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U.S. Forest Service

Rare Serpentine Endemic Plants of the Klamath-Siskiyou Bioregion

The Klamath-Siskiyou bioregion, the Klamath Province or Klamath-Siskiyou Ranges, is a meeting ground for species from the Cascade Range to the north, California Floristic Province species from Mexico, Sierra Nevada, and the California Coast Ranges. Many of these species find themselves at the margins of their geographic ranges in the Klamath-Siskiyou bioregion. Even the Great Basin flora has sent a finger west across the Shasta Valley, north of Mt. Shasta, into the southeastern corner of the Klamath Ranges in the Eddy and Scott Mountains, where big sagebrush (Artemisia tridentata), bluebunch wheatgrass (Pseudoregneria spicata), curlleaf mountain-mahogany (Cercocarpus ledifolius), and even greasebush (Glossopetalon spinescens) rub shoulders with serpentine endemics.

The result of this rich floristic diversity coupled with the long geologic history of the Klamath-Siskiyou Ranges, complex topography, geology, and soils, and a Mediterranean climate with a strong moisture and temperature gradient from the coast inland, is a very distinct regional flora with many rare and not-so-rare plants that are found only in the Klamath-Siskiyou bioregion. Some of these plants are restricted to serpentine, some are not.

The list of rare Klamath-Siskiyou serpentine endemics presented here includes only those plants that are confined to this bioregion. Rare plants that are shared with other regions are not shown. More common endemics (G4 or G5 ranked) are also not included, plants such as Del Norte willow (Salix delnortensis) and Brewer spruce (Picea breweriana), the latter a well known relict of the Arcto-Tertiary forest, which persists now only in the Klamath Ranges.

Photo Gallery

  • Arabis koehler var. stipitata

    Arabis koehler var. stipitata. Photo by D. Imper © CNPS.

  • Arabis macdonaldiana

    Arabis macdonaldiana. Photo by John McRae.

    Rare Plant Profile…

  • Arctostaphylos canescens ssp. sonomensis

    Arctostaphylos canescens ssp. sonomensis. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Arctostaphylos canescens ssp. sonomensis

    Arctostaphylos canescens ssp. sonomensis. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Arctostaphylos klamathensis

    Arctostaphylos klamathensis. Photo by Julie Kierstead Nelson.

  • Calochortus howellii

    Calochortus howellii. Photo by Norman Jensen, Photo·grafica botanii.

  • Calochortus howellii

    Calochortus howellii. Photo by Norman Jensen, Photo·grafica botanii.

  • Calochortus umpquaensis

    Calochortus umpquaensis. Photo by Eric Baxter.

  • Cardamine nuttallii var. gemmata

    Cardamine nuttallii var. gemmata. Photo by Norman Jensen, Photo·grafica botanii.

  • Castilleja miniata ssp. elata

    Castilleja miniata ssp. elata. Photo by Norman Jensen, Photo·grafica botanii.

  • Chaenactis suffrutescens

    Chaenactis suffrutescens. Photo by Shauna Hee.

  • Chaenactis suffrutescens

    Chaenactis suffrutescens. Photo by Shauna Hee.

  • Cypripedium californicum

    Cypripedium californicum. Photo by Br. Alfred Brousseau, College of St. Mary, California.

  • Draba carnosula

    Draba carnosula. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Epilobium siskiyouense

    Epilobium siskiyouense. Photo by Ken DeCamp.

  • Epilobium siskiyouense

    Epilobium siskiyouense. Photo by Norman Jensen, Photo·grafica botanii.

  • Ericameria ophitidis

    Ericameria ophitidis. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Eriogonum alpinum

    Eriogonum alpinum. Photo courtesy of the Shasta-Trinity National Forest.

  • Eriogonum congdonii

    Eriogonum congdonii. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Eriogonum hirtellum

    Eriogonum hirtellum. Photo by J. Knorr.

  • Eriogonum hirtellum

    Eriogonum hirtellum. Photo by J. Knorr.

