Porphyrochitonium described by Engler were included in his section Urospadix , a few were included in other sections, including Tetraspermium (A. margaricarpum Sodiro) and in Xialophyllium (A. angosturense Engl., A. filiforme Engl., and A. tenuinerve Sodiro).

Section Digitinervium is a small group with leathery, pli-veined, glandular-punctate leaf blades and scalariform venation. It ranges from Costa Rica to Venezuela and Peru, particularly at middle to high elevations. The section is centered in the mountains of Ecuador, and most species were described by Sodiro (loc. cit.). Only a few species exist in this section and relatively few of them are believed to be new to science.

Section Cardiolonchium is also heavily concentrated in the Andean region at low to middle elevations, especially on the western slopes of the Andes. A few species occur in the lower part of Central America and one species, A. costatum K. Koch & Bouché occurs in the coastal range of northern Venezuela. One species, A. rubrinervium (Link) Don (probably to include both A. polyrrhizum K. Koch & Augustin and A. alienatum Schott) is widespread in the Amazon basin, ranging from lowland Ecuador and Peru to the Guianas. Section Cardiolonchium , with frequently velvety, often discolored leaf blades, was represented among the earliest introductions into European glasshouses. Many species are narrowly restricted and now rare. Most have probably already been described but a few new species remain.

Despite having velvety leaves, a few Mexican species appear to be unrelated to Section Cardiolonchium . They include A. clarinervium Matuda, A. lezamae Matuda and A. leuconeurum  Lem. These species will hybridize with other Mexican species including species in unrelated groups such as A. pedatoradiatum Schott but not with Cardiolonchium species in other areas. This again points out the isolated nature of the Mexican species of Anthurium . Indeed, Central American species of Anthurium in general are not closely related to those of South America. For example, of the 221 Central American species, only two, A. scandens (Aublet) Engl. and A. gracile (Rudge) Schott, are truly wide-ranging, i. e. from Mexico to Brazil. While quite a large number enter northern Colombia, or barely enter Panama from South America, only ten additional species from Middle America enter into non-Colombian portions of South America (Croat, 1986a).

Another example pointing out the isolated nature of Central America is the breeding behavior of Anthurium sect. Pachyneurium . While Central and South American species respectively will readily interbreed within their own group, few Central American species will cross with South American species (Croat, 1991).

In contrast to those groups mentioned above, which have the majority of their species in the Andean regions, section Urospadix is almost exclusively known from eastern South America and is most heavily concentrated on slopes of the eroded plateau of central and southern Brazil. Here it clearly represents the most dominant group of Araceae . Mayo reports approximately 60 species of sect. Urospadix , and there are numerous new species in the region. Some members of the section range as far north as the Guiana Highlands, and at least one member believed to be in the group, A. lilacinum Bunting, even occurs in the Cordillera de la Costa in northern Venezuela.

Another unique section, Chamaerepium , represented only by A. radicans K. Koch & Haage, is restricted to eastern Brazil. Though now represented in cultivated collections in many places, it is apparently rare in the wild.