Eucephalus vialis - Bradshaw
Wayside Aster
Synonym(s): Aster vialis (Bradshaw) Blake
Taxonomic Status: Accepted
Related ITIS Name(s): Eucephalus vialis Bradshaw (TSN 508094)
Unique Identifier: ELEMENT_GLOBAL.2.155792
Element Code: PDASTEC0A0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Eucephalus
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Concept Reference
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Concept Reference: 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.
Concept Reference Code: B99KAR01HQUS
Name Used in Concept Reference: Eucephalus vialis
Taxonomic Comments: Generally considered a distinct species, often treated as Aster vialis, but sometimes recognized instead as Eucephalus vialis (as by Kartesz, 1999).

Conservation Status
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NatureServe Status

Global Status: G3
Global Status Last Reviewed: 07Dec2004
Global Status Last Changed: 19Nov2002
Rounded Global Status: G3 - Vulnerable
Reasons: This species' range is limited to central and southern, western Oregon and the very northern border of California. There are about 100 populations known, with a total of fewer than 9000 individual plants. Many of populations are along roadsides and in areas of residential development; none are considered protected.
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 California (S1), Oregon (S3)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Found mainly in western Oregon, central and southern portions, from southern Linn County southward to the California border. Most populations are centered in the southern Willamette Valley of Lane County or in southern Jackson and Josephine Counties. There are a few populations in the adjacent counties of California.

Area of Occupancy: 6-25 4-km2 grid cells
Area of Occupancy Comments: Total occupied acres is estimated at 4500 acres.

Number of Occurrences: 21 - 300
Number of Occurrences Comments: There are 76 known occurrences in Oregon, and 1 in California. More sites may exist in the Siskiyou Mts than has been currently reported.

Population Size Comments: Total plant numbes are about 7000.

Number of Occurrences with Good Viability/Integrity: Few (4-12)
Viability/Integrity Comments: Of the 76 known Oregon occurrences, 7 have plant numbers greater than 300 with one population having over 1200 plants.

Overall Threat Impact: Low
Overall Threat Impact Comments: This species seems to tolerate slight disturbance. It is often found growing along roadsides and quite well in at least one person's backyard. However, it is vulnerable to roadside herbicide use.

Short-term Trend: Relatively Stable (<=10% change)
Short-term Trend Comments: This plant seems to tolerate slight disturbance, and may prefer open to semi-shade. Plants growing under closed canopy appear less vigorous and robust. In areas that have human disturbance, roadsides, gardens etc., populations appear to expand and will probably be shaded out.

Long-term Trend: Decline of <30% to increase of 25%

Environmental Specificity: Moderate. Generalist or community with some key requirements scarce.
Environmental Specificity Comments: This aster grows in openings and near edges of mixed forests, usually of Douglas-fir (Pseudotsuga menziesii), oak (Quercus garryana, Q. kelloggii, or Q. chrysolepis), madrone (Lithocarpus densiflora), and tanoak (Lithocarpus densiflora) in the southern populations. It also appears to be dependent on small disturbances, either natural or man-made (Gamon 1986).

Other NatureServe Conservation Status Information

Distribution
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Global Range: Found mainly in western Oregon, central and southern portions, from southern Linn County southward to the California border. Most populations are centered in the southern Willamette Valley of Lane County or in southern Jackson and Josephine Counties. There are a few populations in the adjacent counties of California.

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, OR

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Del Norte (06015), Humboldt (06023)*
OR Douglas (41019), Lane (41039), Linn (41043)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
17 Middle Fork Willamette (17090001)+, Coast Fork Willamette (17090002)+, Upper Willamette (17090003)+, Mckenzie (17090004)+, Siuslaw (17100206)+, North Umpqua (17100301)+, South Umpqua (17100302)+, Umpqua (17100303)+, Coquille (17100305)+*, Illinois (17100311)+
18 Trinity (18010211)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A perennial herb, 6-12 dm tall. Flower heads are rayless and have yellowish disk flowers. Blooms from July to early August.
General Description: A perennial, mostly 2-4 feet tall, from a stout base. The lowest leaves are small and somewhat scale-like. The leaves are largest near the middle; they get gradually smaller near and in the inflorescence. The leaves, which are attached directly to the stem without petioles, are dull green and may or may not have irregular teeth. There are several leafy flower heads, which are about 1/2 inch wide. The heads do not have ray flowers (Gamon, 1986).
Technical Description: Stem stout, 6-10 dm high, glabrous or slightly puberulent; leaves numerous, broadly lanceolate to ovate, entire, acute, sessile, slightly pubescent beneath, glabrous above, thin, veiny, 6-10 cm long; heads rather few, in a terminal leafy panicle and on small axillary branches; peduncles glandular-puberulent; involucre narrowly campanulate, 8-10 mm high, the bracts linear-lanceolate, acute, slightly ciliate, not numerous, the tips scarcely herbaceous, the outer very short; rays none; akenes thinly pubescent. (Peck, 1961)
Habitat Comments: Open woods at low elevations. Associated species include Douglas fir (Pseudotsuga menziesii), golden chinquapin (Castanopsis chrysophylla), and Pacific madrone (Arbutus menziesii).
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: 19Nov2002
NatureServe Conservation Status Factors Author: Vrilakas, Sue

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
  • Gamon, J. 1986. Status report for Aster vialis. Draft report written by Oregon Natural Heritage Data Base [Oregon Natural Heritage Information Center] for U.S. Fish and Wildlife Service. 37 pp.

  • Gamon, John G. 1986. Status Report for Aster vialis. Unpublished document on file at Oregon Natural Heritage Data Base, Portland, Oregon.

  • 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.

  • Love, R. 1986. Aster vialis, a study in cooperation. Bulletin of Native Plant Society of Oregon 19(1):8.

  • Meinke, R.J. 1982. Threatened and Endangered Vascular Plants of Oregon: An Illustrated Guide. U.S. Fish and Wildlife Service, Region 1, Portland, Oregon. 326 pp.

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