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A MONOGRAPHIC REVISION OF THE GENUS PODOCARPUS (PODOCARPACEAE): III. THE SPECIES OF THE CENTRAL AMERICA AND NORTHERN MEXICO BIOREGIONS

  • R. R. Mill (a1)

Abstract

The species of Podocarpus L’Hér. ex Pers. (Podocarpaceae) occurring in the Central America and Northern Mexico Bioregions are revised. Four species (Podocarpus costaricensis de Laub., P. guatemalensis Standl., P. matudae Lundell, P. oleifolius D.Don) occur in these bioregions as well as three infraspecific taxa, that are here all treated as subspecies [Podocarpus matudae subsp. matudae, P. matudae subsp. jaliscanus (de Laub. & Silba) Silba, P. oleifolius subsp. costaricensis (J.Buchholz & N.E.Gray) Silba]. A fifth species, Podocarpus magnifolius J.Buchholz & N.E.Gray, may also be present in Panama but this requires verification; a brief account is provided. Podocarpus monteverdeensis de Laub. is considered a synonym of P. oleifolius subsp. costaricensis, the concept of which is amplified to include all Central American material of P. oleifolius. Several previously recognised infraspecific taxa within both Podocarpus guatemalensis and P. matudae are reduced to synonymy. Within Podocarpus matudae, P. matudae subsp. matudae is regarded as including subsp. macrocarpus and subsp. reichei but P. matudae subsp. jaliscanus is regarded as a distinct, second subspecies disjunct in westernmost Mexico. Podocarpus costaricensis, P. matudae (both subspecies) and P. oleifolius subsp. costaricensis are endemic to these bioregions. A key is provided, all definitely recorded species are illustrated and the distributions of all definitely recorded taxa are mapped. The distributions are discussed in relation to the geology and geological history of the region as well as altitude and climate. New IUCN conservation assessments are proposed for Podocarpus matudae subsp. jaliscanus, P. matudae subsp. matudae and P. oleifolius subsp. costaricensis while details of the current assessments for the remaining taxa (including Podocarpus matudae as a whole) are given. Two appendices list all accepted names and synonyms, and give a list of exsiccatae.

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This and the previous paper (Mill, 2015) are dedicated to the late Darian Stark Schilling (1980–2011).

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