Home/Species/ Oregon Bolandra

Bolandra oregana

S. Wats.

Oregon Bolandra

G3Vulnerable Found in 6 roadless areas NatureServe Explorer →

G3VulnerableGlobal Rank

Medium - lowThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.151031

Element CodePDSAX03020

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single nation

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderRosales

FamilySaxifragaceae

GenusBolandra

Concept Reference

Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

Conservation Status

Rank Method Rank calculation - Biotics v2

Review Date2024-11-01

Change Date1996-01-24

Edition Date2024-11-01

Edition Authorsrev. S. Vrilakas (2006), rev. Johnson, J. (2024)

Threat ImpactMedium - low

Range Extent20,000-200,000 square km (about 8000-80,000 square miles)

Number of Occurrences21 - 80

Rank Reasons

Bolandra oregana is a perennial herb known from 50 occurrences along the Columbia River Gorge and the Snake and Salmon Rivers and their tributaries in Oregon, Washington, and Idaho, United States. The habitat has few threats other than climate change and large fires.

Range Extent Comments

Bolandra oregana is native to the Columbia River Gorge in northwest Oregon and southwest Washington, and the Snake and Salmon Rivers and their tributaries in Oregon, Washington, and Idaho. Range extent was estimated using herbarium specimens, photo-based observations, and NatureServe Network occurrence data collected between 1993 and 2024 (GBIF 2024, iNaturalist 2024, NatureServe 2024, CPNWH 2024, OSU 2024).

Occurrences Comments

By applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1993 and 2024, it is estimated that there are 50 occurrences rangewide (GBIF 2024, iNaturalist 2024, NatureServe 2024, CPNWH 2024, OSU 2024).

Threat Impact Comments

Bolandra oregana has few threats thanks to its steep, rocky habitat. Climate change is predicted to make much of the habitat drier and slightly warmer (Miller et. al 2023). Prolonged droughts are making large fires more likely in the Columbia Gorge (Halofsky et. al. 2022). The Eagle Creek fire in Oregon in 2017 burned about 50,000 acres on the the Oregon side of the river, including much of the Bolandra oregana habitat. The effect of the fire on the affected populations is not well documented.

Ecology & Habitat

Habitat

Bolandra oregana grows on wet, shaded, rocky crevices, mossy rocks, and cliffs, usually near waterfalls or seeps at lower elevations and open rocky or grassy areas at higher elevations (FNA 2009, Camp and Gamon 2011).

Terrestrial Habitats

Grassland/herbaceousBare rock/talus/screeCliff

Palustrine Habitats

Riparian

Other Nations (1)

United StatesN3

Province	Rank	Native
Idaho	SNR	Yes
Washington	S2	Yes
Oregon	S3	Yes

Threat Assessments

Threat	Scope	Severity	Timing
7 - Natural system modifications	Pervasive (71-100%)	Slight or 1-10% pop. decline	Moderate (short-term)
7.1 - Fire & fire suppression	Pervasive (71-100%)	Slight or 1-10% pop. decline	Moderate (short-term)
7.1.1 - Increase in fire frequency/intensity	Pervasive (71-100%)	Slight or 1-10% pop. decline	Moderate (short-term)
11 - Climate change & severe weather	Large (31-70%)	Moderate - slight	Moderate (short-term)
11.1 - Habitat shifting & alteration	Large (31-70%)	Moderate - slight	Moderate (short-term)

Plant Characteristics

DurationPERENNIAL

Economic Value (Genus)No

Roadless Areas (6)

Idaho (1)

Area	Forest	Acres
West Meadow Creek	Nez Perce-Clearwater National Forest	115,949

Oregon (4)

Area	Forest	Acres
Eagle	Mt. Hood National Forest	16,841
Imnaha Face	Wallowa-Whitman National Forest	29,575
Larch	Mt. Hood National Forest	12,961
Sheep Divide	Wallowa-Whitman National Forest	16,201

Washington (1)

Area	Forest	Acres
Bear Creek	Gifford Pinchot National Forest	7,980

References (9)

Camp, P., and J.G. Gamon, eds. 2011. Online adaptation of the Field Guide to the Rare Plants of Washington. Washington Natural Heritage Program and Washington State Department of Natural Resources. University of Washington Press, Seattle. Online. Available: https://www.dnr.wa.gov/NHPfieldguide
Consortium of Pacific Northwest Herbaria (CPNWH). 2024. Online database of vascular plant specimens from the Pacific Northwest. Online. Available: http://www.pnwherbaria.org/index.php (accessed 2024).
Flora of North America Editorial Committee (FNA). 2009. Flora of North America north of Mexico. Vol. 8. Magnoliophyta: Paeoniaceae to Ericaceae. Oxford University Press, New York. xxiv + 585 pp.
Global Biodiversity Information Facility (GBIF). 2024. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2024).
iNaturalist. 2024. Online. Available: https://www.inaturalist.org (accessed 2024).
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Oregon State University (OSU). 2024. Oregon Flora website. Oregon State University Herbarium at Oregon State University. Online. Available: https://oregonflora.org/ (accessed 2024).
Peck, M.E. 1961. A manual of the higher plants of Oregon. 2nd edition. Binsford & Mort, Portland, Oregon. 936 pp.
Washington Natural Heritage Program. 1981. An illustrated guide to the endangered, threatened and sensitive vascular plants of Washington. Washington Natural Heritage Program, Olympia. 328 pp.

Bolandra oregana

Habitat

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