Key to the species of Calea sect. Calea from Brasil 1. Capitula radiate..................................................................................................................................................................................2. - Capitula discoid .................................................................................................................................................................................6. 2. Capitulum solitary or capitula arranged in pairs ...............................................................................................................................3. - Capitula arranged in capitulescences with three or more capitula ....................................................................................................4. 3. Involucre 3-seriate, 7.5–10 mm long, receptacle epaleaceous; ray florets 5–7, disc florets ca. 15; pappus scales 0.8 mm long ........ .......................................................................................................................................................................................... C. caleoides - Involucre 6-seriate, 12.2–12.7 mm long, receptacle holopaleaceous; ray florets 8–10, disc florets 30–40; pappus scales 1.1–4.3 mm long..................................................................................................................................................................................... C. repanda 4. Ray florets 11–12; pappus scales ca. 15 ........................................................................................................................ C. lucidivenia - Ray florets 2–10; pappus scales 25–43 .............................................................................................................................................5. 5. Leaf margins pinnatifid; capitula sparsely arranged...................................................................................................... C. pinnatifida - Leaf margins serrate; capitula densely arranged ................................................................................................................. C. serrata 6. Phyllaries foliaceous, longer than the involucre................................................................................................................................7. - Phyllaries foliaceous, of the same length or shorter than the involucre............................................................................................8. 7. Ray florets 12–25 .................................................................................................................................................................... C. lutea - Ray florets 4–5 .................................................................................................................................................................. C. papposa 8. Receptacle epaleaceous ............................................................................................................................................... C. gentianoides - Receptacle oligopaleaceous or holopaleaceous.................................................................................................................................9. 9. Involucre 4-seriate; pappus scales 1.9–2.3 mm long........................................................................................................ C. divergens - Involucre 5–8-seriate; pappus scales 2.7–5.5 mm long...................................................................................................................10. 10. Involucre 5-seriate...........................................................................................................................................................................11. - Involucre 7–8-seriate .......................................................................................................................................................................12. 11. Involucre 3.5–5.2 mm long; receptacle oligopaleaceous, paleae 2–4; disc florets 7–9; cypselae 2.7–3 mm long .............................. ................................................................................................................................................................................. C. diamantinensis - Involucre 6.7–8.4 mm long; receptacle holopaleaceous, paleae 20–30; disc florets 20–30; cypselae 2–2.5 mm long ....................... ............................................................................................................................................................................................... C. oliveri 12. Leaf blade glabrous; pappus scales 15 ............................................................................................................................ C. abelioides - Leaf blade pilose; pappus scales 16–25...........................................................................................................................................13. 13. Petiole 0.5–1.5 mm long, leaf surface abaxially pubescent ......................................................................................... C. solidaginea - Petiole 3–7 mm long, leaf surface abaxially tomentose............................................................................................... C. lantanoides

Published as part of Bueno, Vinicius R., Gostel, Morgan R. & Heiden, Gustavo, 2022, Calea repanda (Asteraceae: Neurolaeneae), a new species and novel characters for the taxonomy of the genus, pp. 280-288 in Phytotaxa 544 (3) on pages 285-286, DOI: 10.11646/phytotaxa.544.3.2, http://zenodo.org/record/6520258