aka Epilobium angustifolium, Willow-herb, Rosebay Willowherb. Often the first to emerge in burned or logged over areas. A beautiful but invasive plant spreads by winged seeds and extensive runners. The rose to purple flowers have four petals and are fairly large, 1″ or more (2 – 3 cm) across. The plant can grow to 6′. Very common in dry open places particularly clearings and disturbed areas below 5,500′ elevation. Possibility that Alpine Fireweed, Chamaenerion latifolium, is included in the images (along Burroughs Loop and Mt. Fremont trails at about 7,000′ elevation).