Maguire daisy (Erigeron maguirei)
Erigeron maguirei is a member of the sunflower family, and is a perennial herb with a branched woody base. Its stems are decumbent (lying on the ground with the tip ascending) to sprawling or erect. Its basal leaves are spatulate shaped to oblanceolate (the shape of the leaf is longer than it is wide with the broadest portion of the leaf at the tip and narrower at the base). Its leaves and stems are covered with abundant stiff, coarse, white hairs. Its flowers are dime sized with white or pinkish-white petals. Bits of sand commonly cling to the hairs of the leaves and stems. The species is further described in our June 19, 1996, final rule reclassifying the species as threatened (61 FR 31054).
- States/US Territories in which the Maguire daisy is known to or is believed to occur: Utah
- US Counties in which the Maguire daisy is known to or is believed to occur: View All
|Status||Date Listed||Lead Region||Where Listed|
|09/05/1985||Mountain-Prairie Region (Region 6)|
» Federal Register Documents
|05/16/2008||73 FR 28410 28423||Proposed Removal of Erigeron maguirei From the Federal List of Endangered and Threatened Plants; Availability of Post-Delisting Monitoring Plan|
|06/19/1996||61 FR 31054 31058||ETWP; Reclassification of Erigeron maguirei (Maguire daisy) From Endangered to Threatened|
|04/07/2006||71 FR 17900 17902||Initiation of a 5-Year Review of Maguire Daisy, Holmgren Milk-Vetch, Shivwits Milk-Vetch, Virgin River Chub, Woundfin, and Kanab Ambersnail|
|09/05/1985||50 FR 36089 36092||Determination of End. Status for Erigeron maguirei var. maguirei (Magurie Daisy); 50 FR 36089-36092|
|01/19/2011||76 FR 3029 3044||Removal of Erigeron maguirei (Maguire Daisy) From the Federal List of Endangered and Threatened Plants; Availability of Final Post-Delisting Monitoring Plan|
|07/27/1984||49 FR 30211 30214||Proposal to Determine Erigeron maguirei var. maguirei (Maguire daisy) to be End. Species; 49 FR 30211-30214|
|Date||Title||Plan Action Status||Plan Status|
|08/15/1995||Maguire Daisy (Erigeron maguirei) Recovery Plan||View Implementation Progress||Final|
|Date||Citation Page||Title||Document Type|
|01/19/2011||76 FR 3029 3044||Removal of Erigeron maguirei (Maguire Daisy) From the Federal List of Endangered and Threatened Plants; Availability of Final Post-Delisting Monitoring Plan||
|05/16/2008||73 FR 28410 28423||Proposed Removal of Erigeron maguirei From the Federal List of Endangered and Threatened Plants; Availability of Post-Delisting Monitoring Plan||
|04/07/2006||71 FR 17900 17902||Initiation of a 5-Year Review of Maguire Daisy, Holmgren Milk-Vetch, Shivwits Milk-Vetch, Virgin River Chub, Woundfin, and Kanab Ambersnail||
|05/19/2008||Maguire Daisy 5-Year Review|
» Critical Habitat
No critical habitat rules have been published for the Maguire daisy.
» Conservation Plans
|CCA Plan Summaries|
|Central Utah Navajo Sandstone Endemics|
» Life History
Erigeron maguirei has been located from 1,585 to 2,621 meters (m) (5,200 to 8,600 feet (ft)) in elevation (Clark et al. 2006, pp. 9–11). Highest plant densities occur on mesa tops between 1,829 and 2,134 m (6,000 and 7,000 ft) in elevation (Kass 1990, p. 27; Service 1995, p. 2; Clark 2001, p. 15; Clark et al. 2006, p. 14). Erigeron maguirei has been found primarily in the Dwarf Mountain Mahogany Slickrock plant community, a community endemic to the Colorado Plateau Region (Heil 1989, p. 23; Clark 2001, pp. 15–16; Clark et al. 2006, p. 15). E. maguirei also is associated with pinyon juniper–tall shrub, ponderosa pine–tall shrub slickrock pockets, mesic canyon bottoms, mountain shrub, and intermittent riparian communities (Kass 1990, p. 22; Harper and Van Buren 1998, p. 1; Clark 2002, pp. 15–16; Clark et al. 2005, p. 7; Clark et al. 2006, p. 15). Erigeron maguirei occurs primarily on the Navajo Sandstone formation. Individuals have been located within steep, narrow, dry, rocky, and sandy canyon or wash bottoms of the Wingate, Chinle, and Navajo Sandstone formations; sandstone walls of the Wingate, Navajo, and Cutler formations; cracks of large boulders; slickrock; and atop mesas of the Navajo Sandstone formation (Cronquist 1947, p. 165; Anderson 1982, pp. 1–2; Heil 1989, pp. 25–26; Kass 1990, p. 22; Harper and Van Buren 1998, p. 1). Populations within canyon bottoms are apparently established from seeds dispersed by wind or overland flow from source populations on the mesa tops (Heil 1989, p. 25; Kass 1990, p. 27; Service 1995, p. 2). These canyon populations are generally small compared with those on the mesa tops (Heil 1989, p. 25; Kass 1990, p. 27; Service 1995, p. 2).
Flowering occurs from May to June and takes 4 to 6 weeks to go from the small green “button” bud stage to completion of anthesis, when the flower is no longer open and functional (Alston and Tepedino 2005, p. 54; Clark et al. 2006, p. 17). It appears that Erigeron maguirei lacks self compatibility, and that pollinators are necessary for cross pollination to occur (Alston and Tepedino 2005, p. 61). Because of the open nature of the flower head, E. maguirei tends to be visited by opportunistic insects searching for nectar (Alston and Tepedino 2005, p. 60). Pollinators include various flies, wasps, and bees (Alston and Tepedino 2005, p. 60).
Van Buren and Harper (2002, p. 1) collected demographic data on three Erigeron maguirei populations for a period of 9 years. The demographic data collected included plant diameter, size class, plant height, plant condition, and number of flower heads produced for individual tagged plants (Van Buren and Harper 2002, p. 2). At the Eagle Canyon study site, 124 plants were tagged in 1992 and 41 of these were still alive in 2001 (Van Buren and Harper 2002, pp. 2–3). This demographic monitoring study suggests the species is long lived, has a low mortality rate, and has the ability to replace individuals at a rate that compensates for mortality (Van Buren and Harper 2002, pp. 2–5). Overall, monitored populations appear stable (Van Buren and Harper 2002, p. 2).
» Other Resources
NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.
ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.
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