(Small) Fern.
Identity
Unique IDELEMENT_GLOBAL.2.141370
Element CodePDLAM1N0M0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderLamiales
FamilyLamiaceae
GenusPycnanthemum
Other Common NamesBeadle's mountainmint (EN)
Concept ReferenceKartesz, 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.
Taxonomic CommentsA tetraploid species, probably derived from P. montanum x muticum (Amoroso, J. 6/96).
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2024-11-21
Change Date2024-11-21
Edition Date2024-11-21
Edition AuthorsJ. Amoroso (1996), rev. C. Nordman (2018), rev. N. Ventrella (2024)
Threat ImpactMedium
Range Extent20,000-200,000 square km (about 8000-80,000 square miles)
Number of Occurrences6 - 80
Rank ReasonsPycnanthemum beadlei is a perennial forb occurring in open forests, woodlands, woodland and forest edges, roadsides, and in utility rights-of-ways of the southern and central Appalachian Mountains region, ranging from West Virginia south to northwestern South Carolina and northeastern Georgia. Its distribution and abundance are poorly known, particularly in Virginia, but it is rare to uncommon throughout most of its range. Threats to this species include land-use conversion and habitat degradation, the use of herbicides for management of rights-of-ways, and forest succession.
Range Extent CommentsPycnanthemum beadlei occurs in the southeastern United States as a southern and central Appalachian endemic species, ranging from West Virginia south to northwestern South Carolina and northeastern Georgia (LeGrand et al. 2024, Weakley and the Southeastern Flora Team 2024). Range extent was estimated using herbarium specimens, photo-based observations, and NatureServe Network occurrence data collected between 1993 and 2024 (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024).
Occurrences CommentsBy 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 thirteen occurrences rangewide (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024). However, not all collections are georeferenced, and anecdotal comments support the likelihood that there are over twenty occurrences.
Threat Impact CommentsPycnanthemum beadlei is somewhat threatened by land-use conversion and habitat fragmentation (Southern Appalachian Species Viability Project 2002). The use of some herbicides (which affect dicots) for roadside and utility line rights-of-way management is a threat. Forest succession leading to tree canopy closure and shading of the forest understory can degrade habitat for this plant, which prefers a semi-open canopy. Numerous invasive exotic plants which can dominate forest edges and rights-of-way are also threats.