Osterhout milkvetch (Astragalus osterhoutii)
Where Listed: WHEREVER FOUND
The Kremmling Osterhout milkvetch (also known as Osterhout milkvetch) is a non-woody (herbaceous) plant species in the pea family (Fabaceae). It has many slender and erect stems that grow to, on average, 12 to 40 inches tall. Its leaves are made up of many narrow leaflets– each up to 1 1/2 inches long. In summer, the Kremmling Osterhout milkvetch’s creamy white flowers bloom, hanging along the end of each flowering stalk. In fall, its long, green fruits often turn maroon red when mature. Though distinctive, the Kremmling Osterhout milkvetch may be confused with other milkvetch species in the area. The Kremmling Osterhout milkvetch was first collected by George Osterhout, a Colorado botanist, in 1905. The species is known only to a 15 mile range near the town of Kremmling in Middle Park of northern Colorado, a high elevation sagebrush valley surrounded by ranges of the Rocky Mountains. The Kremmling Osterhout milkvetch grows in five scattered populations on barren shale soils. These soils are rich in selenium, which the Kremmling Osterhout milkvetch concentrates in its tissues— giving the plants a distinctive garlic-like odor. The Kremmling Osterhout milkvetch is threatened by off-highway vehicle (OHV) recreation, road and utility construction and maintenance, mining, oil and gas exploration, concentrated livestock use, land development, and other land uses occurring within the species habitat. Some plants were lost when Wolford Dam was constructed. Additional threats include climate change and nonnative invasive plants (weeds). Due to its limited range and few numbers, its vulnerability to habitat modification and loss is high. Therefore, protection of existing populations is vital to the survival of the species.
- States/US Territories in which the Osterhout milkvetch is known to or is believed to occur: Colorado
- US Counties in which the Osterhout milkvetch is known to or is believed to occur: View All
- Additional species information
|Status||Date Listed||Lead Region||Where Listed|
|07/13/1989||Mountain-Prairie Region (Region 6)|
» Federal Register Documents
|07/13/1989||54 FR 29658 29663||ETWP; Final Rule to Determine Astragalus osterhoustii and Penstemon penlandii to be Endangered Species; 54 FR 29658 29663|
|05/06/2014||79 FR 25883||Endangered and Threatened Wildlife and Plants; Initiation of 5-Year Status Reviews of Nine Species in the Mountain-Prairie Region|
|05/27/2016||81 FR 33698 33700||ETWP; Initiation of 5-Year Status Reviews of 21 Species in the Mountain-Prairie Region|
|07/05/1988||53 FR 25181 25185||Proposal to Determine Astragalus osterhoutii & Penstemon penlandii to be End. Species; 53 FR 25181-25185|
|Date||Title||Plan Action Status||Plan Status|
|09/30/1992||Osterhout Milk-vetch/Penland Beardtongue (2 spp.)||View Implementation Progress||Final|
|Date||Citation Page||Title||Document Type|
|05/27/2016||81 FR 33698 33700||ETWP; Initiation of 5-Year Status Reviews of 21 Species in the Mountain-Prairie Region||
|05/06/2014||79 FR 25883||Endangered and Threatened Wildlife and Plants; Initiation of 5-Year Status Reviews of Nine Species in the Mountain-Prairie Region||
» Critical Habitat
No critical habitat rules have been published for the Osterhout milkvetch.
» Conservation Plans
No conservation plans have been created for Osterhout milkvetch.
» Life History
No Life History information has been entered into this system for this species.
» Other Resources
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