Boechera horizontalis (Greene) Windham & Al-Shehbaz (2007:266)

Creeping woody rock cress, Horizontal woody rockcress



Taxonomy & Nomenclature

Synonyms: Arabis horizontalis Greene in Leafl. Bot. Observ. Crit. 2: 74 (1910); Arabis suffrutescens var. horizontalis (Greene) Rollins in Res. Stud. State Coll. Wash. 4: 50 (1936)


Conservation Status

Last record: 1950 (Oregon); 1951 (California) (both Kagan & Vrilakas, 1993:13)

Rediscovered in 1984 (Kagan & Vrilakas, 1993:13)



Oregon, USA


Biology & Ecology










Flora of North America Editorial Committee. (2010). Flora of North America North of Mexico. Vol. 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford University Press, New York. xxii + 797 pp.

Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 529. MIM, Deurne.

Govaerts, R. (2003). World Checklist of Seed Plants Database in ACCESS G: 1-40325.

Hickman, J. C. (ed.). (1993). The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.

Kagan, Jimmy and Vrilakas, Susan. (1993). Extinct and Extirpated Plants from Oregon. Kalmiopsis [1993]: 12-16.

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.

Meinke, R. J. (1982). Threatened and Endangered Vascular Plants of Oregon: An Illustrated Guide. U.S. Fish and Wildlife Service, Region 1, Portland, Oregon. 326 pp.

Rollins, R. C. (1993). The Cruciferae of continental North America: Systematics of the mustard family from the Arctic to Panama. Stanford Univ. Press, Stanford, California. 976 pp.

Siddall, J. L., Chambers, K. I. and Wagner, D. H. (1979). Rare, threatened and endangered vascular plants in Oregon — an interim report. Oregon Natural Area Preserves Advisory Committee, Division of State Lands. 109 pp.

Walter, Kerry S. and Gillett, Harriet J. (eds.). (1998). 1997 IUCN Red List of Threatened Plants. Compiled by the World Conservation Monitoring Centre. Gland, Switzerland & Cambridge, UK: IUCN – The World Conservation Union. lxiv + 862 pp.

Windham, M. D., and Al-Shehbaz, I. A. (2007). New and noteworthy species of Boechera (Brassicaceae) II: Apomictic hybrids. Harvard Papers in Botany 11: 257-274.


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