Erigeron maguirei - Cronq.
Maguire's Daisy
Other English Common Names: Maguire's Fleabane
Other Common Names: Maguire's fleabane
Taxonomic Status: Accepted
Related ITIS Name(s): Erigeron maguirei Cronquist (TSN 35898)
Unique Identifier: ELEMENT_GLOBAL.2.155795
Element Code: PDAST3M2E0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Erigeron
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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: Erigeron maguirei
Taxonomic Comments: Recognized as a species by Kartesz (1999 floristic synthesis) without recognition of varieties. Kartesz notes (pers. comm. to Larry Morse, 25Nov99) that his treatment of this species follows Cronquist in the Intermountain Flora (1974), with the concurrence of Guy Nesom. Two varieties (var. harrisonii and var. maguirei) have sometimes been recognized. The USFWS listed Erigeron maguirei var. maguirei as endangered in 1985, but subsequently (June/1996) agreed with taxonomic revision that doesn't recognize varieties and has reclassified the status to apply to the species as a whole.
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 03Jun2013
Global Status Last Changed: 26Feb1996
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: Endemic to Utah. Occurring in the San Rafael Swell (Emery County) south through Capitol Reef National Park where there are currently nine populations with over 150,000 individual plants. There are not many populations, but the species appears to be long lived with a low mortality rate and has the ability to replace individuals at a rate that compensates for mortality (USFWS 2008). Threats to the species are minimal.
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 Utah (S2)

Other Statuses

Comments on USESA: Listed as Threatened on June 19, 1996. Proposed for Delisting on May 16, 2008, for the following reasons: "Recovery efforts have identified approximately 164,250 Erigeron maguirei individuals over an estimated range of 1,010 square km (Clark et al. 2006). This represents a substantial increase from the time of listing in 1985, when the species was known from 7 individuals on BLM land limited to the upper ends of branches of Pine Canyon (49 FR 30211, July 27, 1984); and from 1996 when the species was downlisted to threatened, when taxonomic revision had increased the total population of E. maguirei to approximately 3,000 plants within 5 populations from the San Rafael Swell in Emery County to Capitol Reef in Wayne County (59 FR 46220, September 7, 1994). Current populations appear stable, threats to the species have been addressed, and adequate regulatory mechanisms ensure the species is not currently and is not likely to again become threatened or endangered in all of its range... We next addressed whether any portions of the range of Erigeron maguirei warranted further consideration. We noted that, as discussed in Factor A, there are several small geographic areas where localized mineral extraction activities remain as a potential threat in the foreseeable future. However, we concluded that these did not warrant further consideration because we believe such activities are unlikely to materialize in a meaningful way and if they do materialize, would be limited to small areas on the periphery of populations and there was no substantial information suggesting that these peripheral areas were significant portions of the range. Therefore, there is no substantial information that E. maguirei in these areas were likely to become in danger of extinction in the foreseeable future" (Federal Register 73(96): 28410-28423, May 16, 2008). As of January 19, 2011, the USFWS published the final rule removing status from Erigeron maguirei. "Our review of the status of this species shows that populations are stable, threats are addressed, and adequate regulatory mechanisms are in place so that the species is not currently, and is not likely to again become, an endangered species within the foreseeable future in all or a significant portion of its range (Federal Register 76(12): 3029-3044).
U.S. Fish & Wildlife Service Lead Region: R6 - Rocky Mountain

NatureServe Global Conservation Status Factors

Range Extent Comments: Endemic to the San Rafael Swell (Emery County) south through Capitol Reef National Park (Wayne County), Utah (USFWS 2008).

Number of Occurrences: 6 - 20
Number of Occurrences Comments: Nine populations (USFWS 2008).

Population Size Comments: Population estimated at 164, 000 individuals (USFWS 2008).

Number of Occurrences with Good Viability/Integrity: Few (4-12)
Viability/Integrity Comments: Most populations have more than 500 individuals (USFWS 2008), exceeding the number necessary for a viable population.

Overall Threat Impact: Low
Overall Threat Impact Comments: Threats to the species are minimal. Most plants occur on cliffs or domes that are not easily accessible by cattle or humans. ORVs are not permitted within the lands where the species occupies. Potential threats include uranium mining, and oil and gas drilling, but as of 2008 (USFWS), these are not threats in the foreseeable future.

Short-term Trend: Relatively Stable (<=10% change)

Other NatureServe Conservation Status Information

Distribution
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Global Range: Endemic to the San Rafael Swell (Emery County) south through Capitol Reef National Park (Wayne County), Utah (USFWS 2008).

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 UT

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
UT Emery (49015), Garfield (49017), Wayne (49055)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
14 San Rafael (14060009)+, Muddy (14070002)+, Fremont (14070003)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A hairy perennial herb, 7-25 cm tall. 1-4 flower heads with pinkish-white rays and yellow disk flowers are borne on the ends of the stems. Blooms May to June.
Duration: PERENNIAL, Long-lived
Terrestrial Habitat(s): Bare rock/talus/scree, Forest - Conifer, Forest/Woodland, Shrubland/chaparral, Woodland - Conifer
Habitat Comments: Exposed mesas and steep, narrow canyons cut into Navajo Sandstone; cool, shaded, mesic sites in crevices which collect soil and organic matter and, less frequently, along canyon bottom washes. 1,600-2,170 m elevation.
Cool, mesic wash bottoms and dry, partially shaded slopes of eroded sandstone cliffs of Wingate, Chinle, and Navajo Sandstone Formations in mountain shrub, Douglas-fir, ponderosa pine, and lower limits of juniper woodland communities between 5,400 and 7,100 feet elevation (Utah Native Plant Society 2005).

Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation
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Minimum Criteria for an Occurrence: A natural occurrence of one or more plants.
Separation Barriers: EOs are separated by either: 1 kilometer or more across unsuitable habitat or altered and unsuitable areas; or 2 kilometers or more across apparently suitable habitat not known to be occupied.
Separation Distance for Unsuitable Habitat: 1 km
Separation Distance for Suitable Habitat: 2 km
Separation Justification: The rationale for this large a separation distance across suitable but apparently unoccupied habitat is that it is likely additional research will find this habitat to be occupied. It can often be assumed that apparently unconnected occurrences will eventually be found to be more closely connected. No information on mobility of pollen and propagules is available on which to base the separation distance for this species.
Date: 06Jun2002
Author: Ben Franklin
Population/Occurrence Viability
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Excellent Viability: SIZE: 500 or more individuals (based on available EOR data). CONDITION: The occurrence has an excellent likelihood of long-term viability as evidenced by the presence of multiple age classes and evidence of flowering and fruiting, indicating that the reproductive mechanisms are intact. This occurrence should be in a high-quality site with less than 1% cover of exotic plant species and/or no significant anthropogenic disturbance. LANDSCAPE CONTEXT: The occurrence is surrounded by an area that is unfragmented and includes the ecological processes needed to sustain this species.
Good Viability: SIZE: 200 to 499 individuals (based on available EOR data). CONDITION: 200 to 499 individuals (based on available EOR data). LANDSCAPE CONTEXT: The occurrence should have a good likelihood of long-term viability as evidenced by the presence of multiple age classes and evidence of flowering and fruiting, indicating that the reproductive mechanisms are intact. Anthropogenic disturbance within the occurrence is minimal. If exotic species are present, they comprise less than 10% of the total ground cover.
Fair Viability: SIZE: The surrounding landscape should contain the ecological processes needed to sustain the occurrence but may be fragmented and/or impacted by humans. CONDITION: 20 to 199 individuals (based on available EOR data). LANDSCAPE CONTEXT: The occurrence may be less productive than the above situations, but is still viable, with multiple age classes and evidence of flowering and fruiting, indicating that the reproductive mechanisms are intact. The occupied habitat is somewhat degraded (exotic plant species make up between 10-50% of the total ground cover and/or there is a moderate level of anthropogenic disturbance).
Poor Viability: SIZE: There may be significant human disturbance, but the ecological processes needed to sustain the species are still intact. CONDITION: Less than 20 individuals (based on available EOR data). LANDSCAPE CONTEXT: Little or no evidence of successful reproduction is observed (poor seedling recruitment, no flowering or fruiting observed, or poor age class distribution). Exotic plant species make up greater than 50% of the total ground cover, and/or there is a significant level of human disturbance.
Justification: SIZE: Large populations in high quality sites are presumed to contain a high degree of genetic variability, to have a low susceptibility to the effects of inbreeding depression, and to be relatively resilient. EOs not meeting "C"-rank criteria are likely to have a very high probability of inbreeding depression and extirpation due to natural stochastic processes and/or occur in degraded habitat with low long-term potential for survival. CONDITION: Large populations in high quality sites are presumed to contain a high degree of genetic variability, to have a low susceptibility to the effects of inbreeding depression, and to be relatively resilient. EOs not meeting "C"-rank criteria are likely to have a very high probability of inbreeding depression and extirpation due to natural stochastic processes and/or occur in degraded habitat with low long-term potential for survival. LANDSCAPE CONTEXT: Large populations in high quality sites are presumed to contain a high degree of genetic variability, to have a low susceptibility to the effects of inbreeding depression, and to be relatively resilient. EOs not meeting "C"-rank criteria are likely to have a very high probability of inbreeding depression and extirpation due to natural stochastic processes and/or occur in degraded habitat with low long-term potential for survival.
Key for Ranking Species Element Occurrences Using the Generic Approach (2008).
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: 29Nov2012
NatureServe Conservation Status Factors Author: Niese, J. (1988), rev. Franklin/Maybury (1996), rev. A. Treher (2012)

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
Help
  • Cronquist, A. 1994. Asterales. In A. Cronquist, A.H. Holmgren, N.H. Holmgren, J.L. Reveal, and P.K. Holmgren. Intermountain flora: Vascular plants of the Intermountain West, U.S.A. Vol. 5. New York Botanical Garden, Bronx. 496 pp.

  • Fish and Wildlife Service. 1996. Endangered and Threatened Wildlife and Plants; Reclassification of Erigeon maguirei (Maguire daisy) From Endangered to Threatened. (50 CFR 17 & 17.12). Federal Register. 5 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.

  • U.S. Fish and Wildlife Service (USFWS). 2008. Endangered and Threatened Wildlife and Plants; Proposed Removal of Erigeron maguirei From the Federal List of Endangered and Threatened Plants; Availability of Post-Delisting Monitoring Plan. Federal Register 73(96): 28410-28423. 16 May 2008.

  • U.S. Fish and Wildlife Service (USFWS). 2011. Endangered and Threatened Wildlife and Plants; Removal of Erigeron maguirei (Maguire Daisy) from the Federal List of Endangered and Threatened Plants; Availability of Final Post-Delisting Monitoring Plan. Federal Register 76(12): 3029-3044.

  • Utah Native Plant Society. 2003-2005. Utah Rare Plant Guide. Salt Lake City, UT. Online. Available: http://www.utahrareplants.org. (Accessed 2005)

  • Welsh, S.L. 1979. Illustrated manual of proposed endangered and threatened plants of Utah. Brigham Young Univ., Provo, UT. 318 pp.

  • Welsh, S.L., N.D. Atwood, S. Goodrich, and L.C. Higgins (eds.) 1993. A Utah flora. 2nd edition. Brigham Young Univ., Provo, Utah. 986 pp.

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