Washington

Tom Kaye, Institute for Applied Ecology

Golden paintbrush (Castilleja levisecta) is listed as threatened and has become regionally extinct in the southern portion of its range due to habitat conversion.  A few wild populations remain in Washington and British Columbia.  Efforts to conserve the species in Oregon have emphasized wild seed collection across multiple remnant WA populations, agricultural seed increase, plug planting and seeding into restoration sites and prairies, and follow up management (including mowing, burning, and seed addition to increase plant diversity).  Concurrent research has demonstrated that the species is a generalist hemiparasite that benefits from having multiple hosts, underscoring the need to maintain or enhance plant diversity at reintroduction sites.  In addition, field tests have helped narrow the habitat type in which the species will thrive.  Since 2010, the species has established and increased in Oregon dramatically through reintroduction on conserved public and private lands, to over 350,000 plants across 23 populations in 2018.  The US Fish and Wildlife Service is currently considering delisting the species due to these recent successes with population establishment.

Contributing Author(s): 
Date Recorded: 
Friday, May 3, 2019

Wendy Gibble, University Of Washington Botanic Gardens

Hackelia venusta (showy stickseed) is a narrow endemic plant known only from one population in central Washington. It was listed as an endangered species in 2002 when the population was estimated at 600 plants spread over 40 acres. The most recent survey in 2012 documented 477 plants. Building on previous work, Rare Care initiated a propagation program to augment the existing population and attempt to establish new populations. Experiments on seed germination improved germination rates from approximately 5 to 10% to approximately 80% by embryo excision. In fall 2015, 265 plants were outplanted to sites at the existing population and to a new site approximately 3 miles away. Survivorship was 83% by May 2016, but declined to 25% by May 2018. In this talk, we will present some insights on propagating and reintroducing this challenging species and a summary of three years of monitoring the outplantings.

Contributing Author(s): 
Date Recorded: 
Friday, May 3, 2019