Table 1 

 Plant Indicator Status Categories* 



Indicator Category 



OBLIGATE WETLAND 

 PLANTS 



Indicator 



Symbol 



OBL 



FACULTATIVE WETLAND FACW 

 PLANTS 



FACULTATIVE PLANTS 



FAC 



FACULTATIVE UPLAND 

 PLANTS 



FACU 



OBLIGATE UPLAND 

 PLANTS 



UPL 



Definition 



Plants that occur almost always (estimated 

 probability >99%) in wetlands under natural 

 conditions, but which may also occur rarely 

 (estimated probability <1%) in nonwetlands. 

 Examples: Spartina altemi flora, Taxodium 

 distichwn. 



Plants that occur usually (estimated probabil- 

 ity >67% to 99%) in wetlands, but also occur 

 (estimated probability 1% to 33% in nonwet- 

 lands). Examples: Fraxinus pennsylvanioa, 

 Cornus stolonifera. 



Plants with a similar likelihood (estimated 

 probability 33% to 67%) of occurring in both 

 wetlands and nonwetlands. Examples: 



Gleditsia triaaanthos, Smilax rotundifolia. 



Plants that occur sometimes (estimated prob- 

 ability 1% to <33%) in wetlands, but occur 

 more often (estimated probability >67% to 

 99%) in nonwetlands. Examples: Quercus 

 rubra, Potentilla avguta. 



Plants that occur rarely (estimated probabil- 

 ity <1%) in wetlands, but occur almost 

 always (estimated probability >99%) in 

 nonwetlands under natural conditions. 

 Examples: Pinus echinata, Bronrus mollis. 



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* Categories were originally developed and defined by the USFWS National 

 Wetlands Inventory and subsequently modified by the National Plant List 

 Panel. The three facultative categories are subdivided by (+) and (-) 

 modifiers (see Appendix C, Section 1). 



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