Reports and documents by IAE staff.  

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Common ground and controversy in native plant restoration: the SOMS debate, source distance, plant selections, and a restoration- oriented definition of native

Thomas N. Kaye   2001

Propagation and planting of native plants for habitat restoration is a multi-faceted process. There are many issues over which there is general agreement among restorationists, but there are a number of subjects that cause disagreement. For example, restorationists often agree that native plants should be emphasized, but disagree over where seeds or transplants should come […]

A morphometric evaluation of Corydalis caseana and its subspecies with special attention to aquae-gelidae

Thomas N. Kaye   2001

A recently discovered population of Corydalis  at Traverse Creek, aka Saddle blanket Mtn. within the Willamette National Forest occurs in Lane County, south of the known range of cold-water corydalis and north of the known range of Sierra corydalis. Individuals in this population resemble cold-water corydalis but also appear intermediate between the two species in […]

The effect of fire on the population viability of an endangered prairie plant

Thomas N. Kaye, et al.   2001

We examined the effects of fire on population growth rate and extinction probability of a rare prairie plant. Lomatium bradshawii (Apiaceae) is an endangered species of western Oregon and Washington prairies that were frequently burned by Native Americans prior to the late 1800s. Using data from mapped plants in two populations subjected to different fall […]

Stochastic demography and conservation of an endangered perennial plant (Lomatium bradshawii) in a dynamic fire regime

Hal Caswell and Thomas N. Kaye   2001

Lomatium bradshawii is an endangered herbaceous perennial plant found in grassland and prairie remnants in western Oregon and southwestern Washington. Fire was historically in important and highly dynamic component of the environment of L. Bradshawii. Evaluating the demographic consequences of a dynamic environment requires a model for the environment and a coupling between that model and […]

Propagation and population re-establishment for tall bugbane (Cimicifuga elata) on the Salem District, BLM

Thomas N. Kaye   2001

Background: Tall bugbane is a Bureau of Land Management Special Status species that occurs in forest habitats west of the Cascade Range in British Columbia, Washington, and Oregon. To maintain the viability of this species, an interagency Conservation Strategy (Wogen et al., 1996) calls for monitoring throughout the plant’s range on USFS, BLM, and ACOE […]

Final Report: Yaquina and Alsea River Basins Estuarine Wetland Site Prioritization Project

Laura Brophy   1999

Estuarine wetlands are vitally important habitats for salmon and other species. This project, commissioned in 1998, is part of the Mid-Coast Watersheds Council’s efforts to better understand the status and conditions of the area’s natural resources and to work with interested landowners to enhance and protect important areas. This work compliments and extends the assessment […]

Propagation of endangered species: Variable germination of pink sandverbena from Pacific coast beaches

Thomas N. Kaye   1999

Pink sandverbena (Abronia umbellata ssp. breviflora) is an endangered plant of Pacific Coast beaches. Restoration efforts have focused on the development of seed germination and field propagation techniques. Germination in the laboratory was highest when seeds were removed from the fruit and received alternating temperatures (20 C/30 C) and photoperiods. Benefits from cold stratification differed strongly from […]

The role of prescribed burning in maintenance of an endangered plant species, Lomatium bradshawii

K. L. Pendergrass, et al.   1999

Responses of a federally listed endangered plant species, Lomatium bradshawii, to the use of fire as a management tool for maintaining remnant wetland prairies were evaluated at two public land areas in the Willamette Valley of western Oregon. Areas containing L. bradshawii were treated with two or three fall season prescribed burns during a nine-year […]

From flowering to dispersal: Reproductive ecology of an endemic plant, Astragalus australis var. olympicus (Fabaceae)

Thomas N. Kaye   1999

Astragalus australis var. olympicus is an endemic plant of the Olympic Mountains, Washington. It is considered a Species of Concern by the U.S. Fish and Wildlife Service. This study focused on the reproductive biology of the plant from flower production through seed germination to identify possible weak points that might contribute to its rarity and […]

Population trends of Lomatium bradshawii before and after prairie fires: 1988- 1997

Thomas N. Kaye   1998

A USFWS recovery plan for L. bradshawii (Parenti et al. 1993) targets population monitoring and enhancement as two actions needed to meet recovery objectives for the species. Population monitoring alone will not contribute to the species’ recovery unless it is combined with rigorous analysis to identify populations at risk and evaluate enhancement techniques. The goal […]

Seed dormancy in high elevation plants: implications for ecology and restoration

Thomas N. Kaye   1997

Seed germination is a crucial event in the life of every sexually reproduced higher plant. A portion of the seeds of many species are dormant; they do not germinate unless specific environmental signals or events occur. The objective of this research was to determine the extent of seed dormancy in 28 species of grasses and […]

Patterns of rarity in the Oregon flora: implications for conservation and management

Thomas N. Kaye, et al.   1997

Threatened and endangered species are a significant component of Oregon’s flora, comprising 0.2% to over 15% of the state’s plant taxa, depending on one’s definition of endangerment. With such a potentially large group of plants to conserve, generalizations regarding types of rarity and threats to these species would help improve our basic understanding and management […]

Population biology of Lomatium bradshawii II. Insect interactions, phenology, and breeding systems

Thomas N. Kaye and Melissa Kirkland   1994

Lomatium bradshawii (Bradshaw’s lomatium) is a state and federally listed endangered species that occurs in fragmented native-prairie habitat in western Oregon and southwestern Washington. A U.S. Fish and Wildlife Service recovery plan for the species identifies breeding- system and pollinator-availability research as needed for filling information gaps that could influence recovery efforts. We conducted field […]

Timber harvest and Cypripedium montanum: Results of a long-term study on the Medford District BLM


This report summarizes results from a long-term study of mountain lady’s slipper (Cypripedium montanum) on the Medford District, Bureau of Land Management (BLM). This orchid is currently a Survey and Manage vascular plant species with the BLM and the U.S. Forest Service. Populations of this orchid were monitored from 1984 through 1998 in the Foots […]

Horse Rock Ridge Assessment, Seed Collection, and Restoration

Denise E. L. Johnson  

This report describes actions taken in 2012 and 2013 as part of a multi-year project at Horse Rock Ridge Area of Critical Environmental Concern/Research Natural Area (ACEC/RNA).  Started in 2006, the purpose of this project is to assess the current condition of high-priority ecosystems at Horse Rock Ridge, prioritize native plant communities and invasive species […]