Anthurium (Araceae), a distinct neotropical genus with more than 700 species, is a member of the subfamily Pothoideae. The genus ranges from Northern Mexico and the Greater Antilles to Southern Brazil and Northern Argentina and Paraguay. Species diversity is greatest at lower to middle elevations of northern South America, Panama, and Costa Rica, while the upper Amazonian forests and lower Amazonian forests are relatively poor in species. In this paper, 122 species from Mexico and Middle America are revised. The 152 Panamanian species will be treated in a subsequent paper. In Mexico and Middle America, Costa Rica is richest in species, with 65. The remainder of Middle America is relatively poor in species, with Nicaragua having only 25 known species, Honduras having only 13 known species, Guatemala having 25 known species, and Belize fewer than 10 species. Mexico has 41 known taxa with 26 species endemic. In all, six new taxa from Mexico and Middle America were described in this revision: A. armeniense, A. chamulense Matuda ssp. oaxacanum, A. halmoorei, A. lancetillense, A. nelsonii, and A. rzedowskii. In addition, five new combinations have been proposed, including A. chiapasense ssp. tiaxiacense (Matuda) Croat, A. cuneatissimum (Engler) Croat, A. pedatoradiatum ssp. helleborifolium (Schott) Croat, A. schlechtendalii ssp. jimenezii (Matuda) Croat, and A. subcordatum ssp. chlorocardium (Standl. & L. 0. Wins.) Croat. Inglés

Anthurium, a neotropical genus with more than 700 species, is a member of subfamily Pothoideae. Pothoideae contains ten genera, with only Anthurium and Heteropsis occurring in the American tropics. The Pothoideae is tropical, except for the tribe Acoreae*, which contains the widespread genus Acorus and the Australian endemic Gymnostachys. The tribes Culcasieae and Zamioculcaseae with 26 species are strictly African. Four Asian genera, Pothoidium, Anadendrum, Pothos, and Pedicellarum, account for eight percent of the species of the subfamily. Only Pothos, with about 50 species, is very large. Araceae contains 110 genera and more than 2,500 species. It is worldwide in distribution but has most species in tropical areas. Its centers of distribution include both Asia and America (Croat, 1979). There are 14 genera restricted to Africa, and a few genera restricted to temperate regions of the northern hemisphere, including the Mediterranean region. Important local centers of diversity include subtropical and warm temperate South America, with eleven endemic genera, and the Indomalayan region, with thirteen endemic genera. At least 1,350 species, roughly 55 percent of the total, occur in the New World tropics and subtropics. Roughly half of these are Anthurium. Inglés