Home/Species/ Small-leaf Rockcress

Boechera cascadensis

Windham & Al-Shehbaz

Small-leaf Rockcress

G3Vulnerable Found in 1 roadless area NatureServe Explorer →

G3VulnerableGlobal Rank

MediumThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.142150

Element CodePDBRA06165

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicoccurs (regularly, as a native taxon) in multiple nations

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderCapparales

FamilyBrassicaceae

GenusBoechera

Synonyms

Arabis microphylla var. thompsoniiRollins

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.

Taxonomic Comments

Accepted as Boechera cascadensis by Al-Shehbaz and Windham in FNA (vol. 7, 2010).

Conservation Status

Rank Method Rank calculation - Biotics v2

Review Date2022-02-03

Change Date2022-02-03

Edition Date2022-02-03

Edition AuthorsMacBryde, Bruce, rev. Treher (2022)

Threat ImpactMedium

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

Number of Occurrences6 - 20

Rank Reasons

Boechera cascadensis is a long-lived perennial herb of subalpine cliffs and slopes in the United States in Oregon and Washington and Canada in British Columbia. Most occurrences have only been surveyed once, so additional surveys are needed to draw conclusions about trends and to document population size and threats.

Range Extent Comments

Boechera cascadensis is known from the United States in Oregon and Washington and Canada in British Columbia (J. Penny, pers. comm., 2019, FNA 2010). It occurs in the Cascade Range and the Blue Mountains.

Occurrences Comments

There is a collection from Baker County, Oregon dated 1936 (FNA 2010).

Threat Impact Comments

Threats to this species are largely unknown but not believed to be of high impact. It occurs on cliff and rocky slopes which are largely isolated from many threats. However, it may be impacted by climate change, an increase in wildfire, competition with invasive weeds, and the potential impact of declining pollinators (J. Penny, pers. comm., 2020, W. Fertig, pers. comm., 2020).

Ecology & Habitat

Other Nations (2)

CanadaN3

Province	Rank	Native
British Columbia	S3	Yes

United StatesN1

Province	Rank	Native
Washington	S1	Yes
Oregon	SH	Yes

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (1)

Washington (1)

Area	Forest	Acres
Spangler	Umatilla National Forest	5,936

References (8)

Fertig, Walter. Personal communication. State botanist. Washington Natural Heritage Program, Olympia, WA.
Flora of North America Editorial Committee (FNA). 2010. Flora of North America north of Mexico. Vol. 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford University Press, New York. xxii + 797 pp.
Hitchcock, C.L., A. Cronquist, M. Ownbey, and J.W. Thompson. 1964. Vascular plants of the Pacific Northwest. Part 2: Salicaceae to Saxifragaceae, by C.L. Hitchcock and A. Cronquist. Univ. Washington Press, Seattle. 597 pp.
Hitchcock, C.L., and A. Cronquist. 1974. Flora of the Pacific Northwest: An illustrated manual. 2nd printing, with corrections. Univ. Washington Press, Seattle. xix + 730 pp.
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.
Penny, Jenifer. Personal communication. Program Botanist, British Columbia Conservation Data Centre, Ecosystems Branch, Ministry of Environment, Victoria, British Columbia, Canada.
Rollins, R.C. 1993a. The Cruciferae of continental North America: Systematics of the mustard family from the Arctic to Panama. Stanford Univ. Press, Stanford, California. 976 pp.
Windham, M.D., and I. A.Al-Shehbaz. 2007a. New and noteworthy species of <i>Boechera</i> (Brassicaceae) II: Apomictic hybrids. Harvard Papers in Botany 11(2): 257-274.