Skip to content
Center for Plant Conservation
  • Login
  • Register
  • Get Newsletters
  • Donate
  • Discover Our Work
    • 2025 National Meeting
      • Sponsor the National Meeting
      • Past National Meetings
      • 2025 Photo Contest
    • CPC Rare Plant Academy
      • Video Library
      • Photo Gallery
      • Applied Plant Conservation Course
      • Community Forum
    • National Collection
    • CPC Best Practices
      • Read Best Practices Online
      • Download Best Practices PDF
      • Purchase Best Practices Book
    • Pollinator Database
    • California Plant Rescue
    • Florida Plant Rescue
    • Rare Plant Finder
    • Seed Longevity Study
    • Rare Plant Reintroduction
      • Reintroduction Registry
      • CPC Reintroduction Database
  • Rare Plant Academy
    • Video Library
    • Photo Gallery
    • Applied Plant Conservation Course
    • Community Forum
  • Get Involved
    • Donate
    • 40th Anniversary
      • 40th Anniversary Campaign
      • 40th Anniversary Summit Event
    • Sponsor a Plant
    • Advocacy
    • Become a Partner
    • Get Newsletters
    • Register
    • Member Payments
    • Sponsor the National Meeting
  • Meet Our Community
    • CPC Newsletter
    • Conservation Partners
      • Institutional Partners
      • Individual Partners
    • CPC Star Awards
    • Fellowships
    • Community Forum
  • Support
    • Donate
    • Sponsor a Rare Plant
    • Shop CPC Merch
  • About
    • Team and Mission
    • Reports & Financials
    • Board of Trustees
    • Employment Opportunities
    • Press Room
    • Contact Us
  • Donate
  • Get Newsletters
  • Login
  • Register
National Tropical Botanical Garden

Living collections augment wild seed harvest for rare species research

Dustin Wolkis and Seana Walsh

Hawai’i has less than 1% of the land mass of the United States, yet contains almost half of the threatened and endangered plant species listed under the U.S. Endangered Species Act. In alignment with the Global Strategy for Plant Conservation, the Hawai’i Strategy for Plant Conservation, and the National Seed Strategy, we are investigating methods to preserve and protect Hawaiian species of conservation importance ex situ in the Seed Bank and Laboratory at the National Tropical Botanical Garden (NTBG). Our emphasis is determining seed, fern spore, and pollen storage behavior, longevity and aging kinetics, pathogen abatement, and seed dormancy and dormancy alleviation of native Hawaiian plant species of conservation importance.

One challenge that comes to mind around the fall harvest is collecting enough seed from our rare and imperiled species in order to conduct robust, meaningful research into seed conservation biology. One way we’ve been able to overcome this challenge for some species is by utilizing our Living Collections. For example, one of the species in the CPC National Collection in which we are tasked as being caretakers and that we are thus focusing conservation efforts, is Polyscias racemosa.

Assessed as Critically Endangered on the IUCN Red List of Threatened Species, and federally listed as endangered, the wild population of P. racemosa is down to just 110 individuals. This taxon fruits in late October and early November, exemplifying a fall harvest species. This year and last, we were able to collect P. racemosa seed from our McBryde Garden to be used in seed storage behavior and dormancy experiments as well as strengthen our ex situ banked collection. Investigations are ongoing, but this taxon was one of the first to be assessed as a candidate for cryopreservation using liquid nitrogen, which rapidly freezes marginally desiccated seed to achieve the glassy state before being transferred to a -80°C freezer.

Our Living Collection has made it possible to answer research questions for rare species. The knowledge gained from these studies will help inform seedbank protocols in order to support in situ reintroduction and conservation efforts.

Image of Shyla Villanueva and Lily Flynn, Image courtesy of National Tropical Botanical Garden
Shyla Villanueva and Lily Flynn, Image courtesy of National Tropical Botanical Garden
Picture of Polyscias racemosa
Polyscias racemosa; Shyla Villanueva and Lily Flynn. Images courtesy of National Tropical Botanical Garden

Discover Our Work

  • CPC Rare Plant Academy
  • National Collection
  • Best Practices Guide
  • Pollinator Database
  • California Plant Rescue
  • Florida Plant Rescue
  • Rare Plant Finder
  • CPC National Meeting

Get Involved

  • Donate
  • 40th Anniversary
  • Advocacy
  • Become a Partner
  • Get Newsletters
  • Register
  • Member Payment
  • Underwrite

Meet Our Community

  • CPC Newsletter
  • Institutional Partners
  • Individual Partners
  • CPC Star Awards
  • Fellowships

About

  • Team and Mission
  • Financials
  • Board of Trustees
  • Fellowships
  • Press Room
  • Contact Us

Social Media


The Center For Plant Conservation (CPC) is a 501 (c) (3) non-profit organization (EIN# 22-2527116) dedicated to saving rare plant species from extinction. CPC's National Collection represents more than 2,000 of the world's rarest plants, maintained collectively by its valued network of Participating Institutions.

Center for Plant Conservation National Headquarters 15600 San Pasqual Valley Rd. Escondido, CA 92027-7000

Email: info@saveplants.org; Phone: (760) 796-5686

The CPC National Office is headquartered at the San Diego Zoo Safari Park in Escondidio, California, in partnership with the San Diego Zoo Wildlife Alliance, a CPC Participating Institution.

San Diego Zoo Wildlife Alliance

CPC has achieved the 2019 Gold Seal of Transparency on GuideStar.

Privacy Policy | Terms & Conditions

Copyright 2020 Center for Plant Conservation | All Rights Reserved

FaceBook Twitter Instagram