The Native Plant Society of Oregon is a nonprofit organization promoting the study, conservation and education about native plants in our state. Umpqua Chapter is one of 13 chapters in Oregon and is based in Roseburg. We are committed to the conservation of the unique plants of the Umpqua Valley as well as the beautiful plants of our region.


The Unique Plants of the Umpqua Valley:

  • Calochortus coxii

    Calochortus coxii or Cox's Mariposa Lily is a serpentine endemic occuring in only 8 known locations in the southern Umpqua Valley around Myrtle Creek and Riddle. Named for Marvin Cox a past member of the Umpqua Valley Chapter of the NPSO.

  • Calochortus umpquaensis

    Calochortus umpquaensis or Umpqua Mariposa Lily is a serpentine endemic found growing in dry serpentine meadows in the little river area in eastern Douglas County.

  • Arabis koehleri var koehleri

    Arabis koehleri var koehleri or Koehler's Rock Cress is unique to the Roseburg and Winchester area on rocky outcrops.

  • Plagiobothrys hirtus

    Plagiobothrys hirtus or Rough Popcorn Flower is unique to the Sutherlin area in vernal ponds.

  • Eriogonum villosissimum

    Eriogonum villosissimum or Acker Rock Buckwheat is unique to Acker Rock growing solely on quartz rock

  • Kalmiopsis fragrans

    Kalmiopsis fragrans or Fragrant Kalmiopsis is unique to the Umpqua Valley and is one of only two species in the genus Kalmiopsis. The other species in the genus Kalmiopsis leachiana is endemic to the Siskiyou Mountains just south of Douglas County.