Astragalus applegatei - M.E. Peck
Applegate's Milkvetch
Other Common Names: Applegate's milkvetch
Taxonomic Status: Accepted
Related ITIS Name(s): Astragalus applegatei M.E. Peck (TSN 25418)
Unique Identifier: ELEMENT_GLOBAL.2.156762
Element Code: PDFAB0F0P0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Pea Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Fabales Fabaceae Astragalus
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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: Astragalus applegatei
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 26Nov2012
Global Status Last Changed: 16Jul1984
Rounded Global Status: G1 - Critically Imperiled
Reasons: Limited range with a small number of extant populations. Threatened from fragmentation and loss of habitat, potential development and road construction, elimination of the natural seasonal flooding regime along the floodplains supporting the species, suppression of fire, invasive exotic plants, and insect usage. Two sites are threatened by rabbit grazing.
Nation: United States
National Status: N1

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 Oregon (S1)

Other Statuses

U.S. Endangered Species Act (USESA): LE: Listed endangered (28Jul1993)
U.S. Fish & Wildlife Service Lead Region: R8 - California-Nevada

NatureServe Global Conservation Status Factors

Range Extent Comments: Found only in Lower Klamath Basin, e.g., near the city of Klamath Falls, in Klamath County, Oregon. Perhaps in adjacent Siskiyou County, California ('to be sought', Barneby 1964). 135 sq m calculated by convex hull.

Area of Occupancy:  
Area of Occupancy Comments: 11 4km2 grid cells occupied with extant populations.

Number of Occurrences: 6 - 20
Number of Occurrences Comments: 7 extant populations using 1 km separation distance.

Population Size Comments: From surveys in 2000s, population is about 33,000 but this number may not be stable.

Number of Occurrences with Good Viability/Integrity: Very few (1-3)
Viability/Integrity Comments: 2 populations with good/excellent viability using 1 km separation distance.

Overall Threat Impact: Very high - high
Overall Threat Impact Comments: Habitat altered by agriculture and urban development; rabbit grazing; invasive exotic plants; insect usage; lack of flooding. Calculated as highly vulnerable to climate change.

Short-term Trend: Unknown
Short-term Trend Comments: Population counts seem to fluctuate widely.

Long-term Trend: Decline of <70% to increase of <25%
Long-term Trend Comments: Decline of 10-70%. The range of this species has been heavily impacted by habitat change due to rural development and agriculture.

Intrinsic Vulnerability Comments: Unknown.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Found only in Lower Klamath Basin, e.g., near the city of Klamath Falls, in Klamath County, Oregon. Perhaps in adjacent Siskiyou County, California ('to be sought', Barneby 1964). 135 sq m calculated by convex hull.

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 OR

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
OR Klamath (41035)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Lost (18010204)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A prostrate perennial herb with stems that are loosely clustered or spreading from a long slender taproot. Can grow into mats, 3-9 dm wide and usually 3-4 dm tall. Flowers (June to early August) are pale purple.
General Description: A low lying perennial, herbaceous plant with slender stems appearing clustered or loosely spreading from a taproot. Mature plants may grow as a circular mat with a radius of 1-3 feet (1/3 - 1 m). Flowers are pea-like, light purple, about 1/4 inch (.6 cm) long with the lower petal almost pependicular to the flower stalk. Seed pods are about 1/3-1/2 inch (.8 - 1.25 cm) long with purple mottling.
Technical Description: Stems clustered, slender, spreading or procumbent, simple or few-branched, glabrous or slightly strigose above, 2.5-4 dm high; leaves ascending, 5-8 cm long, the petiole and rachis very slender, the leaflets 9-13, rather remote, linear or linear-oblong, mucronate, truncate, or retuse at apex, 1-2 cm long, glabrous above, sparingly strigose beneath; peduncles with the raceme equaling to twice as long as the leaves, spreading, slender, the racemes sparsely flowered, 5-7 cm long, the flowers nodding; calyx campanulate, black-strigose, 3 mm long, the triangular teeth less than half as long as the tube; corolla 6-7 mm long, light lavender, the broad standard bent upward at nearly a right angle; pods horizontally spreading, 8-13 mm long exclusive of the stipe, the latter 4-5 mm, narrowly oblong, slightly compressed, abruptly pointed at apex, nearly straight, the valves thin-cartilaginous, minutely strigose, purplish-mottled (Peck 1961).
Reproduction Comments: Self-fertilization and crossing occur (4/98 Recovery Plan).
Palustrine Habitat(s): HERBACEOUS WETLAND, Riparian
Terrestrial Habitat(s): Grassland/herbaceous
Habitat Comments: Flat seasonally moist remnants of alkaline floodplain grasslands of the Klamath Basin, at about 1250 meters. The substrate is poorly drained fine silt loam (an underlying hardpan impedes drainage). Prior to irrigation and water control along the Klamath River, periodic flooding probably limited the dominance of other species and provided openings for establishment of Astragalus applegatei.
Economic Attributes
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Economically Important Genus: Y
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: 26Nov2012
NatureServe Conservation Status Factors Author: Roth, E.; rev. E. Joyal, Maybury/Vrilakas, 1996, B. MacBryde 9/2000, rev. L.K. Wise (2012)
Element Ecology & Life History Edition Date: 26Sep2000

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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  • Barneby, R.C. 1964. Atlas of North American Astragalus. 2 Vols. New York Botanical Garden, Bronx, New York. 1188 pp.

  • Isely, D. 1998. Native and naturalized Leguminosae (Fabaceae) of the United States (exclusive of Alaska and Hawaii). Monte L. Bean Life Science Museum, Brigham Young University; MLBM Press, Provo, Utah. 1007 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.

  • Parenti, R. 1993. Endangered and threatened wildlife and plants; Determination of endangered status for the plant Astragalus applegatei (Applegate's milk-vetch). Federal Register 58(143): 40547-40551.

  • Yamamoto, Susan. 1985. Status report for Astragalus applegatei. Oregon Natural Heritage Data Base, The Nature Conservancy, Portland.

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