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Mahonia nervosa
''Mahonia nervosa'', commonly known as dwarf Oregon-grape, Cascade barberry, Cascade Oregon-grape, or dull Oregon-grape, is a flowering plant native to the northwest coast of North America from southern British Columbia south to central California, with an isolated population inland in northern Idaho.〔Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California 1–1400. University of California Press, Berkeley.〕〔Munz, P. A. & D. D. Keck. 1959. California Flora 1–1681. University of California Press, Berkeley. 〕〔Hitchcock, C. H., A.J. Cronquist, F. M. Ownbey & J. W. Thompson. 1984. Salicaceae to Saxifragaceae. Part II: 1–597. In C. L. Hitchcock et al. Vascular Plants of the Pacific Northwest. University of Washington Press, Seattle.〕 It is especially common in second growth, Douglas-fir or western redcedar forests, making use of those pools of sunlight that intermittently reach the ground.
Some authors place the entire genus ''Mahonia'' within the genus ''Berberis''.〔Loconte, H., & J. R. Estes. 1989. Phylogenetic systematics of Berberidaceae and Ranunculales (Magnoliidae). Systematic Botany 14:565-579.〕〔Marroquín, Jorge S., & Joseph E. Laferrière. 1997. Transfer of specific and infraspecific taxa from Mahonia to Berberis. Journal of the Arizona-Nevada Academy of Science 30(1):53-55.〕〔Laferrière, Joseph E. 1997. Transfer of specific and infraspecific taxa from Mahonia to Berberis. Bot. Zhurn. 82(9):96-99.〕
The plant was collected by Lewis and Clark during their famous expedition to the West before being described for science in 1813.〔''Fl. Amer. Sept.'' (Pursh) 219. 1814 (1813 ). Collectors: M.Lewis, W.Clark s.n. (【引用サイトリンク】title=Plant Name Details for ''Berberis nervosa'' )〕
==Description==
It is an evergreen shrub with short vertical stems, mostly under , while the leaves reach higher, rarely up to tall. The leaves are compound, with 9-19 leaflets; each leaflet is strongly toothed, reminiscent of holly, and somewhat shiny, but less so than tall Oregon-grape. The leaflets do not have a single central vein as in that species, but several veins arranged fan-like, branched from the leaflet base, hence the epithet ''nervosa''. The flowers and fruit are like those of other Oregon-grapes, and are equally bitter-tasting.
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