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Hieracium horridum

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Shaggy Hawkweed

G4Apparently Secure Found in 62 roadless areas NatureServe Explorer →
G4Apparently SecureGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.147211
Element CodePDAST4W0N0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusHieracium
Other Common Names
prickly hawkweed (EN) Prickly Hawkweed (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 Date2024-05-15
Change Date1988-05-16
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 Occurrences81 - 300
Rank Reasons
Hieracium horridum is a wide-ranging perennial herb occurring in the western United States in California, southern Oregon, and western Nevada. Threats include logging and invasive species. With a large range extent and number of occurrences, abundant habitat, broad habitat preferences, and no obvious intrinsic vulnerabilities, this species is considered secure.
Range Extent Comments
Hieracium horridum occurs in the western United States in California, southern Oregon, and western Nevada. Range extent was estimated to be almost 290,000 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 and photo-based observations documented between 1993 and 2024, it is estimated that there are 288 occurrences rangewide (GBIF 2024, iNaturalist 2024, SEINet 2024).
Threat Impact Comments
Although threats are not widely documented, this species is potentially threatened by logging, invasive species, and other threats in some places.
Ecology & Habitat

Habitat

Hieracium horridum grows in "boulders, gravels, meadows, pine forests" (FNA 2006).
Terrestrial Habitats
Forest - ConiferGrassland/herbaceousBare rock/talus/scree
Other Nations (1)
United StatesN4
ProvinceRankNative
CaliforniaSNRYes
OregonS1Yes
NevadaS2Yes
Threat Assessments
ThreatScopeSeverityTiming
Unknown/undetermined———

—

Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (62)
California (60)
AreaForestAcres
AgnewSequoia National Forest9,561
Bell MeadowStanislaus National Forest7,968
Black CinderLassen National Forest239
Black Mtn.Sequoia National Forest15,102
Caples CreekEldorado National Forest17,854
Carson - IcebergStanislaus National Forest56,430
ChannellSequoia National Forest45,429
ChicoSequoia National Forest39,836
Coyote SoutheastInyo National Forest53,159
DardanellesEldorado National Forest8,110
Dinkey LakesSierra National Forest34,171
DomeStanislaus National Forest11,085
Domeland Add.Sequoia National Forest3,046
EagleStanislaus National Forest16,116
East YubaTahoe National Forest17,968
EbbettsHumboldt-Toiyabe National Forest255
Fawn LakeEldorado National Forest1,153
Granite ChiefTahoe National Forest6,546
Hall Natural AreaInyo National Forest5,236
Heart LakeLassen National Forest9,349
Hoover - Mt.olsenHumboldt-Toiyabe National Forest624
Hoover - NorthHumboldt-Toiyabe National Forest1,574
Hoover - Virginia LksHumboldt-Toiyabe National Forest5,050
Horse Mdw.Inyo National Forest5,687
HortonInyo National Forest5,717
Iceberg - Mill CreekHumboldt-Toiyabe National Forest26,988
Jennie LakeSequoia National Forest2,388
Kings RiverSierra National Forest52,999
Lake EleanorShasta-Trinity National Forest397
Mokelumne - SprattHumboldt-Toiyabe National Forest613
Mono CratersInyo National Forest7,115
MosesSequoia National Forest22,077
Mt. OlsenInyo National Forest2,161
Mt. RebaStanislaus National Forest3,869
Mt. Shasta AShasta-Trinity National Forest676
Mt. Shasta BShasta-Trinity National Forest2,809
NessieInyo National Forest830
NightStanislaus National Forest3,173
North LakeInyo National Forest2,406
ProspectLassen National Forest4,078
PyramidEldorado National Forest24,347
Raymond PeakEldorado National Forest2,518
Raymond PeakStanislaus National Forest3,646
RinconSequoia National Forest54,610
Rock Creek WestInyo National Forest3,626
San JoaquinSierra National Forest22,474
SherwinInyo National Forest3,140
ShuteyeSierra National Forest7,313
Slate Mtn.Sequoia National Forest12,299
South SierraSequoia National Forest8,008
Table Mtn.Inyo National Forest4,215
TinemahaInyo National Forest27,060
Tioga LakeInyo National Forest829
Tragedy - Elephants BackEldorado National Forest20,866
WaterhouseStanislaus National Forest4,394
Wheeler RidgeInyo National Forest15,744
Wild Cattle MtnLassen National Forest4,965
Wonoga Pk.Inyo National Forest11,272
WoodpeckerSequoia National Forest11,936
WoolstaffSequoia National Forest41,445
Nevada (2)
AreaForestAcres
Jobs Peak (NV)Humboldt-Toiyabe National Forest1,342
Rose - GalenaHumboldt-Toiyabe National Forest3,711
References (6)
  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).