OBL - Obligate Wetland
Occurs with an estimated 99% probability in wetlands.

FACW - Facultative Wetland
Estimated 67-99% probability of occurrence in wetlands.

FAC - Facultative
Equally likely to occur in wetlands and nonwetlands.

FACU - Facultative Upland
67-99% probability in nonwetlands. 1-33% in wetlands.

UPL - Obligate Upland
>99% nonwetland (if a species doesn't occur in wetlands in any region, it is not included on the National List)

NI - No Indicator
Insufficient information available to determine status.

    + indicates a frequency toward the higher end of a category

    - indicates a frequency toward the lower end of a category.

Indicator status is based on available information, and does not always reflect the full range of each plant species. Status is sometimes different in different regions.