TY - JOUR AU - Chambers, Kenton L. PY - 2018/07/20 Y2 - 2024/03/29 TI - Some comments on the taxonomy of Delphinium (Ranunculaceae) in western Oregon JF - Journal of the Botanical Research Institute of Texas JA - J. Bot. Res. Inst. Texas VL - 12 IS - 1 SE - SYSTEMATICS DO - 10.17348/jbrit.v12.i1.905 UR - https://journals.brit.org/jbrit/article/view/905 SP - 17-23 AB - <p>In preparing the treatment of <em>Delphinium</em> for a future volume of <em>Flora of Oregon</em>, some taxonomic decisions were made that conflict with the 1997 treatment of the genus by Warnock in <em>Flora of North America</em>. The choice of groups to be recognized is based on the present author’s opinion that rapid evolution of <em>Delphinium</em> taxa occurred in the Willamette Valley following habitat disturbance caused by catastrophic flooding from the late-glacial-age Spokane Floods. <em>Delphinium</em> <em>pavonaceum</em> Ewan, <em>D. leucophaeum</em> Greene, and <em>D. oreganum</em> Howell, which are endemic to the Willamette Valley, may have evolved in the ca. 12,000 years since the floods occurred. These 3 groups are here given species rank, unlike their treatment in <em>Flora of North America</em>. This is in line with how the taxa are viewed by Oregon botanists concerned with the rare and endangered species of the state. Lectotypification is necessary for <em>D. pavonaceum</em>. A further taxonomic change is the reduction of <em>D. basalticum</em> M.J. Warnock to synonymy under <em>D. glareosum</em> Greene.</p> ER -