California Botanists are doing a better job vouchering weeds

Based on analysis of 141,500 CCH specimens of non-native plants from California, it is patently evident that we are doing a better job of vouchering weeds.  Herbarium specimens are time-consuming to collect, even more time consuming to key, label and mount, yet the graph above shows that the recent trend is upward (and, discount the actual accession rate for 2005 and beyond because of backlog of unprocessed material).  Remaining humble, we must remember that our now departed mentors of the 1930s, and departed or soon to be departed friends of the 1960s did their job well.