Astragalus osterhoutii
| Astragalus osterhoutii | |
|---|---|
| |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fabales |
| Family: | Fabaceae |
| Genus: | Astragalus |
| Species: | A. osterhoutii
|
| Binomial name | |
| Astragalus osterhoutii | |
Astragalus osterhoutii is a rare species of milkvetch known by the common name Osterhout milkvetch. It is endemic to Grand County, Colorado, where it is known from a few populations in Middle Park, a mountain basin.[1] There are five or six occurrences.[2] It is a federally listed endangered species.
The plant grows on sagebrush badlands on soils originating from the Niobrara Formation and the Pierre Shale. The gray-brown shale and siltstone clay soils are high in selenium, which the plant concentrates, causing it to develop a foul odor.[3]
This is a perennial herb producing many slender, erect, green stems up to a meter tall. The leaves are made up of several narrow linear leaflets up to 3 centimeters long. The inflorescence bears cream-colored, pealike flowers each over 2 centimeters long. The fruit is a flattened legume pod up to 4 centimeters long.
Threats to the species include flooding and reservoir creation, which have eliminated at least one occurrence.[2][3] All-terrain vehicle use and oil and gas exploration activities damage the habitat occupied by the plant.[2][3] The species was named after botanist George Everett Osterhout.
References[]
- ^ USFWS. Final rule to determine Astragalus osterhoutii and Penstemon penlandii to be endangered species. Federal Register July 13, 1989.
- ^ Jump up to: a b c The Nature Conservancy
- ^ Jump up to: a b c Center for Plant Conservation Archived December 15, 2010, at the Wayback Machine
External links[]
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- NatureServe critically imperiled species
- Astragalus
- Flora of Colorado
- Grand County, Colorado
- Astragalus stubs