Cyrtopodium, Brown, 1813

Batista, João A. N., Valebella, Miriam & Cruz-Lustre, Gabriela, 2023, A New Overlooked Species of Cyrtopodium (Cymbidieae, Orchidaceae) from the Southern Andean Yungas and Chaco Serrano Ecoregions of Northern Argentina and Southwestern Bolivia, Phytotaxa 587 (3), pp. 283-293 : 291

Key to terrestrial or occasionally rupicolous species of Cyrtopodium with medium-sized, aerial pseudobulbs (10–25 cm long)

1. Plants from poorly drained, water-saturated soils ..............................................................................................................................2

- Plants from dry, well-drained soils.....................................................................................................................................................4

2. Flowers pinkish-violet; callus bilamellate................................................................................................................... C. hatschbachii

- Flowers yellow, brownish or vinaceous; callus warty........................................................................................................................3

3. Lip lateral lobes falcate, apex acute ............................................................................................................................. C. parviflorum

- Lip lateral lobes spatulate, apices rounded.................................................................................................................. C. paludicolum

4. Lip lateral lobes falcate or oblong, base not constricted ....................................................................................................................5

- Lip lateral lobes dolabriform, obovoid, spatulate or transversely broadly ovate, base constricted ...................................................6

5. Lip lateral lobes falcate, apex acute ............................................................................................................................. C. parviflorum

- Lip lateral lobes oblong to obovoid, apex rounded ............................................................................................................. C. vernum

6. Lateral lobes of the lip smaller than the mid lobe (smaller in both width and length); isthmus separating the mid lobe from lateral lobes usually conspicuous, 1–4 mm long...........................................................................................................................................7

- Lateral lobes of the lip approximately the same size as the mid lobe (about the same width and length); isthmus separating the mid lobe from lateral lobes absent or inconspicuous, 0–1(–2) mm long...................................................................................................8

7. Inflorescence usually profusely branched, occasionally racemose; sepals, petals and lip yellow with red to reddish brown spots; lip lateral lobes upper margin wavy; mid lobe 6–10 mm wide ............................................................................................. C. virescens

- Inflorescence usually racemose, occasionally with 1–2 secondary axis; sepals and petals brownish or greenish, base and apex speckled or filled with red, lip yellow with red lateral lobes; lip lateral lobes upper margin entire; mid lobe 10–14 mm wide......... ............................................................................................................................................................................................. C. eugenii

8. Inflorescence always racemose; flowers yellow with few or no spots, when present, reddish or brown; mid lobe margin entire...... .......................................................................................................................................................................................... C. cristatum

- Inflorescence paniculate, rarely racemose; flowers yellow with red or reddish brown spots; mid lobe margin strongly warty lamellar ............................................................................................................................................................................ C. valebellae