Calea Linnaeus 1763

Key to the species of Calea from the states of Paraná and São Paulo, Brazil 1. Discoid capitulum..............................................................................................................................................................................2. - Radiate capitulum..............................................................................................................................................................................5. 2. Outer phyllaries scarious...................................................................................................................................................................3. - Outer phyllaries foliaceous................................................................................................................................................................4. 3. Capitulescences umbelliform; pappus scales 1.8–4.2 mm long................................................................................... C. lantanoides - Capitulescences cymose; pappus scales 0.2–1.1 mm long.......................................................................................... C. polycephala 4. Venation acrodromous basal; pappus scales 4–5 mm long......................................................................................... C. gentianoides - Venation hyphodromous; pappus scales 0.2–0.3 mm long............................................................................................ C. senecioides 5. Leaf margins thickened and white.....................................................................................................................................................6. - Leaf margins slender and green.........................................................................................................................................................7. 6. Leaves discolorous, abaxial surface glandular-punctate; cypselae 2–2.5 mm....................................................................... C. ilienii - Leaves concolorous, abaxial surface eglandular; cypselae 3.2–3.6 mm................................................................... C. monocephala 7. Capitulescence umbelliform..............................................................................................................................................................8. - Capitulescence cymose dichasial or capitula solitary.....................................................................................................................10. 8. Leaves whorled..................................................................................................................................................................................9. - Leaves decussate.............................................................................................................................................................................11. 9. Leaf limb elliptic; receptacle conic........................................................................................................................... C. mediterranea - Leaf limb obovate or oblanceolate or rhombic; receptacle convex.................................................................................................10. 10. Leaves crowded in a basal rosette; ray floret corolla 9.8–11 mm long............................................................................... C. acaulis - Leaves evenly distributed along the stems; ray floret corolla 11.3–14.7 mm long............................................................. C. cymosa 11. Leaves serrate; capitulescence congest............................................................................................................................... C. serrata - Leaves crenate; capitulescence lax................................................................................................................................ C. pinnatifida 12. Habit herbaceous.............................................................................................................................................................................13. - Habit shrubby..................................................................................................................................................................................18. 13. Leaves 0.04–0.1 cm wide, linear; involucre 8.4–13.4 mm long, receptacle oligopaleaceous.................................... C. graminifolia - Leaves 0.6–4.5 cm wide, ovate to lanceolate or elliptic or obovate to orbiculate; involucre 14.1–25 mm long, receptacle holopaleaceous................................................................................................................................................................................14. 14. Leaf blade ovate; peduncle strigose to scabrous or tomentose........................................................................................................15. - Leaf blade elliptic or obovate to orbiculate; peduncle velutinous or hirsute..................................................................................16. 15. Receptacle convex, paleae 9–13 mm long; tube of ray florets 3–5 mm long.................................................................... C. uniflora - Receptacle conic, paleae 14–20 mm long; tube of ray florets 6–7.5 mm long............................................................. C. verticillata 16. Leaf limb elliptic, apex acute; peduncle hirsute; receptacle convex.......................................................................... C. clausseniana - Leaf limb obovate to orbiculate, apex rounded; peduncle velutinous; receptacle conic.................................................................17. 17. Outermost series of phyllaries longer than the second and third series............................................................................ C. pohliana - Outermost series of phyllaries shorter than the second and third series.......................................................................... C. cuneifolia 18. Leaves sessile, limb linear, venation hyphodromous; disc florets 5–10; pappus scales 0.2–0.5 mm long................. C. hymenolepis - Leaves petiolate, limb ovate or lanceolate or elliptic or deltate, venation acrodromous basal or reticulate or eucamptodromous; disc florets 15–75; pappus scales 0.7–3.0 mm long................................................................................................................................19. 19. Leaf base attenuate; two outermost series of phyllaries 12.2–20 mm long; corolla of ray florets 16.9–31 mm long................................................................................................................................................................................................................ C. grandiflora - Leaf base rounded or cordate or truncate; two outermost series of phyllaries 3.3–11.2 mm long; corolla of ray florets 7.4–16.5 mm long................................................................................................................................................................................. C. marginata 20. Stems corrugated, puberulous or puberulent; leaves chartaceous, margins flat.............................................................. C. parvifolia - Stems striated, hispid to hispidulous, strigose, rarely glabrous; leaves coriaceous, margins revolute............................................21. 21. Second series of phyllaries pubescent to puberulous; ray floret corolla 15.3–17 mm long, limb 12.5–13.5 mm long................................................................................................................................................................................................................ C. pruskiana - Second series of phyllaries strigose or glabrous or hispid; ray floret corolla 7.4–14.2 mm long, limb 5.9–10.5 mm long...........22. 22. Leaf abaxial surface glabrous; cypsela angles hirsute............................................................................................. C. subintegerrima - Leaf abaxial surface sparsely scabridous or scabridulous; cypsela angles pilose...........................................................................23. 23. Leaf base cordate; third series of phyllaries eglandular; receptacle paleae conduplicate.................................................. C. triantha - Leaf base rounded or subcordate; third series of phyllaries glandular-punctate; receptacle paleae concave............ C. × parvianthaPublished as part of Bueno, Vinicius R., Cassol, A. P. V., Leroy, C. J., Bueno, M. L. & Heiden, Gustavo, 2023, Two noteworthy Calea (Asteraceae: Neurolaeneae) from contact areas of the Atlantic Forest and Cerrado of Brazil, pp. 143-161 in Phytotaxa 579 (3) on pages 155-156, DOI: 10.11646/phytotaxa.579.3.1, http://zenodo.org/record/755033