Rare plant reintroductions are a critical conservation tool for the augmentation of diminishing populations, or re-establishment of extirpated populations. Analysis of reintroduction failures suggests that a sophisticated understanding of species biology, ecology, and habitat is essential for producing self-sustaining rare plant populations. This study sought to generate that background knowledge...
The Pacific Northwest is an internationally important region for the production of Brassica seed and other seed crops including grass seed. Oregon lawmakers mandated research into the co-existence of canola (Brassica napus) with other Brassica production in the Willamette Valley and House Bill 2427 was signed into law in 2013,...
Ecological and financial constraints limit restoration efforts, preventing the achievement of desired ecological outcomes. Harvesting invasive plant biomass for bioenergy has the potential to reduce feedback mechanisms that sustain invasion, while alleviating financial limitations. Typha × glauca is a highly productive invasive wetland plant that reduces plant diversity, alters ecological...
The Brassicaceae, Mustard Family, is a well marked natural
family, whose tetramerous flowers, tetradynamous stamens, and
distinctive bi- carpellary fruits, clearly distinguish it from related
families. It is a large family of some 3, 000 recognized species and
over 300 genera. Although numerous attempts have been made over
the past...
The California vernal pool-endemic grasses Orcuttia tenuis and Tuctoria greenei, both listed under the U.S. Endangered Species Act, were recently found in Modoc County, California, a short distance south of the Oregon border. This prompted searches in suitable habitats in adjacent portions of the Klamath Basin in Oregon, in the...
Report by Portland State University's Oregon Biodiversity Information Center (ORBIC), part of the Oregon University System's Institute for Natural Resources.
Permit specifications, construction plans, and field measurements were used to examine the correlation between design and conditions "as-built" in a population of 11 palustrine emergent marshes created in the metropolitan area of Portland, Oregon, between 1980-1986. The projects ranged from six months to almost seven years in age. Data on...
In the summers of 1998 and 1999, aquatic invertebrate and plant communities were sampled from nineteen springs in the Warner Basin of southeastern Oregon. Across the landscape, these springs exhibited a broad range in water temperature (5-24°C), pH, conductivity, elevation, and gradient. Within a particular spring, water temperature and chemistry...
Willamette Falls has long been a focus of botanical interest, but industrial development at the site has limited public access for over a century. The closure of the Blue Heron paper mill on the south bank of the river, and proposed redevelopment of the site, has given planners an opportunity...
Revised July 1989. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog