- 2019 - 2024 A study of plant specimens from the Edo Period.
- 2020 - 2023 Scientific utilization of plant specimens collected by Herbarium Hajacawa and verification of sampling activities by plant hunters
- 2017 - 2022 How was the diversification of wild Adonis plants involved in domestication of classical garden plants, "Fukuju-so"?
- 2016 - 2021 中国横断山脈とマレー半島をつなぐ植物回廊:植物の高い種多様性と南北移動史の解明
- 2016 - 2020 Estimation of nature system and natural environment of Edo Period based on Siebold Colleciton
- 2014 - 2017 Phylogeographic analyses of phytophagous insects and their hostplants in Himalayan region
- 2013 - 2017 Phylogeographical study for Patrinia villosa (Valerianaceae), having conspicuous infraspecific polyploidy
- 2013 - 2016 Speciation and phenological analyses of ancestral Carex (Cyperaceae)
- 2012 - 2016 Research on plant specimens collected at the beginning of University of Tokyo for the early study of Japanese botany.
- 2012 - 2016 The selection of the original material and the designation of the lectotype of the taxa described by Siebold, and Siebold & Zuccarini from Japan between 1828 and 1867
- 2011 - 2015 Systematic analyses for the Pan-Himalayan flora based on genetical and species diversities
- 2009 - 2014 Phylogeographical studies of the genus Carex based on DNA sequences
- 2010 - 2012 Phylogeographical study on widely-distributed and local endemicspecies
- 2008 - 2012 Studies on the diversity and taxonomy of Ephedra plants.
- 2006 - 2009 Molecular genetics, phytogeography, and biosystematic studies for alpine flora of the Himalayas
- 2007 - 2008 Molecular phylogeny and systematic revision of Carex (Cyperaceae)
- 2005 - 2007 Studes on the morphologicl and chemical diversities of Ephedra pants
- 2002 - 2004 Adaptation of Plants of Sino-Japanese Floristic Elements against to Environments of Asian Islands
- 2002 - 2004 Biogeographical researches on Sino-Himalayan floristic region
- 1999 - 2001 Biogeographical research on the present Himalayan flora
- 1996 - 1998 The plant species diversity in southern Tibetan Plateau
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