8. Inflorescence multiflorous, usually with more than 15 flowers each. 
10. Tepals with an abscission line above their base, partially persistent in fruit. 
11. Anthers of whorl III with 2 cells, hypanthium sericeous inside, twigs fistulose .............. C. napoense 
11. Anthers of whorl III with 4 cells, hypanthium glabrous inside, twigs solid 
Ba Mercadene C. hammelianum 
10. Tepals without an abscission line above their base, whole persistent in fruit. 
12. Petioles (23) 30 - 44 (50) mm long; leaf blades (27) 30 - 39 (45) cm long .............. C. chavarrianum 
12. Petioles (0) 1.5 - 4 (6.5) mm long; leaf blades (1) 2.5 - 10 (25) cm long. 
13. Leaf base short attenuate; leaves narrow elliptic 
C. uninervium 
13. Leaf base cordate, amplexicaul or not, or rounded, obtuse or truncate; leaves ovate or 
lanceolate, less often elliptic. 
14. Petioles 2.5-3 mm wide; leaf blades 8-13 cm wide 
C. subsessile 
14. Petioles 0.5-2 mm wide; leaf blades 1.5-4.5 (6) cm wide. 
15. Leaf apex acuminate or acute; plants from Mexico 
C. amplexicaule 
15. Leaf apex obtuse or rounded; plants from Brazil 
C. quadrangulum 
7. Domatia present, at least one or both of lower most pair in some leaves. 
16. Hypanthium sericeo-pubescent inside, at least patches or strips of hairs present 
17. Tepals with an abscission line above their base, partially persistent in fruit 
C. brenesii 
17. Tepals without an abscission line, entirely persistent in fruit. 
18. Domatia leaf surface area flat above and below. 
19. Twigs winged; flower pedicel (10) 12 - 20 (24) mm long C. longipes 
19. Twigs terete or slightly ridged; flower pedicel not over 6 mm long .............008 C. triplinerve 
18. Domatia leaf area usually concave below, flat or more or less ampullose above. 
20. Inflorescences a single 3 - flowered cyme; leaves caudate, thin-herbaceous ..... C. leptophyllum 
20. Inflorescence cymose-paniculate; leaves acute to acuminate, rather chartaceous .. C. areolatum 
16. Hypanthium glabrous inside. 
21. Tepals with an individual abscission line above their base, or a single line below their base, partially or 
not persistent in fruit. 
22. Tepals falling off as a unit, not persistent in fruit; inflorescence pauciflorous, | - 3 dichasia each; 
leaves (1.5) 3 - 4.5 (5.5) cm long 
C. hatschbachii 
be 
