Key to the species of Orchidaceae in PE Chacrinha 1. Epiphytic herbs. 2. One apical leaf; inflorescence lateral, in panicle; sepals and petals maculate ........................................................ ................................................ Trichocentrum pumilum 2. Two apical leaves; inflorescence terminal, in raceme; sepals and petals immaculate............ Cattleya forbesii 1’. Terricolous or rupicolous herbs. 3. Leaves apical. 4. Two leaves ...................................... Maxillaria subulata 4’. One leaf. 5. Leaves maculate; inflorescence lateral; flowers calcarate .................................................... Oeceoclades maculata 5’. Leaves immaculate; inflorescence terminal; flowers ecalcarate. 6. Leaves cylindrical; sepals and petals white-yellowish to yellowish .................................. Brassavola tuberculata 6’. Leaves flat to concave; sepals and petals purple ............. ............................................................ Acianthera limae 3’. Leaves basal in rosette or distributed along the caulome. 7. Leaves reticulate-veined.............. Aspidogyne argentea 7’. Leaves obscurely or distinctly parallel-veined. 8. Leaves membranaceous or chartaceous, convolute (rolled like an umbrella) or plicate (folded like a fan). 9. Leaves plicate, sepals and petals yellow to greenish-yell ow...................................... .......... Cyrtopodium flavum 9’. Leaves convolute, sepals and petals pale green to green. 10. Flowers resupinate; lip trilobed. 11. Leaves sessile; inflorescence glabrous; petals bifid ....... ..................................................... Habenaria leptoceras 11’. Leaves petiolate; inflorescence pilose; petals entire. 12. One to three leaves; flowers calcarate; lip green ............ ........................................................ Eltroplectris triloba 12’. Five leaves; flowers ecalcarate; lip white .................. ...... ................................................. Cyclopogon argyrifolius 10’. Flowers non-resupinate; lip entire. 13. Leaves petiolate, rarely sessile; leaf blade lanceolate or elliptic; inflorescence lax; flowers not overlapping ........ .............................................. Prescottia plantaginifolia 13’. Leaves sessile; leaf blade linear; inflorescence congested; flowers overlapping .............. Prescottia spiranthophylla 8’. Leaves coriaceous, conduplicate (folded along the midrib). 14. Flowers resupinate; sepals and petals green to brownish ............................ Epidendrum ammophilum 14’. Flowers non-resupinate; sepals and petals pink to lilac. 15. Lip with cut-out and multifaceted callus and limited to the center of the disc........................................................ ................................................. Epidendrum secundum 15’. Lip with two basal oval calli and keel-like central callus projected longitudinally over the central lobe ............................................ Epidendrum denticulatum

Published as part of Barberena, Felipe Fajardo Villela Antolin, Silva, Roberto da & Lopes, Rosana Conrado, 2022, Copacabana is more than a beach in Rio de Janeiro, Brazil: the orchid flora of Parque Estadual da Chacrinha, pp. 30-40 in Caldasia 44 (1) on page 35, DOI: 10.15446/caldasia.v44n1.88156, http://zenodo.org/record/15265162