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Bupleurum americanum

Coult. & Rose

American Thorowax

G5Secure Found in 26 roadless areas NatureServe Explorer →
G5SecureGlobal Rank
Identity
Unique IDELEMENT_GLOBAL.2.131994
Element CodePDAPI0F010
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderApiales
FamilyApiaceae
GenusBupleurum
Synonyms
Bupleurum sibiricum ssp. americanum(J.M. Coulter & Rose) KrasnoborovBupleurum triradiatum ssp. arcticum(Regel) Hulten
Other Common Names
American thorow wax (EN) Buplèvre d'Amérique (FR)
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.
Taxonomic Comments
Kartesz (1994) here includes Bupleurum arcticum in B. americanum. FNA (vol. 13 in prep.) treats them as distinct.
Conservation Status
Rank MethodExpertise without calculation
Review Date2016-07-19
Change Date1988-05-05
Ecology & Habitat

Description

Dwarf plant, only 2 cm tall; yellow flowers in condensed umbels that have a ring of fused green bracts beneath the flower heads. Unique in the Apiaceae because it has simple, undivided leaves.

Habitat

This species found in grasslands and meadows with rocky soil (Wildflower Center, 2021).
Terrestrial Habitats
Grassland/herbaceous
Other Nations (2)
United StatesNNR
ProvinceRankNative
AlaskaSNRYes
OregonS1Yes
WyomingS4Yes
UtahSNRYes
IdahoSNRYes
South DakotaS1Yes
ColoradoS1Yes
MontanaS4Yes
CanadaN4
ProvinceRankNative
Northwest TerritoriesS4Yes
Yukon TerritoryS4Yes
AlbertaS2Yes
Plant Characteristics
Economic Value (Genus)No
Roadless Areas (26)
Idaho (2)
AreaForestAcres
Borah PeakSalmon-Challis National Forest130,463
Italian PeakCaribou-Targhee National Forest141,158
Montana (18)
AreaForestAcres
Anaconda HillHelena National Forest18,546
Big BaldyLewis and Clark National Forest43,135
Big Snowy Mountains WsaLewis and Clark National Forest88,003
BridgerGallatin National Forest45,059
Burnt MountainCuster National Forest10,698
Crazy MountainGallatin National Forest82,093
Garfield MountainBeaverhead-Deerlodge National Forest41,891
Hyalite - Porcupine - Buffalo Horn Wilderness Study AreaGallatin National Forest143,991
Italian PeakBeaverhead-Deerlodge National Forest90,401
Line Creek PlateauCuster National Forest24,825
Middle Fork Judith WsaLewis and Clark National Forest81,131
Mt. Gmt Area HCuster National Forest1,335
North Big HoleBeaverhead-Deerlodge National Forest52,227
Proposed Line Creek PrnaCuster National Forest389
Red Lodge Creek HellroaringCuster National Forest17,210
Specimen CreekHelena National Forest12,368
Storm LakeBeaverhead-Deerlodge National Forest9,324
Tenderfoot - Deep CreekLewis and Clark National Forest85,614
Wyoming (6)
AreaForestAcres
Beartooth Proposed WildernessShoshone National Forest16,837
Cloud Peak ContiguousBighorn National Forest113,757
Devils CanyonBighorn National Forest37,416
Horse Creek MesaBighorn National Forest77,808
Little BighornBighorn National Forest133,949
South Beartooth HighwayShoshone National Forest105,570
References (2)
  1. 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.
  2. Wildflower Center. 2021. Native Plant Database: <i>Bupleurum americanum</i>. Lady Bird Johnson Wildflower Center, University of Texas, Austin. Accessed: September 6, 2022. https://www.wildflower.org/plants/result.php?id_plant=BUAM2