Amsonia jonesii
Author: Woods.

Jones blue star

Apocynaceae (Dogbane Family)

Close up of Amsonia jonesii courtesy of the National Park Service.
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Close up of Amsonia jonesii by Robert Dorn
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Ranks and Status

Global rank: G4
State rank: S2
Federal protection status: BLM Sensitive
State protection status: None

[+] Description and Phenology

Amsonia jonesii by Bobbi Angell
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General description: Flowers tubular, powder-blue; corolla with 5 lobes united at the base, and with stiff inpointing hairs; leaves alternate; stems 1.5-5 dm tall, usually much branched from the base; plants with milky juice; tap rooted perennial.

Look Alikes: Not likely to be confused with other species in this habitat in Colorado.

Phenology: Flowers in late April and May (Colorado Natural Heritage Program 2012).

[+] Herbarium Photos

Images of Amsonia jonesii housed at the Colorado State University Herbarium.

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[+] Habitat

Habitat of Amsonia jonesii by Tim and Ann Henson
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Habitat of Amsonia jonesii courtesy of the National Park Service.
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In dry, open areas with clay, sandy, or gravelly soils, in desert-steppe, rocky gorges and canyons. Associated species include pinyon pine, juniper, Hilaria jamesii, Forsellesia meionandra, Penstemon utahensis, Cercocarpus montanus, Purshia stansburiana, Amelanchier utahensis, Rhus trilobata, Fraxinus anomala, Artemisia tridentata ssp. tridentata, Linum lewisii, and Chrysothamnus nauseosus.

Elevation Range: 4,436 - 5,784 feet (1,352 - 1,763 meters)

[+] Distribution

Distribution of Amsonia jonesii in Colorado according to mapped land ownership/management boundaries (CNHP 2012, COMaP v9 ).
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Distribution of Amsonia jonesii in Colorado
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Colorado endemic: No
Global range: Known from the Four Corners states: Utah, New Mexico, Arizona, and Colorado (Mesa and Montezuma counties).
State range: Known from Colorado in Mesa and Montezuma counties. To be sought in Moffat County, Colorado.

[+] Threats and Management Issues

Weed invasion and off-road vehicle use are potential threats.

[+] References

    • Ackerfield, J. 2012. The Flora of Colorado. Colorado State University Herbarium. 433 pp.
    • Cronquist, A., A.H. Holmgren, N.H. Holmgren, J.L. Reveal, and P.K. Holmgren. 1984. Intermountain Flora: Vascular Plants of the Intermountain West, U.S.A. Vol. 4, Subclass Asteridae (except Asteraceae). New York Botanical Garden, Bronx. 573 pp.
    • Harrington, H.D. 1954. Manual of the plants of Colorado. Sage Press, Chicago. 666 pp.
    • Heil, K.D., S.L. O'Kane Jr., L.M. Reeves, and A. Clifford, 2013. Flora of the Four Corners Region, Vascular Plants of the San Juan River Drainage; Arizona, Colorado, New Mexico, and Utah. Missouri Botanical Garden Press, St. Louis, Missouri. 1098 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.
    • Lavender, A.E., M.M. Fink, S.E. Linn, D.M. Theobald. 2011. Colorado Ownership, Management, and Protection v9 Database. Colorado Natural Heritage Program and Geospatial Centroid, Colorado State University, Fort Collins, CO. (30 September).
    • Naumann, T. S. 1990. Inventory of Plant Species of Special Concern and the General Flora of Dinosaur National Monument 1987-1989. Unpublished report prepared for the National Park Service Report, Denver, CO.
    • USDA, NRCS. 2013. The PLANTS Database. National Plant Data Team, Greensboro, NC 27401-4901 USA.
    • Weber, W. A. and R. C. Wittmann. 2012. Colorado Flora, Western Slope, A Field Guide to the Vascular Plants, Fourth Edition. Boulder, Colorado. 532 pp.
    • Welsh, S.L., N.D. Atwood, L.C. Higgins, and S. Goodrich, eds. 1987. A Utah Flora. Great Basin Naturalist Memoir 9, Brigham Young University, Provo, Utah. 894 pp.

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