Sapphire Rockcress
A Montana-only rockcress survives in scattered dry mountain openings where pale flowers and narrow fruits demand closer study than a showy wildflower display.
Artwork inspired by Isabelle Johnson
Like other members of the mustard family, each flower has four petals and later produces a slender fruit. Those traits identify the family, not necessarily the species: leaf hairs, stem form, fruit orientation, genetics, and exact range may be needed to confirm Sapphire Rockcress.
The plant is known from limited west-central Montana populations, some near roads, recreation, weeds, or resource development. Search from existing routes during bloom, photograph the whole plant and habitat without stepping into a patch, and submit uncertain records to the Montana Natural Heritage Program rather than geotagging a sensitive colony publicly.
- Range
- Montana endemic
- Family
- Mustard family
- Status
- Species of Concern
Quick guide
- Opening clue
- whole-plant form and leaf arrangement
- Confirm separately
- Dry, open, often calcareous slopes and rocky openings in west-central Montana mountain ranges; context: Dry, open, often calcareous slopes and rocky openings in west-central Montana mountain ranges
Field decisions for Sapphire Rockcress
- Recognize family
- Four petals and narrow fruits indicate a rockcress.
- Document fully
- Photograph basal leaves, stem, fruit, flowers, and habitat.
- Avoid certainty
- Related Boechera often require expert review.
- Protect colonies
- Stay on route and withhold sensitive coordinates.
Good to know
A close image of Sapphire Rockcress is not automatically decisive: habitat, timing, full structure, and the alternative species considered should remain part of the record.
Notice these
- A small perennial rockcress with white four-petaled flowers, basal leaves, and narrow upright fruits; expert characters separate it from related Boechera
- Dry, open, often calcareous slopes and rocky openings in west-central Montana mountain ranges
- Overwintering rosettes resume growth after snowmelt, flower in late spring to early summer, and set narrow fruits as exposed slopes dry.