Erysimum arenicola explained

Erysimum arenicola, the Cascade wallflower, is a plant species native to British Columbia, Washington and Oregon. It is found at high elevations from 900 to 2200 m in the Cascade and Olympic Mountains as well as on Vancouver Island.^[1]

Erysimum arenicola is a perennial herb up to 30 cm tall. Leaves are narrow, up to 8 cm long. Flowers are yellow, borne in a raceme. Fruits are narrow and elongated, up to 10 cm long, straight or twisted, strongly torulose (= much narrower in between seeds) giving a lumpy appearance along the length of the mature fruit (silique).^{[1] [2] [3] [4]}

Notes and References

1. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250095074 Flora of North America v 7 p 536.
2. https://www.biodiversitylibrary.org/page/8866062#page/144/mode/1up Watson, Sereno. 1891. Proceedings of the American Academy of Arts and Sciences 26: 124
3. http://www.tropicos.org/ImageFullView.aspx?imageid=26316 photo of isotype of Erysimum arenicola at Missouri Botanical Garden
4. Hitchcock, C. H., A.J. Cronquist, F. M. Ownbey & J. W. Thompson. 1984. Salicaceae to Saxifragaceae. Part II: 1–597. In C. L. Hitchcock Vascular Plants of the Pacific Northwest. University of Washington Press, Seattle.