Potentially threatened by road maintenance, vehicles, and recreational activities. Previously identified as S. campestris; differentiated in lacking uniformly dark purple sepals (vs. uniformly dark purple sepals), lack of dense cluster of fertile flowers at apex of inflorescence (vs. dense cluster), less than 0.5 m tall (vs. often taller than 1 m), leaves appearing thick, coriaceous (vs. leaves appearing thin), basal leaf petioles without ciliate margins (vs. often with ciliate margins), and endemic to San Bernardino Mtns. (vs. southeastern foothills of the San Bernardino Mtns. south to Baja CA, Mexico in S. campestris). See Madroño 67(1):19-34 (2020) for original description.