Anoectochilus (Gastony & Yatskievych, 1992)

Jin, Yue, Sun, Mei, Jiang, Hong, Kumar, Pankaj, Liu, Zhen, Schuiteman, Andre, Wu, Jianyong & Tian, Huaizhen, 2021, Anoectochilus medogensis (Goodyerinae, Cranichideae, Orchidaceae), a new species from Tibet, China, Phytotaxa 510 (3), pp. 213-227 : 219-220

Key for identifications of members of genus Anoectochilus in China

Based on a series of new species (Tian et al. 2008, Chen & Shui 2010, Tian et al. 2014, Qu et al. 2015), new records for China ( Hu et al. 2012, Wu et al. 2017, Zheng et al. 2018, 2019, Jin et al. 2019) and the latest generic revision ( Han 2019), there are currently 20 species of Anoectochilus known from China. The following is a tentative key for the identification of these species.

1. Non-resupinate flowers with 0° or 360° torsion; labellum held uppermost ......................................................................................2

- Resupinate flowers with 180° torsion; labellum held lowermost.....................................................................................................12

2. Mesochile flange absent or highly reduced ........................................................................................................................................3

- Mesochile flange distinct, filamentous or subrectangular..................................................................................................................4

3. Lip white; mesochile 3–5 mm; spur 6.5–7 mm ....................................................................................... A. koshunensis 恒春ffiȗ兰

- Lip yellow; mesochile 5–9 mm; spur 3.5–4.5 mm ................................................................................ A. burmannicus 滇南żȗ兰

4. Mesochile flange filamentous.............................................................................................................................................................5

- Mesochile flange subrectangular........................................................................................................................................................9

5. Spur U-shaped ....................................................................................................................................... A. zhejiangensis ṁữżȗ兰

- Spur straight........................................................................................................................................................................................6

6. Lip T-shaped ......................................................................................................................................... A. pingbianensis DZ 边żȗ兰

- Lip Y-shaped.......................................................................................................................................................................................7

7. Filaments of mesochile 4–6 mm long ............................................................................................................... A. roxburghii żȗ兰

- Filaments of mesochile less than 4 mm long......................................................................................................................................8

8. Epichile lobes obliquely ligulate obcuneate, truncate, ca. 12 mm long .................................................... A. longilobus 长片żȗ兰

- Epichile lobes obovate to triangular, 8–9 mm long.................................................................................. A. chapaensis 滇ŭżȗ兰

9. Petals with appendage, consisting of 2–5 papillae ..................................................................................... A. papillosus ĒẊffiȗ 兰

- Petals without appendages, entire.....................................................................................................................................................10

10. Epichile lobes obovate to cuneate; lobes at spur apex, 1–1.2 mm long ............................................... A. malipoensis 麻栗Dzżȗ兰

- Epichile lobes oblong or oblanceolate; lobes at spur apex, 0.6–0.8 mm long .................................................................................11

11. Leaf 1.5–2.0 × 1.5–2.5; petals white, with greenish margin; margin of flanges irregularly laciniate, pointing backward, forming an obtuse angle with epichile lobes............................................................................................................. A. nandanensis 南丹żȗ兰

- Leaf 3.5–4.0 × 3.0–3.2; petals pinkish white; margin of flanges fimbriate, teeth ca. 1.5 mm, pointing forward, forming an acute angle with epichile lobes ............................................................................................................................. A. emeiensis 峨眉żȗ兰

12. Filaments of mesochile short or not obvious, less than 3 mm long .................................................................................................13

- Filaments of mesochile long, over 5 mm long .................................................................................................................................16

13. Teeth of mesochile 8–15.............................................................................................................................. A. calcareus Ṉẩżȗ 兰

- Teeth of mesochile less than 5 or not obvious..................................................................................................................................14

14. Epichile lobes obovate-triangular.............................................................................................................. A. brevilabris 短唇żȗ兰

- Epichile lobes oblong or oblanceolate..............................................................................................................................................15

15. Mesochile flange with 3 filaments, each 2–3.5 mm long; column wings oblong-elliptic...................... A. baotingensis 保亭żȗ兰

- Mesochile flange slightly erose or with 1–3 short irregular projections; column wings flabellate .................... A. lylei 丽蕾żȗ兰

16. Epichile lobes white, filaments of mesochile pale yellowish; mesochile flange with 5 filaments .......... A. formosanus ûñffiȗ兰

- Epichile lobes and mesochile uniformly white; mesochile flange with more than 6 filaments .......................................................17

17. Spur over 8 mm long ........................................................................................................................................................................18

- Spur ca. 4.5 mm long........................................................................................................................................................................19

18. Column wings with a broadly ligulate anterior part; veins on leaf dense .............................................. A. hainanensis 海南żȗ兰

- Column wings oblong with truncate apex; veins on leaf relatively sparse ........................................................... A. elatus 高żȗ兰

19. Filaments of mesochile flange longer, each 8–12 mm long; lip 15 mm long; column lamellae broad, semi-circular......................... .................................................................................................................................................................. A. medogensis Ḇüżȗ 兰

- Filaments of mesochile flange shorter, each 5–8 mm long; lip longer, 18–22 mm; column lamellae narrow, straight....................... ................................................................................................................................................................ A. albolineatus ±国żȗ兰