348 



with terminal inflorescences seems to be rather good but is not 

 sharp, since, as we observed before, the difference is only a 

 gradual one. The presence of species with (pseudo-) simple 

 leaves is a secondary feature in those species in which the 

 leaflet is articulated with the petiole. If this is not the case, it 

 may be a primitive one, if it is not so far differentiated, that 

 the articulation too, has disappeared. Clerodendron too, has 

 a subdivision which is not very exact, but we dare not give 

 another. Moreover the fact proves the unity of Clerodendron 

 as a natural group. So is e. g. the section Siphonanthus, distin- 

 guished by its long corolla-tube, probably nearly related (and 

 with transitory forms, e. g. C. mindorense and C. Preslii) to 

 the subsection Densiflora of the section Euclerodendron, the 

 inflorescences being often very dense. In this characteristic, which 

 is very gradual, the Densiflora have transition-forms to the 

 Paniculata (C. Cumingianum and C. macrosfegium), which, in 

 their turn, are allied to the Axilliflora, from which they are 

 separated by the same gradual difference of the longer or 

 shorter intervals between the cymes (C. disparifolia) and to the 

 Penduliflora, the inflorescences of which are more or less 

 pendulous. 



The squamata are more distinctly circumscribed by the inter- 

 petiolar margins, the usually 4-lobed fruit and the scales on 

 the lower side of the leaves, but still have their transitory forms 

 to the Paniculata (C. Blumeanum and C. Horspeldii) which 

 form by far the largest group. 



A curious and aberrant form seems to be C. utakwense which 

 has a 2-lipped calyx. 



Perhaps it would be better that the Racemiflora were given 

 up as a separate subsection since the feature „calyx cup-shaped" 

 is no more valid and C. Friesii (Paniculata) has also narrow, 

 subspicate inflorescences. 



Polymorphous species are C. calamitosum, C. inerme and 

 especially C porphyrocalyx. 



Much differentiated are the SYMPHOREMOiDEiE with their in- 

 volucral bracts and the 5— 18-merous flowers, and the 

 Caryopteridoide^ with their capsules, composed leaves and 

 often enlarged fruiting calyces. 



