Hickman's Knotweed / Center For Plant Conservation
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Plant Profile

Hickman's Knotweed (Polygonum hickmanii)

Photo Credit: Tim Milliken
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: Federally Endangered
  • Family: Polygonaceae
  • State: CA
  • Nature Serve ID: 148265
  • Lifeform: Forb/herb
  • Date Inducted in National Collection:
Description:

Where is Hickman's Knotweed (Polygonum hickmanii) located in the wild?

States & Provinces:

Hickman's Knotweed can be found in California

Which CPC Partners conserve Hickman's Knotweed (Polygonum hickmanii)?

  • University of California Botanical Garden

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    Donor Acknowledgment - In the Works
    Conservation Actions
    Assigned 06/14/17
    • 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

    • 09/01/2020
      • Orthodox Seed Banking

    Based on an September 2020 extract of the California Plant Rescue Database, University of California Botanical Garden holds 10 accessions of Polygonum hickmanii in orthodox seed collection. There are as many as 1218 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

    • 08/05/2020
      • Seed Collection

    Based on an August 2020 extract of the California Plant Rescue Database, University of California Botanical Garden has collected 3 seed accessions of Polygonum hickmanii from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 6 maternal plants

    • 08/05/2020
      • Seed Collection

    Based on an August 2020 extract of the California Plant Rescue Database, University of California-Santa Cruz Arboretum & Botanic Garden has collected 7 seed accessions of Polygonum hickmanii from 3 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants

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    Nomenclature
    Taxon Polygonum hickmanii
    Authority H. Hinds & Rand. Morgan
    Family Polygonaceae
    CPC Number 15990
    ITIS 565425
    USDA POHI14
    Duration Annual
    Common Names Hickman's knotweed | Scotts Valley polygonum
    Associated Scientific Names Polygonum hickmanii
    Distribution
    State Rank
    State State Rank
    California S1
    Ecological Relationships

    Photos

    Photo Credit: Tim Milliken

    Photo Credit: Tim Milliken

    Polygonum hickmanii flowering in the UCBG nursery.

    Photo Credit: Holly Forbes
    Videos
    Seedbanking of Scotts Valley Polygonum
    Seed Amplification of Scotts Valley Polygonum

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