Home/Species/ Savanna Iris

Iris tridentata

Pursh

Savanna Iris

G3Vulnerable (G3G4) Found in 4 roadless areas NatureServe Explorer →

G3VulnerableGlobal Rank

Medium - lowThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.151046

Element CodePMIRI09130

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

KingdomPlantae

PhylumAnthophyta

ClassMonocotyledoneae

OrderLiliales

FamilyIridaceae

GenusIris

Other Common Names

savannah iris (EN)

Concept Reference

Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

Conservation Status

Rank MethodLegacy Rank calculation - Excel v3.1x

Review Date2013-02-05

Change Date1993-07-09

Edition Date2013-02-05

Edition AuthorsStoner, N. (1993), rev. J. Beckman (1996), rev. C. Nordman (2013).

Threat ImpactMedium - low

Range Extent20,000-200,000 square km (about 8000-80,000 square miles)

Number of Occurrences81 to >300

Rank Reasons

Limited to the Coastal Plain in wet forests, bogs and ditches. Common in the Carolinas but less frequent in the southern part of its range.

Range Extent Comments

On the Atlantic Coastal Plain, from southeastern North Carolina to southeast Georgia (NatureServe central database as of November 2012), and northeast Florida (Wunderlin and Hansen 2003). Also on the Gulf Coastal Plain in the Florida Panhandle (Godfrey and Wooten 1981) and also southwestern Alabama (Flora of North America Editorial Committee 2002, Thomas and Allen 1993).

Occurrences Comments

Common in the Coastal Plain of South Carolina (Porcher and Rayner 2001) and adjacent North Carolina. Reports from nine counties in South Carolina, seven counties in North Carolina (Radford et al. 1968); multiple counties in the Florida panhandle (Clewell 1985); and three counties in southeast Georgia (Jones and Coile 1988, NatureServe central database as of November 2012).

Threat Impact Comments

Threats include alteration of site hydrology, development such as commercial or residential, and impacts from intensive forestry (e.g. bedding for site preparation).

Ecology & Habitat

Description

A rhizomatous perennial, flowering stalks 12-28" tall (30 - 70 cm), usually unbranched, bearing a single blue-violet flower with yellow towards the base of the showy sepals. Rhizomes clothed with coarse, strongly many-ribbed, brown, overlapping scales (Porcher and Rayner 2001, Godfrey and Wooten 1979).

Habitat

Seasonally wet pine savannas and flatwoods, borders of cypress-gum ponds, bogs, ditches.

Other Nations (1)

United StatesNNR

Province	Rank	Native
Florida	SNR	Yes
Georgia	S2	Yes
North Carolina	S2	Yes
South Carolina	S4	Yes

Threat Assessments

Threat	Scope	Severity	Timing
1 - Residential & commercial development	Restricted - small	Serious - moderate	Moderate (short-term)
1.1 - Housing & urban areas	Small (1-10%)	Moderate or 11-30% pop. decline	Moderate (short-term)
1.2 - Commercial & industrial areas	Small (1-10%)	Moderate or 11-30% pop. decline	Moderate (short-term)
2 - Agriculture & aquaculture	Restricted (11-30%)	Moderate or 11-30% pop. decline	Moderate (short-term)
2.2 - Wood & pulp plantations	Restricted (11-30%)	Moderate or 11-30% pop. decline	Moderate (short-term)
7 - Natural system modifications	Small (1-10%)	Moderate or 11-30% pop. decline	Moderate (short-term)
7.2 - Dams & water management/use	Small (1-10%)	Moderate or 11-30% pop. decline	Moderate (short-term)

Plant Characteristics

DurationPERENNIAL

Economic Value (Genus)No

Roadless Areas (4)

Florida (3)

Area	Forest	Acres
Gum Bay	Apalachicola National Forest	11,645
Long Bay	Apalachicola National Forest	5,726
Savannah	Apalachicola National Forest	1,927

South Carolina (1)

Area	Forest	Acres
Wambaw Ext	Francis Marion National Forest	527

References (11)

Clewell, A.F. 1985. Guide to vascular plants of the Florida panhandle. Florida State Univ. Press, Tallahassee, Florida. 605 pp.
Flora of North America Editorial Committee (FNA). 2002a. Flora of North America north of Mexico. Vol. 26. Magnoliophyta: Liliidae: Liliales and Orchidales. Oxford Univ. Press, New York. xxvi + 723 pp.
Godfrey, R.K., and J.W. Wooten. 1981. Aquatic and wetland plants of southeastern United States: Dicotyledons. Univ. Georgia Press, Athens. 933 pp.
Jones, S.B., Jr., and N.C. Coile. 1988. The distribution of the vascular flora of Georgia. Dept. Botany, Univ. Georgia, Athens. 230 pp.
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Long, R.W., and O. Lakela. 1971. A flora of tropical Florida. Univ. Miami Press, Coral Gables, Florida. 962 pp.
Porcher, R. D., and D. A. Rayner. 2001. A guide to the wildflowers of South Carolina. University of South Carolina Press, Columbia. 551 pp.
Radford, A.E., H.E. Ahles, and C.R. Bell. 1968. Manual of the vascular flora of the Carolinas. Univ. North Carolina Press, Chapel Hill, NC. 1183 pp.
Small, J.K. 1933. Manual of the southeastern flora. Two volumes. Hafner Publishing Company, New York.
Thomas, R.D., and C.M. Allen. 1993. Atlas of the vascular flora of Louisiana. Volume 1: Ferns and fern allies, conifers, and monocotyledons. Louisiana Dept. Wildlife and Fisheries, Baton Rouge. 217 pp.
Wunderlin, R.P. and B.F. Hansen. 2003. Guide to the Vascular Plants of Florida. 2nd edition. University Press of Florida, Tampa. 788 pp.

Iris tridentata

Description

Habitat

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