United States Department of Agriculture
Natural Resources Conservation Service
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plants download logoSymbols for Unknown Plants Developed

The NRCS National Plant Data Center has developed a list of symbols for unknown plants. The cross-Federal agency standardized list consists of symbols (beginning with the numeral 2) to represent "unknowns" in plant transects and inventories. These symbols are useful to field staff involved in the National Resources Inventory, grazing lands survey, and other inventories when a plant cannot be identified to species or genus, but should be recorded. This new list contains over one hundred "unknowns" ranging from 2FA=annual forb or 2LTR=litter to 2SDBD=shrub, deciduous, broadleaf, dicot. The list of these symbols is maintained by the National Plant Data Center and is available at http://plants.usda.gov/cgi_bin/topics.cgi?earl=dl_unknown.html.
Your contact is Scott Peterson, Director NRCS National Plant Data Center, at 225-775-6280 ext. 11 or scott.peterson@usda.gov.