, University of Michigan Herbarium and Department of Ecology and Evolutionary Biology, United States

• Anales del Jardín Botánico de Madrid Vol. 67 No. 1 (2010) - Articles
  Two new South American species of Croton (Euphorbiaceae) and their phylogenetic affinities
  Abstract  PDF
• Anales del Jardín Botánico de Madrid Vol. 69 No. 1 (2012) - Articles
  Botanical novelties from Sierra de Maigualida, southern Venezuela. II
  Abstract  PDF