Astragalus osterhoutii, Osterhout milkvetch

By Sarah Dutton

May 10 2019

Astragalus osterhoutii M. E. Jones (or Osterhout milkvetch) is an herbaceous plant known only from a 15-mile range in the mountains of Grand County, Colorado. Due to its limited range, small population, and vulnerability to habitat loss, it was listed as an endangered species in 1989. Today, Osterhout milkvetch continues to be threatened by human impacts on its habitat, such as recreational off-highway vehicle use, road maintenance, land development, and mining.

A Closer Look

Digitization of NYBG Steere Herbarium specimens of the Southern Rocky Mountains of the United States and the writing of this story made possible through a National Science Foundation digitization grant (award #1701575).


Fish & Wildlife Service endangered species page:

Further info: