Cyrtopodium, Brown, 1813

Batista, João A. N., González, Andrés & Cruz-Lustre, Gabriela, 2023, A new overlooked species and a new record of Cyrtopodium (Cymbidieae, Orchidaceae) from Uruguay, Phytotaxa 613 (2), pp. 127-139 : 137

Key to the species of Cyrtopodium with pseudobulbs 3–6 cm long, completely buried undergound or partially exposed, sepals and petals with spots and pinkish-purple lip

1. Sepals ≤ 12 mm long; petals ≤ 10 mm long; lip midlobe ≤ 8 mm wide .............................................................................................. 2

- Sepals ≥ 12 mm long; petals ≥ 13 mm long; lip midlobe ≥ 9 mm wide .............................................................................................. 3

2. Sepals 4.5–6 mm wide; petals 6–7 mm wide; lip width between apex of the lateral lobes when spread 10–12 mm wide; lip lateral lobes oblong, 2–2.5 mm wide, parallel to each other .................................................................................................. C. izaguirreae

- Sepals 6–9 mm wide; petals (7–)8–10(–12) mm wide; lip width between apex of the lateral lobes when spread 14–19 mm wide; lip lateral lobes dolabriform, 3–5.5 mm wide, divergent to each other ........................................................................... C. pallidum

3. Lip midlobe flabelliform, widely lunate or reniform, 14–21 mm wide ................................................................ C. brandonianum

- Lip midlobe obtrullate to rhombic, (5–) 7–14 mm wide ................................................................................................................... 4

4. Dorsal sepal 13–16 mm long; petals 13–17 mm long; lateral lobes of lip parallel to each other; lip midlobe (9–) 11–14 mm wide. ........................................................................................................................................................................................ C. lageanum

- Dorsal sepal 8–12 mm long; petals 9–12 mm long; lateral lobes of the lip divergent from each other; lip midlobe (5–) 7–10 mm wide ................................................................................................................................................................................. C. pallidum