Basalt Desert Buckwheat / Center For Plant Conservation
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Plant Profile

Basalt Desert Buckwheat (Eriogonum codium)

Eriogonum codium flowering in situ in Washington.

 Photo Credit: Jesse E. D. Miller
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: Federally Threatened
  • Family: Polygonaceae
  • State: WA
  • Nature Serve ID: 134283
  • Lifeform: Forb/herb
  • Date Inducted in National Collection:
Description:

An ironic legacy of the Cold War is that some of the best remaining habitats for many native and endangered species are on military bases or other government properties. Artillery ranges, training grounds, and secure land surrounding bases, ammunition depots and other top-secret or dangerous areas have been closed to the public, and thus closed to development and grazing. The Hanford Nuclear Reactor in south-central Washington was built during World War II to produce and prepare the plutonium for the United States' first atomic bomb. The land surrounding the reactor was set aside as a security and safety buffer. Although the nuclear reactor has been decommissioned, the land surrounding the reactor has remained closed to the development and grazing. The site that was once dedicated to producing plutonium, one of the most toxic substances known, has proved to be a blessing for native flora and fauna. Now, the Department of Energy's Hanford Nuclear Reservation, which straddles the Columbia River, contains some of the largest remnant areas of ungrazed and undeveloped shrub steppe in the Pacific Northwest. In 1994, The Nature Conservancy of Washington and the U.S. Department of Energy began the Hanford Biodiversity Project. The property was searched by scientists and a full inventory of plants, animals, and insects was compiled. Searches of this land revealed 30 rare plant taxa, three of which were new to science, including Eriogonum codium and Lesquerella tuplashensis (see profile on this web-site). The only known population of Eriogonum codium occupies a narrow band that is 1.5 miles (2.5 km) long by less than 100 ft (30 m) wide. The plants occur on exposed basalt above steep cliffs and slopes, and are subjected to strong winds and a harsh environment (Reveal et al. 1995).

Where is Basalt Desert Buckwheat (Eriogonum codium) located in the wild?

Habitat:

Eriogonum codium grows only on a particular pumice-like substrate associated with a basalt flow along the ridge crest at 1100-1300 feet (340-400 m). It is found growing with Grayia spinosa, Salvia dorrii, Phacelia linearis, Cryptantha pterocarya, Camissonia minor, and Bromus tectorum

Distribution:

WA: Columbia Basin

States & Provinces:

Basalt Desert Buckwheat can historically be found in Washington

Which CPC Partners conserve Basalt Desert Buckwheat (Eriogonum codium)?

  • University Of Washington Botanic Gardens

    Not Sponsored
    Assigned 06/09/17

  • Rae Selling Berry Seed Bank & Plant Conservation Program

    Not Sponsored
    Conservation Actions
    Assigned 08/06/19
    • CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

    Conservation Actions

    • 09/09/2020
      • Propagation Research

    Germination trials were conducted at The Berry Botanic Garden. Seeds were either cold stratified for 8 weeks or not cold stratified. The seeds were then subjected to either constant 68F (20C) or alternating 50/68F (10/20C). The highest germination percentage (86%) was achieved by cold stratification followed by alternating temperatures. Cold stratification followed by constant temperatures yielded 67% germination. Direct placement in constant temperatures yielded 50% germination while direct placement in alternating temperatures yielded only 17% germination (BBG File).

    • 09/09/2020
      • Demographic Research

    In a demographic study from 1997-1999, permanent plots were established to track the fates of adults and seedlings in the wild. A total of 97 adults were tagged and their fates were followed for three years. The mean adult mortality between 1997 and 1999 was 2% annually. Of the 161 new seedlings that emerged during the study, almost all died during their year of germination and none survived more than a year. Flower production was generally abundant, but highly variable between individuals and years. Limited observation suggested that approximately 10% of the flowers set seed (Dunwiddie et al. 2001).

