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Heterotheca oregona

(Nutt.) Shinners

Oregon False Goldenaster

G4Apparently Secure Found in 8 roadless areas NatureServe Explorer →
G4Apparently SecureGlobal Rank
Medium - lowThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.138410
Element CodePDAST4V0G0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusHeterotheca
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
Heterotheca oregona is a species comprised of four varieties, distinguishable based on sets of habitat, leaf and pubescence traits (Flora of North America Editorial Committee 2006, Kartesz 1994, Semple et al. 1988).
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2023-08-28
Change Date1988-05-16
Edition Date2023-08-28
Edition AuthorsNordman, C. (2023).
Threat ImpactMedium - low
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences81 - 300
Rank Reasons
Heterotheca oregona occurs in the western United States, from the Olympic Peninsula in western Washington, in the Cascade Range and Coastal Range, south to San Luis Obisbo County, California. There are estimated to be between 81 and 300 occurrences, including on several National Forests, and other federal and state public lands. Threats include impacts from dams, especially the inundation of populations on cobblebars, and recreational activities, such as at takeout locations. Seasonal flooding is probably important for maintaining the habitat of this plant
Range Extent Comments
Heterotheca oregona occurs in the western United States, from the Olympic Peninsula in western Washington, in the Cascade Range and Coastal Range, south to San Luis Obisbo County, California. Range extent was estimated to be 350,0000 square kilometers using herbarium specimens, photo-based observations, and NatureServe Network occurrence data collected between 1991 and 2023 (CCH2 Portal 2023, Flora of North America Editorial Committee 2006, GBIF 2023, iNaturalist 2023, NatureServe 2023, SEINet 2023, Semple et al. 1988).
Occurrences Comments
Based on NatureServe Network occurrence data, herbarium records, and photo-based observations documented between 1991 and 2023, and anecdotal evidence, there are between 81 and 300 occurrences rangewide (CCH2 Portal 2023, GBIF 2023, iNaturalist 2023, NatureServe 2023, SEINet 2023).
Threat Impact Comments
Threats to Heterotheca oregona include impacts from dams, especially the inundation of populations on cobblebars, and recreational activities, such as at takeout locations (NatureServe 2023). Seasonal flooding is probably important for maintaining the habitat of this plant (WA NHP 2013).
Ecology & Habitat

Habitat

This species is found on gravel and sand bars along rivers and streams, stream margins in oak and conifer woods, at the edge of conifer forests, along arroyos, and on disturbed roadbanks (Flora of North America Editorial Committee 2006, WA NHP 2013).

Ecology

Seasonal flooding is probably important for maintaining the habitat of this plant (WA NHP 2013).

Reproduction

Heterotheca oregona blooms late in the season, in August, in Washington state (NatureServe 2023).
Terrestrial Habitats
Forest EdgeWoodland - HardwoodWoodland - Conifer
Palustrine Habitats
Riparian
Other Nations (1)
United StatesN4
ProvinceRankNative
WashingtonS2Yes
CaliforniaSNRYes
OregonSNRYes
Threat Assessments
ThreatScopeSeverityTiming
6 - Human intrusions & disturbanceSmall (1-10%)Moderate or 11-30% pop. declineHigh (continuing)
6.1 - Recreational activitiesSmall (1-10%)Moderate or 11-30% pop. declineHigh (continuing)
7 - Natural system modificationsRestricted - smallSerious or 31-70% pop. declineHigh (continuing)
7.2 - Dams & water management/useRestricted - smallSerious or 31-70% pop. declineHigh (continuing)

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Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (8)
California (4)
AreaForestAcres
Chips CreekPlumas National Forest12,940
Chips CreekLassen National Forest29,089
KellySix Rivers National Forest5,195
Orleans Mtn. BSix Rivers National Forest17,183
Washington (4)
AreaForestAcres
ManastashWenatchee National Forest11,155
Norse PeakWenatchee National Forest10,169
QuartzWenatchee National Forest8,550
TaneumWenatchee National Forest26,140
References (9)
  1. CCH2 Portal. 2023. Consortium of California Herbaria. Online. Available: https//:www.cch2.org/portal/index.php (accessed 2023).
  2. Flora of North America Editorial Committee (FNA). 2006b. Flora of North America north of Mexico. Vol. 20. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford Univ. Press, New York. xxii + 666 pp.
  3. Global Biodiversity Information Facility (GBIF). 2023. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2023).
  4. iNaturalist. 2023. Online. Available: https://www.inaturalist.org (accessed 2023).
  5. 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.
  6. NatureServe. 2023. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  7. Semple, J.C., C. Leeder, C. Leuty, and L. Gray. 1988b. <i>Heterotheca </i>sect. <i>Ammodia </i>(Compositae: Astereae): A multivariate study of <i>H. oregona</i> and specimens of Brewer's (golden) aster. Systematic Botany 13(4): 547-558.
  8. Southwest Environmental Information Network (SEINet). 2023. Collections Databases. Online. Available: https://swbiodiversity.org/seinet/collections/index.php (accessed 2023).
  9. Washington Natural Heritage Program. 2013. <i>Heterotheca oregona</i>. Accessed on September 19, 2022. https://www.dnr.wa.gov/publications/amp_nh_heor2.pdf