**6. Conclusions**

This review has established that the variability in waveband selection seen between studies, driven by study parameters beyond the characteristics of the target samples, prevents the determination of generalizable, high utility spectral regions for specific taxonomic discrimination. Broad trends such as the importance of VIS and red edge wavelengths are apparent, independent of plant groupings, though in and of themselves they are not sufficiently specific for taxonomic discrimination. The possibility of discriminatory spectral regions being associated with specific taxonomic, structural, or functional groupings of plants is inconclusive due to the large degree of variability between studies. This is further highlighted by the apparent dominance of feature selector choice over other parameters for waveband selection (Figures 6 and 7). Building on this review, future works could investigate variance in waveband selection caused by the hyperparameter choice of feature selectors, data preprocessing, as well as the inclusion of vegetation indices.

**Author Contributions:** Conceptualization, A.H.; methodology, A.H.; data curation, A.H.; formal analysis, A.H.; writing—original draft preparation, A.H., K.C. and M.L.; writing—review and editing, A.H., K.C., and M.L.; supervision, K.C., M.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** Financial support for this research was provided by the Australian Government Research Training Program Scholarship and the University of Adelaide School of Biological Sciences.

**Conflicts of Interest:** The authors declare no conflict of interest.
