The day from my childhood with my chi-nookmis (great grandmother) is vivid in my memory. We’re walking the edge of a B.C. forest near the Columbia River, surrounded by lush early summer greenery. Far from her home territory of Nippissing and Sagamok, Elizabeth sees a plant she knows is here, too. Her hand points out yarrow, its umbrella of densely packed, small white flowers atop strong stems and feathery leaves.