Erigeron maniopotamicus - G. L. Nesom & T. W. Nelson
Mad River Fleabane Daisy
Taxonomic Status: Provisionally accepted
Related ITIS Name(s): Erigeron maniopotamicus G.L. Nesom & T.W. Nelson (TSN 780315)
Unique Identifier: ELEMENT_GLOBAL.2.770665
Element Code: PDASTE1050
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: Nesom, G. L., and T. W. Nelson. 2004. A new species of Erigeron (Asteraceae: Astereae) from northwestern California. Sida 21(2):673-678.
Concept Reference Code: A04NES02HQUS
Name Used in Concept Reference: Erigeron maniopotamicus
Conservation Status
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NatureServe Status

Global Status: G2?
Global Status Last Reviewed: 26Dec2017
Global Status Last Changed: 26Dec2017
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: Erigeron maniopotamicus is known from two counties in California on barrens where few other plant species occur. Only 8 occurrences in three general locations are known. This species does have some potential threats including cattle grazing, road maintenance, and timber harvesting activities.
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: Erigeron maniopotamicus is known from California only in Humbolt and nearby Trinity Counties.

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

Number of Occurrences: 6 - 20

Population Size Comments: Occurrences from two of the general sites were reviewed in 2004 and each occurrence had fewer than 200 individuals (CNPD, CNDDB).

Number of Occurrences with Good Viability/Integrity: Very few (1-3)

Overall Threat Impact: High - medium
Overall Threat Impact Comments: This species is potentially threatened by road maintenance, grazing and logging. Additional threats related to timber harvest activities also exist including road widening, creation of landing in potential or occupied habitat and hauling and depositing fill material, litter, waste, other debris deposition, and fuel/herbicide missing and dispensing.

Short-term Trend Comments: At least one of the few occurrences of this species has been impacted by threats in the 20th century (CNPS, CNDDB), however, it is hard to know if these threats have caused a decline of more than 10%.

Long-term Trend: Decline of 30-50%
Long-term Trend Comments: At least one of the occurrences of this species has changed significantly since it was discovered. One occurrence was discovered in the late 1800s, is on land that is privately owned and has seen significant change over the 20th century due to ranching, cattle grazing, and timber extraction (CNPS, CNDDB).

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: This species is a narrow endemic known from only a few places in California around the Mad River (Nesom and Nelson 2004).

Other NatureServe Conservation Status Information

Distribution
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Global Range: Erigeron maniopotamicus is known from California only in Humbolt and nearby Trinity 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 Humboldt (06023), Trinity (06105)*
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Mad-Redwood (18010102)+, Lower Eel (18010105)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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General Description: Erigeron maniopotamicus is a perennial species with a taproot with cuadex usually simple and usually less than 20cm. Leaves are both basal and cauline with basal leaves persisting through anthesis. The leaves are oblanceolate to spatulate-oblanceolate and 3-10 cm. Leaves are strongly to weakley 3-nerved. Ray florets are 10-12mm long and laminae are white to pinkish or purplish. Disc florets are 3.2-3.8mm long (Nesom and Nelson 2004).
Diagnostic Characteristics: E. maniopotamicus is similar to E. robustior, however, these two species do overlap in range, but are separated by habitat. The former species occurs in barrens and the latter occurs in glades and meadows and lower montane coniferous forest and sometimes in seeps and sometimes in serpentine (Nesom and Nelson 2004). Further, even though the ranges of the species overlaps E. robustior is uncommon in the portion of its range where E. maniopotamicus occurs, and specifically it occurs in loamy soilsin openings along the edges of moist fir-oak woods and hasn't been observed near areas where E. maniopotamicus occurs (Nesom and Nelson 2004).

Similarities to other species of Erigeron also exist. E. maniopotamicus is similar to E. eatonii var. plantagineus and these species occurs in close proximity to one another in the northeast corner of Siskyou Co. and Shasta Co., California. They are different in several ways but most readily in habit, including caudex, size and distribution of cauline leaves. In addition, E. maniopotamicus is similar to E. lassenianus in their leafy stems and these species approach one another in northeastern Trinity Co. and Tehama Co (Nesom and Nelson 2004). For a key of species similar to E. manipotamicus see Nesom and Nelson, 2004. SIDA 21(2): 673-678.

Reproduction Comments: This species blooms from June through August (Nesom and Nelson 2004).
Terrestrial Habitat(s): Barrens
Habitat Comments: Erigeron mainiopotamicus is known from relatively dry barrens, where few other plants occur, at elevations of 1300-1500m where it occurs on tan, rocky, non-serpentine soil that is distinct from other regional soils in the area. The barrens where this species occurs are near stunted woods with mixed conifers which are mostly composed of Douglas fir. There are serpentine soils scattered throughout the area but these soils apparently don't influence this Erigeron species (Nesom and Nelson 2004).
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: 26Dec2017
NatureServe Conservation Status Factors Author: Oliver, L. (2005), rev. Bittman and Treher, rev. Treher (2017)
Element Ecology & Life History Edition Date: 21Apr2005
Element Ecology & Life History Author(s): Oliver, L.

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
  • Nesom, G. L., and T. W. Nelson. 2004. A new species of Erigeron (Asteraceae: Astereae) from northwestern California. Sida 21(2):673-678.

  • Ward, M. and R. Bittmann. 2005. Rare Plant Status Review: Erigeron maniopotamicus. California Native Plant Society (CNPS) and California Natural Diversity Database (CNDDB).

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