Plant Description Classifications

Plant Description Classifications

Seed Spread Rate
None, Slow, Moderate, Rapid, Unknown
Vegetative Spread Rate
None, Slow, Moderate, Rapid, Unknown
Shape/Growth Form
Bunch, Colonizing, Multiple Stem, Rhizomatous, Single Crown, Single Stem, Stoloniferous, Thicket Forming
Shape & Orientation
Climbing, Columnar, Conical, Decumbent, Erect, Irregular, Oval, Prostrate, Rounded, Semi-Erect, Vase
Drought Tolerance
None, Low, Medium, High
Shade Tolerance
Intolerant, Indeterminate, Tolerant
Moisture Requirements
Low, Medium, High
After-Harvest Regrowth Rate
Slow, Moderate, Rapid, Unknown
Salinity Tolerance
None, Low, Medium, High
C:N Ratio
Low, Medium, High, Unknown
CaCO3 Tolerance
None, Low, Medium, High, Unknown
Nitrogen Fixation
None, Low, Moderate, High, Unknown
None, Low, Medium, High, Unknown

USDA Plant Status Categories

Courtesy of the USDA

Wetland Descriptions

Indicator Code Wetland Type Comment
OBL Obligate Wetland Occurs almost always (estimated probability 99%) under natural conditions in wetlands.
FACW Facultative Wetland Usually occurs in wetlands (estimated probability 67%-99%), but occasionally found in non-wetlands.
FAC Facultative Equally likely to occur in wetlands or non-wetlands (estimated probability 34%-66%).
FACU Facultative Upland Usually occurs in non-wetlands (estimated probability 67%-99%), but occasionally found on wetlands (estimated probability 1%-33%).
UPL Obligate Upland Occurs in wetlands in another region, but occurs almost always (estimated probability 99%) under natural conditions in non-wetlands in the regions specified. If a species does not occur in wetlands in any region, it is not on the National List.
NA No agreement The regional panel was not able to reach a unanimous decision on this species.
NI No indicator Insufficient information was available to determine an indicator status.
NO No occurrence The species does not occur in that region.

National Indicators reflect the range ofestimated probabilities (expressed as a frequency of occurrence)of a species occurring in wetlands versus non-wetland acrossthe entire distribution of the species. A frequency, for example,of 67%-99% (Facultative Wetland) means that 67%-99% of sampleplots containing the species randomly selected across the rangeof the species would be wetland. When two indicators are given,they reflect the range from the lowest to the highest frequencyof occurrence in wetlands across the regions in which the speciesis found. A positive (+) or negative (-) sign was used withthe Facultative Indicator categories to more specifically definethe regional frequency of occurrence in wetlands. The positivesign indicates a frequency toward the higher end of the category(more frequently found in wetlands), and a negative sign indicatesa frequency toward the lower end of the category (less frequentlyfound in wetlands). A question mark (?) following a NationalIndicator denotes a tentative assignment based on the botanicalliterature and not confirmed by regional review.

Regional Indicators express the estimatedprobability (likelihood) of a species occurring in wetlandsversus non-wetlands in the region. Regional Indicators reflectthe unanimous agreement of the Regional Interagency ReviewPanel. An asterisk (*) following a regional Indicator identifiestentative assignments based on limited information from whichto determine the indicator status.

The wetland indicator categories should not be equated todegrees of wetness. Many obligate wetland species occur inpermanently or semi-permanently flooded wetlands, but a numberof obligates also occur in and some are restricted to wetlandswhich are only temporarily or seasonally flooded. The facultativeupland species include a diverse collection of plants, whichrange from weedy species adapted to exist in a number of environmentallystressful or disturbed sites (including wetlands), to speciesin which a portion of the gene pool (an ecotype) always occursin wetlands. Both the weedy and ecotype representatives ofthe facultative upland category occur in seasonally and semi-permanentlyflooded wetlands.

Regions Defined by the USDA

Code Region Geographic areas in region
1 Northeast CT, DE, KY, MA, MD, ME, NH, NJ, NY, OH, PA, RI, VA, VT, WV
2 Southeast AL, AR, FL, GA, LA, MS, NC, SC, TN
3 North Central IA, IL, IN, MI, MN, MO, WI
4 North Plains MT (Eastern), ND, SD, WY (Eastern)
5 Central Plains CO (Eastern), NE, KS
6 South Plains OK, TX
7 Southwest AZ, NM
8 Intermountain CO (Western), NV, UT
9 Northwest ID, OR, MT (Western), WA, WY (Western)
0 California CA
A Alaska AK
C Caribbean PR (Puerto Rico), VI (U.S. Virgin Islands)
H Hawaii HI (Hawaiian Islands), AS (American Samoa), FM (Federated States of Micronesia), GU (Guam), MH (Marshal Islands), MP (Northern Mariana Islands), PW (Palau), UM (U.S. Minor Outlying Islands)

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