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.

• Transcriptome-wide SNPs for Botrychium lunaria ferns enable fine-grained analysis of ploidy and population structure
  Mossion, Vinciane; Dauphin, Benjamin; Grant, Jason; Kessler, Michael; Zemp, Niklaus; Croll, Daniel
  Molecular Ecology Resources 10.1111/1755-0998.13478  JAN 2022
• The Evolution of Trait Disparity during the Radiation of the Plant Genus Macrocarpaea (Gentianaceae) in the Tropical Andes
  Vieu, Julien C.; Koubinova, Darina; Grant, Jason R.
  Biology-basel 10.3390/biology10090825  SEP 2021
• A new species of Werauhia (Bromeliaceae: Tillandsioideae) from the Brazilian "Hylaea"
  Leme, Elton MC; Valsko, Jefferson J; Krahl, Amauri H; Grant, Jason R.
  Phytotaxa, 10.11646/phylotaxa.471.1.3, NOV 10 2020
• Outcrossing mating system of the early-divergent moonwort fern (Botrychium lunaria, Ophioglossaceae) revealed in the European Alps
  Dauphin, Benjamin; Grant, Jason R.; Farrar, Donald R.
  International Journal Of Plant Sciences, 10.1086/710491, NOV 2020
• Biotic and abiotic factors shape arbuscular mycorrhizal fungal communities associated with the roots of the widespread fern Botrychium lunaria (Ophioglossaceae)
  Sandoz, Frederic Alexandre; Bindschedler, Saskia; Dauphin, Benjamin; Farinelli, Laurent; Grant, Jason R.; Hervé V.
  Environmental Microbiology Reports, 12(3)  DOI: 10.1111/1758-2229.12840  2020
• Can biochemical phenotype, obtained from herbarium samples, help taxonomic decisions? - A case study using Gentianaceae
  Afzan, Adlin; Breant, Lise; Bellstedt, Dirk U.; Grant, Jason R.; Queiroz, Emerson F.; Wolfender, Jean-Luc); Kissling, Jonathan
  Taxon,  DOI: 10.1002/tax.12120, AUG 2019
• Rapid allopolyploid radiation of moonwort ferns (Botrychium; Ophioglossaceae) revealed by PacBio sequencing of homologous and homeologous nuclear regions
  Dauphin, B; Grant, JR; Farrar, DR; Rothfels, CJ
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 120 342-353; https://doi.org/10.1016/j.ympev.2017.11.025 MAR 2018
• L’herbier d’Abraham Gagnebin (1707-1800) du Musée d’histoire naturelle de La Chaux-de-Fonds.
  Chèvre M, Berret J, Goetschi F, Jacquat M, Grant JR. 2017.
  Bulletin de la Société neuchâteloise de Sciences naturelles 137 : 57-114.
• A Worldwide Molecular Phylogeny Provides New Insight on Cryptic Diversity Within the Moonworts (Botrychium s. s., Ophioglossaceae)
  Dauphin, B; Farrar, DR; Maccagni, A; Grant, JR
  SYSTEMATIC BOTANY, 42 (4): 10.1600/036364417X696483  2017
• Phylogeography of the moonwort fern Botrychium lunaria (Ophioglossaceae) based on chloroplast DNA in the Central-European Mountain System 
  Maccagni, Alessio; Parisod, Christian; Grant, Jason R. 
  ALPINE BOTANY, 127 (2): 185-196 10.1007/s00035-017-0188-8 2017
• A community-derived classification for extant lycophytes and ferns 
  Pteridophyte Phylogeny Grp. Schuettpelz, Eric; Schneider, Harald; Smith, Alan R.; et al. 
  JOURNAL OF SYSTEMATICS AND EVOLUTION, 54 (6): 563-603 https:doi.org/10.1111/jse.12229 2016
• …

• 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