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Holboell's rockcress

Scientific Name: Arabis holboellii var. pinetorum

Family: Brassicaceae

Category: Dicot

Growth: Forb/herb

Duration: Biennial, Perennial

Other Names:

       

Holboell's Rockcress

This plant profile provides information about Holboell's Rockcress, a wildflower found in various regions of North America.

Considerations for Pets

  • The plant belongs to the mustard family (Brassicaceae).
  • It produces small seeds in pods.
  • The basal leaves have toothed edges and pointed tips.

Considerations for Children

  • The plant belongs to the mustard family (Brassicaceae).
  • It produces small seeds in pods.
  • The basal leaves have toothed edges and pointed tips.

Scientific and Common Names

  • Scientific Name: Arabis holboellii Hornem.
  • Common Names: Holboell's rockcress, Holboell's Rock Cress, Holboell Rock Cress

Taxonomy and Nomenclature

  • Family: Brassicaceae (Mustard Family)
  • Genus: Arabis, Boechera (alternative classification)
  • Synonyms: The plant may be referred to as Boechera holboellii depending on the taxonomic classification used.
  • Subordinate Taxa: Varieties mentioned include Arabis holboellii var. pendulocarpa, Arabis holboellii var. pinetorum, and Arabis holboellii var. collinsii, Arabis holboellii var. retrofracta and Arabis holboellii v. holboellii.

Distribution and Habitat

  • Holboell's Rockcress is found across most of the American West and all of Canada, excluding the Maritime provinces.
  • It is also native to northern, southern, and central California.
  • Specific locations mentioned include eastern Washington (shrub-steppe habitat), Kalamalka Provincial Park near Vernon, B.C., and Nancy Creek Rd., Kettle Falls, Washington.
  • It thrives in dry, rocky areas.

Morphological Characteristics and Growth Habits

  • It is a biennial or short-lived perennial wildflower.
  • The plant features one to several erect stems, reaching up to 100 cm in height, that may be simple or branched above.
  • Basal leaves are 1/2 to 2 inches long, linear to spoon-shaped, toothed, with pointed tips, and densely hairy.
  • Stem leaves are linear.
  • It produces small pink to white flowers.
  • It is a taproot biennial that produces large amounts of small seeds in pods.

Ecological Role

  • Holboell's Rockcress is a favorite of honey bees due to its abundant white flowers and ample nectar.

Interactions with Other Organisms

  • Mentioned as a honey bee favorite.
  • In Colorado, it is known to be infected by some agent when growing near Drummond’s Rock Cress and Fendler’s rockcress.