28. Leaf area of domatia flat above and below. 
32. Secondary domatia present, at least in some leaves. 
33. Hypanthium glabrous outside and inside C. effusum 
33. Hypanthium mostly pubescent outside, sericeous inside C. triplinerve 
32. Secondary domatia absent. 
34. Tepals without an abscission line, entirely persistent in fruit. 
35. Lower leaf surface with irregular dark spots C. salicifolium 
35. Lower leaf surface without dark spots C. triplinerve 
34. Tepals with an abscission line above or below their bases, partially or not persistent in fruit. 
36. Tepals falling off as a unit soon after anthesis, not persistent in fruit .........0..... C. glaziovii 
36. Tepals with an abscission line above their base, partially persistent in fruit 
C. paratriplinerve 
25. Indument on lower leaf surface made of wavy to curly hairs, appressed to erect, if straight hairs present, these 
mainly spreading or erect. 
37. Domatia absent. 
38. Twigs fistulose 
C. formicarium 
38. Twigs not fistulose. 
39. Leaves pinninerved, if subtriplinerved then secondaries 5-10 pairs C. erythropus 
39. Leaves triplinerved or subtriplinerved, secondaries 3-5 pairs. 
40. Stamens of whorl III with four sporangia; flower pedicel pubescent ...........0....002. C. hirsutum 
40. Stamens of whorl III with two sporangia; flower pedicel glabrous ................... C. haussknechtii 
37. Domatia present; twigs not fistulose. 
41. Secondary domatia absent. 
42. Flower pedicel and outer surface of tepals conspicuously pubescent; fruit pedicel not distinct. 
43. Leaves obovate to oblanceolate; secondary veins 4 - 5 pairs; lower leaf surface hirsute, quite 
visible through hairs C. hirsutum 
43. Leaves lanceolate (rarely ovate or elliptic); secondary veins (6) 7 - 9 (10) pairs; lower leaf 
surface densely tomentose and waxy, hardly visible C. velvetii 
42. Flower pedicel glabrous, tepals glabrous or sparsely pubescent outside. 
37 
