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hairy rockcress

Scientific Name: Arabis hirsuta var. hirsuta

Family: Brassicaceae

Category: Dicot

Growth: Forb/herb

Duration: Biennial, Perennial

Other Names:

       

Hairy Rockcress (Arabis hirsuta)

Arabis hirsuta, commonly known as Hairy Rockcress, is a flowering plant belonging to the mustard family. Other common names include Mountain Rockcress and Creamflower Rockcress.

Considerations for Pets

  • This plant has hairy leaves and stems.
  • The plant produces longish seed pods.

Taxonomy and Nomenclature

  • Scientific Name: Arabis hirsuta (L.) Scop.
  • Family: Brassicaceae (also known as Cruciferae or Mustard Family)
  • Synonyms:
    • Arabis eschscholtziana
    • Arabis pycnocarpa
    • Turritis hirsuta
  • Subspecies: var. glabrata

Distribution and Habitat

  • Native to Europe, Asia, and North America.
  • Often found on limestone, chalky grassland, and walls.
  • Specific locations mentioned include:
    • Minnesota
    • Southeastern Oregon (Steens Mt. Loop Rd)
    • The Burren
    • Columbia River Gorge
    • Anchorage, Alaska
    • Pigeon Creek Park, Ottawa County, Michigan, USA

Morphological Characteristics

  • Usually a short-lived perennial, typically reaching about 60 cm (approximately 2 feet) in height.
  • Hairy leaves, primarily on the lower half of the stem, pointing upwards.
  • Erect growth habit, covered with coarse hairs.
  • Basal rosette of hairy, oblong leaves.
  • Basal leaves with short petioles, oblong to egg-shaped, 1-3 inches long, entire to sharply toothed, with rounded tips.
  • Clusters of 1/8 to 1/4 inch white flowers with 4 petals at the top of the plant.
  • Produces many longish seed pods on the upper half of the stem, close to the stem.

Additional Information

  • Flowering period is primarily in June and July (May-August).
  • Linnaeus described hairy rock cress for science in 1772.

Resources and Further Information

  • USDA PLANTS Database (Symbol: ARHI)
  • K.U.Leuven Campus Kortrijk Plant Guide
  • MountainNature.com - the Field Guide for the next Millennium
  • Discover Life
  • APHOTOFLORA - Photographic Stock Library