  • Eriogonum hirtellum habitat

    Eriogonum hirtellum habitat. Photo by J. Knorr.

  • Eriogonum libertini

    Eriogonum libertini. Photo by Shauna Hee.

  • Eriogonum libertini

    Eriogonum libertini. Photo by Susan Erwin.

  • Erythronium citrinum var. roderickii

    Erythronium citrinum var. roderickii. Photo by John Game.

  • Galium serpenticum ssp. scotticum

    Galium serpenticum ssp. scotticum. Photo courtesy of the Shasta-Trinity National Forest.

  • Gentiana setigera

    Gentiana setigera. Photo by Norman Jensen, Photo·grafica botanii.

    Read more about G. setigera…

  • Harmonia doris-nilesiae

    Harmonia doris-nilesiae. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Harmonia doris-nilesiae

    Harmonia doris-nilesiae. Photo by Shauna Hee.

  • Hastingsia bracteosa var. atropurpurea

    Hastingsia bracteosa var. atropurpurea. Photo by Norman Jensen, Photo·grafica botanii.

  • Ivesia pickeringii

    Ivesia pickeringii. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Lomatium engelmannii

    Lomatium engelmannii. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Lomatium tracyi

    Lomatium tracyi. Photo by Br. Alfred Brousseau, College of St. Mary, California.

  • Lupinus croceum

    Lupinus croceum. Photo by Julie Kierstead Nelson.

  • Lupinus croceum

    Lupinus croceum. Photo by Julie Kierstead Nelson.

  • Lupinus lapidicola

    Lupinus lapidicola. Photo by Br. Alfred Brousseau, College of St. Mary, California.

  • Minuartia rosei close-up

    Minuartia rosei. Photo by Shauna Hee.

  • Minuartia rosei habitat

    Minuartia rosei habitat. Photo by Shauna Hee.

  • Orthocarpus pachystachyus

    Orthocarpus pachystachyus. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Penstemon filiformis

    Penstemon filiformis. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Perideridia erythrorhiza

    Perideridia erythrorhiza. Photo by Lois Shoemaker.

  • Phacelia greenei

    Phacelia greenei. Photo by Dr. Dean William Taylor, Jepson Herbarium.

  • Phacelia dalesiana

    Phacelia dalesiana. Photo by Julie Kierstead Nelson.

  • Phacelia leonis

    Phacelia leonis. Photo by Julie Kierstead Nelson.

  • Phacelia leonis

    Phacelia leonis. Photo by Susan Erwin.

  • Phlox hirsuta

    Phlox hirsuta. Photo by Norman Jensen, Photo·grafica botanii.

    Rare Plant Profile…

  • Potentilla cristae

    Potentilla cristae. Photo by John Game.

  • Raillardella pringlei

    Raillardella pringlei. Photo by Shauna Hee.

  • Raillardella pringlei

    Raillardella pringlei. Photo by Shauna Hee.

  • Raillardella pringlei

    Raillardella pringlei. Photo by Julie Kierstead Nelson.

  • Sedum moranii

    Sedum moranii. Photo by Norman Jensen, Photo·grafica botanii.

  • Sedum moranii habitat

    Sedum moranii habitat. Photo by Norman Jensen, Photo·grafica botanii.

  • Silene salmonacea

    Silene salmonacea. Photo by Susan Erwin.

  • Silene serpentinicola

    Silene serpentinicola. Photo by Norman Jensen, Photo·grafica botanii.

  • Streptanthus drepanoides

    Streptanthus drepanoides. Photo by Patrick McIntyre.

  • Tauschia howellii

    Tauschia howellii. Photo by Br. Alfred Brousseau, College of St. Mary, California.

  • Thlaspi californicum

    Thlaspi californicum. Photo by Br. Alfred Brousseau, College of St. Mary, California.

  • Viola primulifolia ssp. occidentalis

    Viola primulifolia ssp. occidentalis. Photo by Norman Jensen, Photo·grafica botanii.

Our thanks to CalPhotos and its many contributors for many of the pictures in this photo gallery.