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Article
Published: 2021-04-16

Two new species of Zamia (Zamiaceae, Cycadales) from the Magdalena-Urabá moist forests ecoregion of northern Colombia

Montgomery Botanical Center, Coral Gables, FL, U.S.A. Sociedad Colombiana de Cycadas, Medellín, Colombia
Sociedad Colombiana de Cycadas, Medellín, Colombia Grupo de investigaciones EECO, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Antioquia, Colombia
Herbario Universidad de Caldas (FAUC), Manizales, Caldas, Colombia
Instituto de Investigaciones en Estratigrafía, Universidad de Caldas, Manizales, Caldas, Colombia
Sociedad Colombiana de Cycadas, Medellín, Colombia Universidad CES, Medellín, Antioquia, Colombia
manicata clade Zamia disodon Zamia manicata Zamia melanorrhachis Zamia restrepoi

Abstract

We describe and illustrate Zamia imbricata and Z. sinuensis, two new species (Zamiaceae, Cycadales) from the Magdalena-Urabá moist forests ecoregion of northern Colombia. The new species appear to belong to the manicata clade, an assemblage of species strongly supported by recent molecular phylogenetic analyses and which shares a set of morphological characters such as hypogeous to semi-hypogeous stems, distinctly toothed leaflets, long peduncles, megasporophylls with relatively flat shields, and diminutive pollen cones containing microsporophylls with a much-reduced fertile section of the lamina. Zamia imbricata, a species from the Middle Magdalena Valley Basin of Caldas, is distinguished from other members of the clade by its planar leaves comprised of diminutive, highly imbricate papyraceous leaflets. Zamia sinuensis, a species from the Sinú River Basin of Córdoba is similar to Z. manicata, from which it is distinguished by the absence of the petiolule and gland-like collar that characterize the latter, and by its strongly undulate leaflets. The two new species are discussed within the context of the manicata clade, and a vegetative key to the clade is provided.