Camaridium carinulatum (Reichenbach, 1877) Blanco, 2008

Rodríguez-Martínez, Lizeth & Blanco, Mario A., 2015, A new species of Camaridium (Orchidaceae: Maxillariinae) from the cloud forests of Colombia, Phytotaxa 222 (1), pp. 61-66 : 65

Key to the species of the Camaridium carinulatum alliance

1. Labellum longer than wide when flattened, with short, rounded lateral lobes that are parallel to the midlobe; sepals and petals recurved; plants from Costa Rica............................................................................................................................ C. campanulatum

- Labellum as wide as long or wider than long when flattened, with triangular or falcate lateral lobes that are oblique or perpendicular to the midlobe; sepals and petals recurved or straight; plants from Costa Rica to Peru...............................................................2

2. Labellum subrhombic, obscurely 3-lobed; plants from Colombia............................................................................... C. perezianum

- Labellum trifurcate or subhastate, clearly 3-lobed; plants from Costa Rica to Peru..........................................................................3

3. Labellum midlobe transversally elliptic, apically rounded; plants from eastern Panama and possibly northwestern Colombia........ ....................................................................................................................................................................................... C. darienense

- Labellum midlobe triangular, apically acute to obtuse; plants from Costa Rica to Peru...................................................................4

4. Labellum midlobe approximately twice as wide and twice as long as the lateral lobes; callus wider than long, widely obtuse (often appearing bifid by splitting in pressed labella), lacking a basal field of papillae; plants from Costa Rica and Panama..................... ................................................................................................................................................................................... C. nutantiflorum

- Labellum midlobe subequal in width and length as (or longer than) the lateral lobes; callus longer than wide, ligulate, minutely trifid, provided with a basal field of papillae; plants from Costa Rica to Peru..................................................................................5

5. Sepals 3.5–5.0 cm long, recurved and overlapping for less than 1 / 3 of their length with the petals during anthesis; plants from Costa Rica and Panama......................................................................................................................................................... C. ampliflorum

- Sepals 2.0– 3.2 cm long, almost straight and overlapping for more than 1 / 3 of their length with the petals during anthesis; plants from Costa Rica to Peru....................................................................................................................................................... C. carinulatum