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Home/Species/ Two-flower Dwarf-dandelion

Krigia biflora

(Walt.) Blake

Two-flower Dwarf-dandelion

G5Secure Found in 11 roadless areas NatureServe Explorer →
G5SecureGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.138036
Element CodePDAST5D010
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusKrigia
Other Common Names
Krigie à deux fleurs (FR) twoflower dwarfdandelion (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 Method Rank calculation - Biotics v2
Review Date2024-06-05
Change Date1985-10-11
Edition Date2024-06-05
Edition AuthorsSoteropoulos (2024)
Threat ImpactUnknown
Range Extent>2,500,000 square km (greater than 1,000,000 square miles)
Number of Occurrences> 300
Rank Reasons
Krigia biflora is a wide-ranging perennial herb in Eastern deciduous woodlands, tallgrass prairie, Rocky Mountain forest, and Madrean woodlands occurring in eastern and central North America from Ontario and Manitoba in Canada south to Georgia west to Arkansas, Colorado, and Arizona in the United States. There are two varieties, with the typic variety widespread in the eastern portion of the range and the smaller, var. viridis, restricted to Colorado, Arizona, and New Mexico. Threats include development, silviculture, rights-of-way maintenance activities, recreation, and invasive species. Little is known about trends, but with a large range extent and large number of occurrences, abundant habitat, broad habitat preferences, and no obvious intrinsic vulnerabilities, this species is considered secure.
Range Extent Comments
Krigia biflora occurs in eastern and central North America from Ontario and Manitoba in Canada south to Georgia west to Arkansas, Colorado, and Arizona in the United States (FNA 2006). There are two varieties, with the typic variety widespread in the eastern portion of the range and the smaller, var. viridis, restricted to Colorado, Arizona, and New Mexico (Weakley and the Southeastern Flora Team 2024). Range extent was estimated to be over 4.4 million square kilometers using herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1993 and 2024 (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024).
Occurrences Comments
By applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1993 and 2024, it is estimated that there are over 1,500 occurrences rangewide (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024).
Threat Impact Comments
Although threats are not widely documented, this species is potentially threatened by development, silviculture, rights-of-way maintenance activities, recreation, invasive species, and other threats in some places. However, their overall impact is likely negligible given the species' broad range, large number of occurrences, and no obvious intrinsic vulnerabilities.
Ecology & Habitat

Habitat

Krigia biflora grows in "sandy, loam, or humus soils, shaded mixed mesophytic, beach-maple, oak-pine, and oak-hickory woods, often near streams, meadows, moist prairies, and Madrean woodlands" (FNA 2006).
Terrestrial Habitats
Woodland - HardwoodWoodland - MixedGrassland/herbaceous
Other Nations (2)
United StatesN5
ProvinceRankNative
KentuckyS5Yes
DelawareSHYes
OklahomaSNRYes
MichiganSNRYes
North CarolinaS2Yes
IndianaSNRYes
OhioSNRYes
ConnecticutS1Yes
VirginiaS4Yes
MississippiSNRYes
IllinoisSNRYes
New MexicoSNRYes
PennsylvaniaS5Yes
GeorgiaSNRYes
MinnesotaSNRYes
IowaS4Yes
ArkansasSNRYes
MissouriSNRYes
South CarolinaSNRYes
ArizonaSNRYes
MassachusettsSNRYes
New YorkS4Yes
TennesseeSNRYes
ColoradoS2Yes
WisconsinSNRYes
KansasS1Yes
New JerseySNRYes
AlabamaSNRYes
West VirginiaS5Yes
CanadaN2
ProvinceRankNative
ManitobaS2Yes
OntarioS2Yes
Threat Assessments
ThreatScopeSeverityTiming
Unknown/undetermined———

—

Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (11)
Alabama (2)
AreaForestAcres
Blue MountainTalladega National Forest4,986
Oakey MountainTalladega National Forest6,129
Arkansas (4)
AreaForestAcres
Clifty CanyonOzark-St. Francis National Forest1,963
Gee CreekOzark-St. Francis National Forest7,957
Pedestal RocksOzark-St. Francis National Forest21,957
Richland CreekOzark-St. Francis National Forest571
Indiana (1)
AreaForestAcres
Mogan RidgeHoosier National Forest8,435
Kentucky (1)
AreaForestAcres
WolfpenDaniel Boone National Forest2,835
Missouri (2)
AreaForestAcres
Irish Rare II Study AreaMark Twain National Forest1,226
Swan Creek Rare II Study AreaMark Twain National Forest7,310
West Virginia (1)
AreaForestAcres
Cheat MountainMonongahela National Forest8,191
References (7)
  1. Flora of North America Editorial Committee (FNA). 2006a. Flora of North America north of Mexico. Vol. 19. Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford University Press, New York. xxiv + 579 pp.
  2. Global Biodiversity Information Facility (GBIF). 2024. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2024).
  3. iNaturalist. 2024. Online. Available: https://www.inaturalist.org (accessed 2024).
  4. 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.
  5. NatureServe. 2024. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  6. Southwest Environmental Information Network (SEINet). 2024. Collections Databases. Online. Available: https://swbiodiversity.org/seinet/collections/index.php (accessed 2024).
  7. Weakley, A.S., and Southeastern Flora Team. 2024. Flora of the southeastern United States. Edition of March 4, 2024. University of North Carolina Herbarium (NCU), North Carolina Botanical Garden, University of North Carolina, Chapel Hill. 2203 pp.