    Nature Serve Biotics
    • 05/02/2017

    Endemic to a narrow, discontinuous, 1.6 km-long ridgeline in southeastern Washington State. The population consists of about 5,000 individuals. Fire is a potential threat; the species does not appear to be fire adapted and the possibility (and intensity) of fire at this site is increasing due to cheat grass invation. A human-caused fire destroyed 10 to 20 percent of the population in 1996. Other potential threats include ORV use. The individual plants are long-persisting, and rarely reproduce from seed.

    Edward Guerrant, Ph.D.
    • 01/01/2010

    Off-Road-Vehicle (ORV) use and livestock grazing could threaten any plants found outside of the Nuclear Reserve (WNHP 1999). Fire (WNHP 1999). A 1996 fire killed approximately 20% of the adult plants in the population. The non-native, invasive gras

    Edward Guerrant, Ph.D.
    • 01/01/2010

    As of 1997: 1 site with approximately 5000 adult plants, covering nearly 0.6 ha (Reveal et al. 1997).

    Edward Guerrant, Ph.D.
    • 01/01/2010

    In a demographic study from 1997-1999, permanent plots were established to track the fates of adults and seedlings in the wild. A total of 97 adults were tagged and their fates were followed for three years. The mean adult mortality between 1997 and 1999 was 2% annually. Of the 161 new seedlings that emerged during the study, almost all died during their year of germination and none survived more than a year. Flower production was generally abundant, but highly variable between individuals and years. Limited observation suggested that approximately 10% of the flowers set seed (Dunwiddie et al. 2001). Germination trials were conducted at The Berry Botanic Garden. Seeds were either cold stratified for 8 weeks or not cold stratified. The seeds were then subjected to either constant 68F (20C) or alternating 50/68F (10/20C). The highest germination percentage (86%) was achieved by cold stratification followed by alternating temperatures. Cold stratification followed by constant temperatures yielded 67% germination. Direct placement in constant temperatures yielded 50% germination while direct placement in alternating temperatures yielded only 17% germination (BBG File).

    Edward Guerrant, Ph.D.
    • 01/01/2010

    Most of the Hanford Nuclear Site is now the Hanford National Monument. The Hanford Nuclear Site, which lies astride the Columbia River in south-central Washington, contains some of the largest remnant areas of ungrazed and undeveloped shrub steppe in the Pacific Northwest. It is largely protected from public access and livestock grazing is not permitted. Candidate for Federal Listing.

    Edward Guerrant, Ph.D.
    • 01/01/2010

    Annual, long-term monitoring for examination of population trends. Highest consideration should be the tracking of seedling recruitment, as there appears to be a gap in recruitment. It needs to be determined if regeneration has been impaired for a long period of time, or if the lack of seedling recruitment is part of a natural pattern of population dynamics (Dunwiddie et al. 2001).

    Edward Guerrant, Ph.D.
    • 01/01/2010

    Collect and store seeds from throughout the population. Determine optimum germination requirements. Determine propagation and reintroduction protocols.

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    Nomenclature
    Taxon Eriogonum codium
    Authority Reveal, Caplow, & K. Beck
    Family Polygonaceae
    CPC Number 15822
    ITIS 565176
    USDA ERCO43
    Duration Perennial
    Common Names basalt desert buckwheat | Umtanum desert buckwheat
    Associated Scientific Names Eriogonum codium
    Distribution WA: Columbia Basin
    State Rank
    State State Rank
    Washington S1
    Ecological Relationships

    Photos

    Eriogonum codium provides a splash of color in an otherwise brown landscape. Photo Credit: Florence Caplow

    Eriogonum codium is one of few plants found in this rocky soil. Photo Credit: Katy Beck

    Eriogonum codium flowering in situ in Washington.

    Photo Credit: Jesse E. D. Miller

    Closeup of Eriogonum codium flowering in situ in Washington.

    Photo Credit: Walter Fertig

    Umtanum Desert buckwheat flowering in situ in Washington.

    Photo Credit: Tara Callaway USFWS

    Closeup of Umtanum Desert buckwheat flowering in situ in Washington.

    Photo Credit: Tara Callaway USFWS
    Videos
    How Soil Influences the Rarity and Evolution of Wild Rare Buckwheats
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