Herb species occurrence data across the US
This is a dataset of the abundance of herbaceous species across ~15,000 plots across the US, along with related site date (e.g. climate, soil pH, etc.). 

This dataset is associated with the following publication:
Clark, C., S. Simkin, E. Allen, W. Bowman, J. Belnap, M. Brooks, S. Collins, L. Geiser, F. Gilliam, S. …