- 75 - 



b. Calyx infundibuliform, densely puberulous outside; margin of leaf entire, 



rarely dentate 21 



20.a. Panicles terminal, leafed below; calyx glabrous outside, five-cleft for the half ; 

 corolla-tube 2—3 times as long as the calyx.— Leaves ovate or ovate-rhomboid, 

 irregularly and bluntly serrate, except at the base and at the top . 



17. C. multiflorum. 



b. Panicles leafed, composed of axillary cymes; calyx sparsely hairy outside, 

 cleft almost down to the base; corolla-tube about as long as the calyx ; leaves 

 oblong-lanceolate, elliptic or subobovate, irregularly toothed or subentire. 



18. C. fortunatum. 



21a. Inflorescences terminal, sometimes leafless, except at the base; corolla-tube 

 1.5—2.5 c.M. long; leaves with obtuse or rounded, sometimes subcordate 

 base . . , . . . . , 19. C. porphyrocalyx. 



b. Inflorescences composed of cymes in the axils of normal leaves ; corolla-tube 

 4-5 c.M, long; leaves with acute-attenuate base , . 20. C. ingratum. 

 22 a. Cymes in the axils of normal leaves, 1-5-flowered ; leaves in whorles of 3-5, 

 rarely opposite, 10-more times as long as broad. . . 21. C. indicum. 

 b. Inflorescences terminal, leafless; leaves always opposite, less than 7 times 



as long as broad 23 



23a. Calyx cleft down to the base, lobes narrowly lanceolate . . . . .24 

 b. Calyx löbed not more than for 2 / 3 down; segments ovate or deltoid . . 25 



24. a. Calyx and corolla glabrous outside; leaves densely glandular-punctulate 



below; undershrubs of + 1 M, high, with hollow club-shaped internodes, 

 which are provided with two opposite round holes at the top 22. C. fistulosum 

 b. Calyx and corolla pubescent outside; leaves not or scarcely glandular- 

 punctulate below; shrubs or small trees, + 5 M. high, also often with inflated 

 internodes, but without holes 23. C. Ridleyi 



25. a. Corolla glabrous outside; branchlets without distinct lenticels 



■ . • 24. C. longiflorum 



b. Corolla puberulous outside; branchlets with distinct light-coloured lenticels 26 



26. a. Calyx densely puberulous outside. .... 25. C. quadriloculare 



b. Calyx glabrous outside 27 



27. a. Calyx tubular, inflated, 2-3.5 c.M. long; leaves glabrous on both sides 



26. C. minahassae 



b. Calyx campanulate, 1-1.5 c.M. long; leaves puberulous on both sides 

 . ■'. , 27. C. capitatum 



28. a. CoroUa-tube 10-12 c.M. long; calyx glabrous outside 28. C. hastatum 



b. Corolla-tube less than 10 c.M. long; calyx hairy outside. ... .29 



29. a. Inflorescences leafed, composed of cymes in the axils of normal leaves 30 

 b. Inflorescences terminal; cymes, often the lower ones excepted, in the axils 



of less develloped or bracteal leaves 32 



30. a. Corolla globrous outside; calyx very small, smaller than the fruit, when 



fruiting . . 29, C. Colebrokianum 



b. Corolla hairy outside; calyx rather large, as large as, or larger than the fruit, 

 when fruiting .31 



31. a. Cymes capitate, dense, many-flowered, with large, foliaceous and persistent 



bracts; leaves densely villous on both sides, margins entire 30. C. bracteatum 

 b. Cymes lax, ràther few-flowered, with small, deciduous bracts. Leaves very 

 sparsely hairy on both sides, or glabrous except the nerves, margins distantly 

 serrate-dentate, or (in the leaves below) 3-lobed . 31. C. trichotomum 



32. a. Inflorescences dense, globose, or composed of capitate cymes; bracts usually 



large or foliaceous, subpersistent; corolla-lobes regularly spreading , . 33 

 b. Inflorescences elongated, paniculaeform ; bracts small and caducous; corolla 

 more or less oblique . , . .■*,'. '. . ,35 



