Spotted Knapweed “Centaurea biebersteinii” Sunflower Family (Asteraceae). Biennial or perennial, plant 2-4′ tall, basal leaves segmented and upper leaves entire, flowers pink to purple or occasionally white. Blooms in summer along roadways and widespread in Or & Wa. This is an invasive weed but the Yellow-faced Bumble Bees enjoy them anyway.
Photo: Near Rainier, Or. 8/26/2008. © 2008 mkellar