular .................................. Thismia brunneomitra