Arctic Bluegrass (Poa arctica)
Arctic Bluegrass (Poa arctica), Grass Family (Poaceae), native and common in alpine and subalpine meadows and on scree slopes, also in the higher montane. on the eastern and western slopes. Blooms from June through August. Photo by Mo...
Purple Loosestrife (Lythrum salicaria)
Purple Loosestrife (Lythrum salicaria), Loosestrife Family (Lythraceae), Introduced species on the Colorado A List of noxious weeds. Uncommon in moist places such as along the margins of ponds, in irrigation ditches, and wetlands, an aggressive weed which should be...
Japanese Knotweed (Polygonum cuspidatum)
Japanese Knotweed (Polygonum cuspidatum), Buckwheat Family (Polygonaceae). An introduced species, cultivated in Colorado and sometimes escaping. This is on the A List of noxious plants (not well established but should be eradicated where found). Only documented in...