Plastid and Seed Morphology Data Support a Revised Infrageneric Classification and an African Origin of the Pantropical Genus Xylopia (Annonaceae), David M. Johnson, Gregory Stull, Nancy Murray, Thomas Couvreur, Jenna Reeger, Caroline Roy
Botany & Microbiology Faculty Work

A New Species in the Tree Genus ​Polyceratocarpus (Annonaceae) from the Udzungwa Mountains of Tanzania, David M. Johnson, Andrew Marshall, Thomas Couvreur, Abigail Summers, Nicolas Deere, W.R. Quentin Luke, Henry Ndangalasi, Sue Sparrow
Botany & Microbiology Faculty Work

Keys to the Genera of Annonaceae, David M. Johnson, Thomas Couvreur, Paul Maas, Svenja Meinke, Paul Kessler
Botany & Microbiology Faculty Work

Molecular and Morphological Characterization of a New Monotypic Genus of Annonaceae, Mwasumbia, from Tanzania, David M. Johnson, Thomas Couvreur, Raymond van der Ham, Youssoufa Mbele, Frank Mbago
Botany & Microbiology Faculty Work