This collection contains plant tissue collected from select plant species during plant diversity sampling (NEON sample class: div_geneticarchive_in.geneticSampleID). Plant species diversity is measured once or twice annually in the field. The plot-based method yields plant species data at multiple scales that provide an understanding of changes in composition, distribution, and abundance of native and non-native plant species. A subset of observed plant species is collected and archived. Leaf tissue is also collected and curated for analysis of plant genetic diversity over space and time. Leaf tissue collected in the field is immediately placed in coin envelopes, then into resealable plastic bags filled with desiccant to begin the air-drying process. Once dry, leaf tissue is shipped to the NEON Biorepository where it is archived in its original coin envelope at -80 degrees Celsius or transferred to a cryo-safe vial for archival in liquid nitrogen. See related links below for protocols and NEON related data products.