My research focuses on the taxonomy, systematics, speciation, biogeography and natural history of North and South American plants using macro and micro-morphology, and molecular systematics. Currently researched groups include the flowering plant families Gentianaceae (gentians; Macrocarpaea, Symbolanthus), Brassicaceae (Parrya), Bromeliaceae (Alcantarea, Vriesea, and Werauhia), Loganiaceae (Bonyunia), and the fern family Ophioglossaceae (Botrychium). Geographical regions where I largely conduct my research include the Andes in South America (Venezuela, Colombia, Ecuador, Peru, and Bolivia), and Arctic and mountainous regions of North America, Europe and Asia.

• Rapid allopolyploid radiation of moonwort ferns (Botrychium; Ophioglossaceae) revealed by PacBio sequencing of homologous and homeologous nuclear regions
  Dauphin, Benjamin; Grant, Jason R.; Farrar, Donald R.; Rothfels, Carl J.
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 120 342-353; https://doi.org/10.1016/j.ympev.2017.11.025 MAR 2018
• Title: A Worldwide Molecular Phylogeny Provides New Insight on Cryptic Diversity Within the Moonworts (Botrychium s. s., Ophioglossaceae) 
  Author(s): Dauphin, Benjamin; Farrar, Donald R.; Maccagni, Alessio; et al. 
  Source: SYSTEMATIC BOTANY, 42 (4): DEC 2017 
  Document Type: Article (Details)
• Title: Phylogeography of the moonwort fern Botrychium lunaria (Ophioglossaceae) based on chloroplast DNA in the Central-European Mountain System 
  Author(s): Maccagni, Alessio; Parisod, Christian; Grant, Jason R. 
  Source: ALPINE BOTANY, 127 (2): 185-196 OCT 2017 
  Document Type: Article (Details)
• Title: A community-derived classification for extant lycophytes and ferns 
  Author(s): Schuettpelz, Eric; Schneider, Harald; Smith, Alan R.; et al. 
  Source: JOURNAL OF SYSTEMATICS AND EVOLUTION, 54 (6): 563-603 NOV 2016 
  Document Type: Article (Details)
• Title: MOLECULAR PHYLOGENETICS SUPPORTS WIDESPREAD CRYPTIC SPECIES IN MOONWORTS (BOTRYCHIUM SS, OPHIOGLOSSACEAE) 
  Author(s): Dauphin, Benjamin; Vieu, Julien; Grant, Jason R. 
  Source: AMERICAN JOURNAL OF BOTANY, 101 (1): 128-140 JAN 2014 
  Document Type: Article (Details)
• Title: Taxonomy and lectotypification of Vriesea fenestralis Linden et Andre (Bromeliaceae) 
  Author(s): de Moura, Ricardo Loyola; Grant, Jason R.; da Costa, Andrea Ferreira 
  Source: JOURNAL OF THE TORREY BOTANICAL SOCIETY, 140 (3): 329-333 SEP 2013 
  Document Type: Article (Details)

• Plant systematics
• Plant dispersal from Asia to North America
• Population genetics of Botrychium
• Patterns of speciation of plants in montane South America

• Floristics of Switzerland
• Herbarium studies