CPC Plant Profile: Henderson's Horkelia
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Plant Profile

Henderson's Horkelia (Horkelia hendersonii)

Photo Credit: Kris Freitag
Description
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Rosaceae
  • State: CA, OR
  • Nature Serve ID: 159335
  • Date Inducted in National Collection:

Participating Institutions
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Updates
Kris Freitag
  • 12/29/2021
  • Seed Collection

As part of CPC's IMLS funded initiative to determine seed storage longevity in wild rare plant species, “fresh” seed of Henderson’s horkelia (Horkelia hendersonii) was collected in the Rogue River–Siskiyou National Forest. In Oregon, it is found only at four sites in Jackson County. Thousands of the plants grow in this high-elevation, open area of low grasses and forbs; apparently, population numbers have not much changed since the “original” seed collection was made over 30 years ago. When time came to collect seed, it took a while to visually determine which of the fruits contained mature seed, which are dark, mottled and shiny as if varnished. Upon processing of the seed, it became apparent that many mature-looking seeds had no contents, which complicated selection of sufficient good seed for the project.

Center for Plant Conservation
  • 08/18/2021
  • Orthodox Seed Banking

In 2021, CPC contracted the Rae Selling Berry Seed Bank to recollect seed from a population currently held in long term orthodox seed storage as part of an IMLS-funded seed longevity experiment. The National Laboratory for Genetic Resources Preservation will evaluate how germination tested viability and RNA Integrity of seed lots decline over time in storage.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Horkelia hendersonii in orthodox seed collection. We are uncertain as to how many total seeds are in this collection.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, Rae Selling Berry Seed Bank & Plant Conservation Program holds 1 accessions of Horkelia hendersonii in orthodox seed collection. There are as many as 110 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, Rae Selling Berry Seed Bank & Plant Conservation Program has collected 1 seed accessions of Horkelia hendersonii from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, California Native Plant Society has collected 1 seed accessions of Horkelia hendersonii from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants

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Photos
Nomenclature
Taxon Horkelia hendersonii
Authority T.J. Howell
Family Rosaceae
CPC Number 2270
ITIS 25203
USDA HOHE2
Common Names Henderson's Horkelia
Associated Scientific Names Horkelia hendersonii | Potentilla hendersonii
Distribution
State Rank
State State Rank
California S1
Oregon S1S2
Habitat

Ecological Relationships

Pollinators
Common Name Name in Text Association Type Source InteractionID
Reintroduction
Lead Institution State Reintroduction Type Year of First Outplanting

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