Wetland Indicator Status (WIS) is a designation of the probability that a plant will be found in a wetland area. We use the designations from USDA PLANTS Database, specifically from the Atlantic and Gulf Coast Plain region. The description of each designation is listed below:
- Obligate wetland (OBL) - Almost always occurs in wetlands under natural conditions (estimated probability > 99%).
- Facultative wetland (FACW) - Usually occurs in wetlands (estimated probability 67% – 99%), but occasionally found in non-wetlands (estimated probability 1% – 33%).
- Facultative (FAC) - Equally likely to occur in wetlands and non-wetlands (estimated probability 34% – 66%).
- Facultative upland (FACU) - Usually occurs in non-wetlands (estimated probability 67% – 99%), but occasionally found in wetlands (estimated probability 1% – 33%).
- Obligate upland (UPL) - Almost always occurs in non-wetlands under natural conditions (estimated probability > 99%).
- No Indicator (NI) - This plant will not be found in a wetland.