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Madia radiata

Kellogg

Golden Tarweed

G3Vulnerable Found in 1 roadless area NatureServe Explorer →
G3VulnerableGlobal Rank
HighThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.146082
Element CodePDAST650E0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusMadia
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 Date2020-05-19
Change Date2020-05-19
Edition Date2020-05-19
Edition AuthorsA. Treher and R. Bittman (2012, 2018), rev. Treher (2020)
Threat ImpactHigh
Range Extent5000-20,000 square km (about 2000-8000 square miles)
Number of Occurrences21 - 80
Rank Reasons
Madia radiata is a California endemic with scattered populations in the foothills of the Inner South Coast Ranges and, locally, in the eastern San Francisco Bay area. There are 100 occurrences, but there has been a decline in this number, as some populations in the vicinity of Antioch are believed to be extirpated by urban development. Threats to Madia radiata include grazing by livestock, habitat degradation and plant mortality by road or trail maintenance and ORV use, impacts of erosion and runoff on habitat, competition for resources with non-native plant species, and the dumping of garbage that may degrade its habitat.
Range Extent Comments
Madia radiata is endemic to California (USA) and occurs in scattered populations in the foothills of the Inner South Coast Ranges and, locally, in the eastern San Francisco Bay area (FNA 2006c).
Occurrences Comments
There are 100 occurrences documented but 32 are historical and need to be surveyed for up to date information.
Threat Impact Comments
Threats to Madia radiata include grazing by livestock, road and trail maintenance, ORV use, erosion/runoff, non-native species, and the dumping of garbage. It tolerates low levels of disturbance but the extent and severity of the above threats is unknown.
Ecology & Habitat

Habitat

Madia radiata occurs in open, grassy slopes and hillsides, in friable clay soils that are calcium-rich, gypseous, and/or ultra-fine (dry bog). It is found within Valley and Foothill Grassland and Foothill/Cismontane Woodland communities at 25 to 900 meters elevation (Jepson Flora Project 2020, CNPS 2020).
Terrestrial Habitats
Forest/WoodlandWoodland - MixedShrubland/chaparralGrassland/herbaceous
Other Nations (1)
United StatesN3
ProvinceRankNative
CaliforniaS3Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentRestricted - smallUnknownUnknown
2 - Agriculture & aquacultureRestricted - smallSerious - moderateHigh (continuing)
2.3 - Livestock farming & ranchingRestricted - smallSerious - moderateHigh (continuing)
4 - Transportation & service corridorsRestricted - smallSerious - moderateHigh (continuing)
4.1 - Roads & railroadsRestricted - smallSerious - moderateHigh (continuing)
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)
8 - Invasive & other problematic species, genes & diseasesRestricted (11-30%)UnknownHigh (continuing)
8.1 - Invasive non-native/alien species/diseasesRestricted (11-30%)UnknownHigh (continuing)
9 - PollutionSmall (1-10%)Slight or 1-10% pop. declineHigh (continuing)
9.4 - Garbage & solid wasteSmall (1-10%)Slight or 1-10% pop. declineHigh (continuing)

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Plant Characteristics
DurationANNUAL
Economic Value (Genus)Yes
Roadless Areas (1)
California (1)
AreaForestAcres
Lpoor CanyonLos Padres National Forest13,762
References (10)
  1. CalFlora. 2005. Information on California plants for education, research and conservation. Berkeley, California: The CalFlora Database [web application]. Available: http://www.calflora.org/. (Accessed 2005)
  2. California Native Plant Society (CNPS). 2001. Inventory of Rare and Endangered Plants of California (sixth edition). Rare Plant Scientific Advisory Committee, David P. Tibor, Convening Editor. California Native Plant Society. Sacramento, CA. x + 388pp.
  3. California Native Plant Society (CNPS). 2020. Inventory of Rare and Endangered Plants (online edition, v8-03 0.39). California Native Plant Society, Sacramento, CA. Online. Available: http://www.rareplants.cnps.org (accessed 2020).
  4. Flora of North America Editorial Committee (FNA). 2006c. Flora of North America north of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 pp.
  5. Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
  6. Hoover, R.F. 1970. The vascular plants of San Luis Obispo County, California. Univ. California Press, Berkeley. 350 pp.
  7. Jepson Flora Project (eds.) 2020. Jepson eFlora. Online. Available: http://ucjeps.berkeley.edu/IJM.html (accessed 2020).
  8. 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.
  9. Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 pp.
  10. Twisselmann, E.C. 1967. A flora of Kern County, California. California Native Plant Society, Sacramento. 395 pp.