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Hieracium marianum

Willd.

Maryland Hawkweed

G4Apparently Secure Found in 1 roadless area NatureServe Explorer →
G4Apparently SecureGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.133479
Element CodePDAST4W1U0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusHieracium
Synonyms
Hieracium x marianumWilld. (pro sp.)
Other Common Names
Épervière du Maryland (FR)
Concept Reference
Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Taxonomic Comments
Treated as a hybrid by Kartesz (1994). FNA (vol. 19, 2006) says that the type of Hieracium marianum may have resulted from a cross between plants of H. venosum and H. gronovii or H. scabrum (M. L. Fernald 1943c).
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2024-05-15
Change Date2002-10-19
Edition Date2024-05-15
Edition AuthorsSoteropoulos (2024)
Threat ImpactUnknown
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences21 - 300
Rank Reasons
Hieracium marianum is a wide-ranging perennial herb in open woodlands and roadsides occurring in the eastern United States from New Hampshire and Maine west to Ohio and south to Georgia and Alabama. Threats include development, roadside maintenance activities, and invasive species. With a large range extent and likely number of occurrences, abundant habitat, broad habitat preferences, and no obvious intrinsic vulnerabilities, this species is considered secure.
Range Extent Comments
Hieracium marianum occurs in the eastern United States from New Hampshire and Maine west to Ohio and south to Georgia and Alabama (Weakley and the Southeastern Flora Team 2024). Range extent was estimated to be over 900,000 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 only 25 occurrences rangewide (GBIF 2024, iNaturalist 2024, NatureServe 2024, SEINet 2024). Due to different treatments of this entity (some floras do not consider it distinct or treat it as a hybrid), herbarium records and photo-based observations may underrepresent true abundance, not all collections are georeferenced, and anecdotal comments support the likelihood that there are over 81 occurrences rangewide.
Threat Impact Comments
Although threats are not widely documented, this species is potentially threatened by development, roadside maintenance activities, invasive species, and other threats in some places.
Ecology & Habitat

Habitat

Hieracium marianum grows in "dry forests, woodland margins, roadsides" (Weakley and the Southeastern Flora Team 2024).
Terrestrial Habitats
Forest EdgeWoodland - HardwoodWoodland - ConiferWoodland - Mixed
Other Nations (2)
CanadaNNA
ProvinceRankNative
OntarioSNAYes
United StatesN4
ProvinceRankNative
FloridaSNRYes
AlabamaSNRYes
ConnecticutSNRYes
New HampshireSNRYes
MassachusettsSNRYes
MichiganSNRYes
VermontSNRYes
GeorgiaSNRYes
New JerseySHYes
MississippiSNRYes
District of ColumbiaSNAYes
South CarolinaSNRYes
PennsylvaniaSNRYes
West VirginiaS2Yes
New YorkSNRYes
MarylandSNRYes
North CarolinaS4Yes
MaineSNRYes
Threat Assessments
ThreatScopeSeverityTiming
Unknown/undetermined———

—

Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (1)
Arkansas (1)
AreaForestAcres
Gee CreekOzark-St. Francis National Forest7,957
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. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
  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.