Packera ganderi - (T.M. Barkl. & Beauchamp) W.A. Weber & A. Love
Gander's Ragwort
Other English Common Names: Gander's Groundsel
Synonym(s): Senecio ganderi T.M. Barkl. & Beauchamp
Taxonomic Status: Accepted
Related ITIS Name(s): Packera ganderi (T.M. Barkley & R.M. Beauch.) W.A. Weber & A. Löve (TSN 565357)
Unique Identifier: ELEMENT_GLOBAL.2.151444
Element Code: PDAST8H1F0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Packera
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Concept Reference
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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.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Senecio ganderi
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 14Jun2016
Global Status Last Changed: 26Jun1984
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: Endemic to California, Packera ganderi (= Senecio ganderi) is known from thirteen extant occurrences in Riverside and San Diego Counties. Perhaps 4000 plants exist in the wild, although its potential may be greater since this is a partial fire follower. Threats include development, ORVs, and roads. Several occurrences are on public lands but the level of protection is not known. Populations on private lands are vulnerable to extirpation.
Nation: United States
National Status: N2

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States California (S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Endemic to California in Riverside and San Diego counties.

Area of Occupancy: 6-25 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 6 - 20
Number of Occurrences Comments: Fourteen occurrences.

Population Size Comments: The occurrences with plant counts add up to about 4000 plants in total.

Number of Occurrences with Good Viability/Integrity: Few (4-12)

Overall Threat Impact: High
Overall Threat Impact Comments: Habitat degradation and loss are the primary threat. Several occurrences occur on public land, however unprotected occurrences are likely to be developed. Threats include development, ORVs, erosion, trampling, agriculture, roads and trails, and trampling.

Short-term Trend: Decline of 10-30%
Short-term Trend Comments: One occurrence is extirpated and one has poor viability.

Long-term Trend: Decline of 30-70%
Long-term Trend Comments: Long term trend is assumed to be declining due to massive land use changes within its southern California range including development. However, several occurrences are on USFS and other public lands.

Intrinsic Vulnerability Comments: Since this plant may follow fires and fire suppression is the rule of the day, it is intrinsically vulnerable to accidental destruction when not visible.

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: Occurs in gabbro outcrops and after fires in a relatively restricted area in southern California.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Endemic to California in Riverside and San Diego counties.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Riverside (06065), San Diego (06073)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 San Luis Rey-Escondido (18070303)+, San Diego (18070304)+, Cottonwood-Tijuana (18070305)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Perennial herb to 8dm high, usualy glabrous but with a few dispersed hairs among the heads. Leaves usually suffused with purple. Stems singular from a slender rootstock, suberect to weakly ascending, with a basal rosette of leaves. Petioles of the basal leaves 1.5-2x longer than the blades, sometimes lobed. Leaf blade diverging from the vertical petiole by slight angle, somewhat succulent or coriaceous, ovate-deltoid to suborbiculate, 4-6cm long and wide; blade truncate or cordate at base with dentate margins. Cauline leaves decreasing upwards. Inflorescence with 1-9 heads. External bracts calyculate, inconspicuous or none. Main pyhyllaries about 21, sometimes 13. Rays 13+, orange. Disk flowers fewer than 40. Fruit glabrous.
Terrestrial Habitat(s): Barrens, Shrubland/chaparral
Habitat Comments: On burned areas and occasionally on gabbroic outcrops within Chapparal communities. 400 - 1200 m.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 14Jun2016
NatureServe Conservation Status Factors Author: D. Gries (1997), rev. M. Fellows (2003), R. Bittman (2005), rev. Treher and Bittman (2016)

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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  • Beauchamp, R.M. 1986. A flora of San Diego County, California. Sweetwater River Press, California. 241 pp.

  • 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)

  • 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.

  • Flora of North America Editorial Committee. 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.

  • Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.

  • 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.

  • 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.

  • Skinner, M.W., and B.M. Pavlik, eds. 1997 (1994). Inventory of rare and endangered vascular plants of California. 1997 Electronic Inventory Update of 1994 5th edition, California Native Plant Society, Special Publication No. 1, Sacramento.

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