San Diego County, California, US
Taft Point trail in a shady wooded area. (Achillea millefolium)
Near a lake, along the Denali Highway in Alaska. Other shots of Achillea millefolium I've seen have yellow centers but I'm not sure if that's because they're really more yellow or maybe they're just in a different stage of development than this and look different because their yellow anthers stick out more. Maybe this is the subspecies Achillea millefolium L. var. borealis (aka Achillea borealis, Northern Yarrow)?
Pink variety of Yarrow
Very very deep woods! No trails or anything to guide my way.
This plant must be a native, since it is within a pristine area of native oak woodland, accompanied by a panoply of reliably native understory plants: Toyon, Arctostaphylos, Bush monkey flower, Birdsfoot fern, etc.
Achillea millefolium, known commonly as yarrow /ˈjæroʊ/ or common yarrow, is a flowering plant in the family Asteraceae. It is native to temperate regions of the Northern Hemisphere in Asia, Europe, and North America. In New Mexico and southern Colorado, it is called plumajillo (Spanish for 'little feather') from its leaf shape and texture. In antiquity, yarrow was known as herbal militaris, for its use in stanching the flow of blood from wounds. Other common names...