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

We describe and illustrate Zamia imbricata and Z. sinuensis, two new species (Zamiaceae, Cycadales) from the Magdalena-Urab? 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 Sin? River Basin of C?rdoba 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.