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Mitella diphylla

L.

Twoleaf Bishop's-cap

G5Secure Found in 46 roadless areas NatureServe Explorer →
G5SecureGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.159708
Element CodePDSAX0N030
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderRosales
FamilySaxifragaceae
GenusMitella
Other Common Names
Mitrelle à deux feuilles (FR) Twoleaf Miterwort (EN) twoleaf miterwort (EN) Two-leaved Miterwort (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 Date2024-08-07
Change Date1984-06-08
Edition Date2024-08-07
Edition AuthorsSoteropoulos (2024)
Threat ImpactUnknown
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences> 300
Rank Reasons
Mitella diphylla is a wide-ranging perennial herb in forested habitats occurring in eastern North America from Quebec and Ontario, Canada south to Georgia west to Arkansas, United States. Potential threats include development, logging, 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
Mitella diphylla occurs in eastern North America from Quebec and Ontario, Canada south to Georgia west to Arkansas, United States (FNA 2002). Range extent was estimated to be over 2.3 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 3,000 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, logging, 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

Mitella diphylla grows in rich, mesic rocky forests, woods, hardwoods on ravine slopes, rocky seeps, and seepage swamps (FNA 2009, Weakley and the Southeastern Flora Team 2024).
Terrestrial Habitats
Forest/WoodlandForest - Hardwood
Palustrine Habitats
FORESTED WETLAND
Other Nations (2)
United StatesN5
ProvinceRankNative
New YorkS5Yes
PennsylvaniaS5Yes
OhioSNRYes
North CarolinaS3Yes
KentuckyS5Yes
New JerseyS4Yes
IowaS4Yes
IllinoisSNRYes
ArkansasS2Yes
MassachusettsSNRYes
New HampshireSNRYes
DelawareS2Yes
MarylandSNRYes
TennesseeSNRYes
GeorgiaS4Yes
MinnesotaSNRYes
AlabamaS1Yes
MississippiSNRYes
WisconsinSNRYes
MichiganSNRYes
ConnecticutSNRYes
VermontS5Yes
District of ColumbiaSNRYes
MissouriSNRYes
IndianaS4Yes
South CarolinaS1Yes
VirginiaSNRYes
West VirginiaS5Yes
CanadaN5
ProvinceRankNative
QuebecS4Yes
OntarioS5Yes
Threat Assessments
ThreatScopeSeverityTiming
Unknown/undetermined———

—

Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (46)
Arkansas (2)
AreaForestAcres
Clifty CanyonOzark-St. Francis National Forest1,963
Little BlakelyOuachita National Forest3,342
Kentucky (1)
AreaForestAcres
WolfpenDaniel Boone National Forest2,835
North Carolina (7)
AreaForestAcres
Bald MountainPisgah National Forest11,085
Balsam ConePisgah National Forest10,591
Cheoah BaldNantahala National Forest7,795
Craggy MountainPisgah National Forest2,657
Wesser BaldNantahala National Forest4,061
Wilson CreekPisgah National Forest4,863
Yellowhammer Branch (add.)Nantahala National Forest1,255
Pennsylvania (2)
AreaForestAcres
Allegheny FrontAllegheny National Forest7,430
Tracy RidgeAllegheny National Forest9,034
Tennessee (4)
AreaForestAcres
Bald MountainCherokee National Forest11,743
London Bridge BranchCherokee National Forest3,387
Sampson Mountain AdditionCherokee National Forest3,064
Stone MountainCherokee National Forest5,367
Vermont (1)
AreaForestAcres
Griffith Lake 09084Green Mountain and Finger Lakes National Forests1,833
Virginia (15)
AreaForestAcres
Bear CreekJefferson National Forest18,274
Beards MountainGeorge Washington National Forest7,505
Brush MountainJefferson National Forest6,002
Crawford MountainGeorge Washington National Forest9,892
Elliott KnobGeorge Washington National Forest9,380
Gum RunGeorge Washington National Forest12,620
Hoop HoleJefferson National Forest4,652
JerkemtightGeorge Washington National Forest16,687
Little AlleghanyGeorge Washington National Forest10,215
Little RiverGeorge Washington National Forest27,292
Mill MountainGeorge Washington National Forest10,840
Oak KnobGeorge Washington National Forest10,882
Ramseys Draft AdditionGeorge Washington National Forest12,781
SkidmoreGeorge Washington National Forest5,641
The PriestGeorge Washington National Forest5,737
West Virginia (12)
AreaForestAcres
Cranberry AdditionMonongahela National Forest11,123
Cranberry Glades Botanical AreaMonongahela National Forest785
Dolly Sods Roaring PlainMonongahela National Forest13,392
Dry ForkMonongahela National Forest657
Dry River (WV)George Washington National Forest7,331
East Fork Of GreenbrierMonongahela National Forest7,167
Falls Of Hills CreekMonongahela National Forest6,925
Glady ForkMonongahela National Forest3,239
Marlin MountainMonongahela National Forest9,344
Mcgowan MountainMonongahela National Forest10,504
Middle MountainMonongahela National Forest19,020
Seneca CreekMonongahela National Forest22,287
Wisconsin (2)
AreaForestAcres
09154 - St. Peters DomeChequamegon-Nicolet National Forest4,002
09159 - ThornappleChequamegon-Nicolet National Forest9,744
References (7)
  1. Flora of North America Editorial Committee (FNA). 2009. Flora of North America north of Mexico. Vol. 8. Magnoliophyta: Paeoniaceae to Ericaceae. Oxford University Press, New York. xxiv + 585 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.