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Fremont County rockcress

Scientific Name: Arabis pusilla

Family: Brassicaceae

Category: Dicot

Growth: Forb/herb

Duration: Perennial

Other Names:

       

Fremont County Rockcress

The Fremont County Rockcress is a rare plant found in a specific region of Wyoming. This information page compiles details about its taxonomy, distribution, and conservation status.

Common and Scientific Names

  • Common Names: Fremont County Rockcress, Small Rockcress
  • Accepted Scientific Name: Boechera pusilla (Rollins) Dorn
  • Synonym: Arabis pusilla Rollins

Taxonomy and Nomenclature

  • Family: Brassicaceae (Mustard Family)
  • Genus: Boechera (formerly Arabis)
  • Taxonomic Rank: Species
  • Note: The plant's classification has changed, with the accepted name now being Boechera pusilla. Older references may still use the name Arabis pusilla.

Distribution and Habitat

  • This plant is a state endemic, meaning it is found nowhere else in the world.
  • It is restricted to the southern Wind River Range (specifically the South Pass area) in Fremont County, Wyoming.
  • The occupied habitat is estimated to be between 6-16 acres, within a total range of approximately 160 acres.

Conservation Status

  • The Fremont County Rockcress is a candidate for listing under the Endangered Species Act.
  • The U.S. Fish and Wildlife Service has announced that the plant warrants protection (listing) but is precluded by higher priorities.

Morphological Characteristics and Growth Habits

  • It is described as a perennial herb, meaning it lives for more than two years and is non-woody.
  • It is a forb/herb, which is a non-woody plant that is not a grass.
  • The aerial part of the plant may be lost during the coldest months, with stems and leaves quickly re-emerging in spring.

Interactions with Other Organisms

  • It is found in similar regions to other plants, such as Isely milkvetch, skiff milkvetch, and boat-shaped bugseed.

Further Information

  • Discover Life: Provides information on the biology, natural history, ecology, identification, and distribution of Arabis pusilla (Fremont County rockcress).
  • Garden Guides: Offers plant information, identification information on uses and more for the Fremont County Rockcress (Pusilla).
  • Species.wikimedia.org: Contains information and potentially images of Arabis pusilla.