Machaeranthera coloradoensis - (Gray) Osterhout
Colorado Tansy-aster
Synonym(s): Xanthisma coloradoense (A. Gray) D.R. Morgan & R.L. Hartman
Taxonomic Status: Accepted
Unique Identifier: ELEMENT_GLOBAL.2.159099
Element Code: PDAST640C0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Machaeranthera
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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: Machaeranthera coloradoensis
Taxonomic Comments: Recognized as Xanthisma coloradoense, with no varieties distinguished, by Flora of North America Editorial Committee (2006).
Conservation Status
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NatureServe Status

Global Status: G3
Global Status Last Reviewed: 16Jul2010
Global Status Last Changed: 16Jul2010
Rounded Global Status: G3 - Vulnerable
Reasons: Known from approximately 40 occurrences in the Rocky Mountains of south-central Wyoming and south-central Colorado.
Nation: United States
National Status: N3

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 Colorado (S3), Wyoming (S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Regional endemic of south-central Wyoming and central and southern Colorado. Previously reported in north-central New Mexico (Turner 1987).

Area of Occupancy: 3-125 4-km2 grid cells
Area of Occupancy Comments: There are approximately 3000 occupied acres in Colorado.

Number of Occurrences: 21 - 80
Number of Occurrences Comments: Known from 31 occurrences in Colorado (5 of which are historical Colorado Natural Heritage Program 2009) and eight extant occurrences in Wyoming (not including one dubious report with no known voucher and one based on a hybrid specimen; Wyoming Natural Diversity Database 2009).

Population Size Comments: Not all occurrences provide estimates of population numbers, however, at least 12,000 individuals have been documented in the Colorado occurrences which provided data; seven of these occurrences report over 1000 individuals each.

Number of Occurrences with Good Viability/Integrity: Some (13-40)
Viability/Integrity Comments: There are 16 occurrences with an A or B rank in Colorado.

Overall Threat Impact: Medium
Overall Threat Impact Comments: The primary threat at this time is considered to be recreation/hiking (Rondeau et al. 2011). It is not known if all of the occurrences are or are not threatened by these activities. Direct or indirect negative impacts to M. coloradoensis populations or habitats by human-related activities could occur from motorized and non-motorized recreation, trail or road construction and maintenance, reservoir expansion, housing development, changes to natural disturbance regimes, domestic livestock activities, invasive species introduction, or small-scale mining. Lower elevation populations and those populations closest to roads and trails are likely at the most risk. (Beatty et al. 2004). In addition, in Wyoming it may potentially be affected by energy developments, including wind energy.

Short-term Trend: Unknown

Other NatureServe Conservation Status Information

Distribution
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Global Range: Regional endemic of south-central Wyoming and central and southern Colorado. Previously reported in north-central New Mexico (Turner 1987).

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 CO, WY

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CO Chaffee (08015), Dolores (08033), Fremont (08043), Gunnison (08051), Hinsdale (08053), La Plata (08067), Lake (08065), Park (08093), Pitkin (08097), Rio Grande (08105), Saguache (08109), San Juan (08111)
WY Albany (56001), Carbon (56007)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Upper North Platte (10180002)+, Medicine Bow (10180004)+, Little Medicine Bow (10180005)+, Upper Laramie (10180010)+, South Platte Headwaters (10190001)+
11 Arkansas Headwaters (11020001)+
13 Rio Grande headwaters (13010001)+, Alamosa-Trinchera (13010002)+
14 Roaring Fork (14010004)+, East-Taylor (14020001)+, Upper Gunnison (14020002)+*, Tomichi (14020003)+, Upper Dolores (14030002)+, Little Snake (14050003)+, Upper San Juan (14080101)+, Animas (14080104)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A perennial herb that forms leafy tufts, about 4-10 cm high. Leaves are coarsely-toothed, spoon-shaped to linear, 1-4 cm long, and densely hairy. Large, showy flower heads are borne singly on short stalks (not very high above the leaves). The flower heads have rose-colored or purple rays surrounding a yellow disk. Blooms June-September.
General Description: A perennial herb that forms leafy tufts, about 4-10 cm high. Leaves are coarsely-toothed, spoon-shaped to linear, 1-4 cm long, and densely hairy. Large, showy flower heads are borne singly on short stalks (not very high above the leaves). The flower heads have rose-colored or purple rays surrounding a yellow disk.
Terrestrial Habitat(s): Alpine, Grassland/herbaceous
Habitat Comments: Gravelly places or rock outcrops, often on sandstone or limestone, in variable habitat from dry mountain tundra in Colorado at 2600 m elevation, to intermontane basins of Wyoming at 2200 m.
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: Any naturally occurring population that is separated by a sufficient distance or barrier from a neighboring population. As a guideline, EOs are separated by either: 1 mile or more across unsuitable habitat or altered and unsuitable areas; or 2 miles or more across apparently suitable habitat not known to be occupied. 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 populations will eventually be found to be more closely connected; these are best regarded as suboccurrences. No information on mobility of pollen and propagules is available on which to base the separation distance for this species.
Date: 27Sep2000
Author: Spackman, S., and D. Anderson.
Population/Occurrence Viability
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Excellent Viability: Size: 1000 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. Depth and longevity of snowpack and exposure are likely to be highly pertinent to the persistence of occurrences of this species. Justification: 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.
Good Viability: Size: 500 or more individuals (based on available EOR data). Condition: 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. Landscape Context: the surrounding landscape should contain the ecological processes needed to sustain the occurrence but may be fragmented and/or impacted by humans.
Fair Viability: Size: 20 to 500 individuals (based on available EOR data). Condition: 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). Landscape Context: there may be significant human disturbance, but the ecological processes needed to sustain the species are still intact.
Poor Viability: Size: Less than 20 individuals (based on available EOR data). Condition: 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. Landscape context: the surrounding area is fragmented with many ecological processes no longer intact. The occurrence has a low probability of long-term persistence due to inbreeding depression, natural stochastic events, and its intrinsic vulnerability to human impacts.
Justification: Justification: 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: 14Oct2009
NatureServe Conservation Status Factors Author: NEIGHBOURS, M.L. (rev. W. Fertig/K. Maybury 6/96), rev. Spackman, S. and D. Anderson/L. Morse (2000); rev. Handwerk, J. and B. Heidel (2009)
Element Ecology & Life History Edition Date: 16Apr2009
Element Ecology & Life History Author(s): Handwerk, J.

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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