Anne Elliott's photos with the keyword: noxious weed

A macro of a small Canada Thistle flower, Cirsium arvense, (also known locally as Creeping Thistle). This species was introduced from France. Also called Field Thistle. The stems of this noxious weed (with beautiful flowers) creep underground, forming colonies and it seems to have invaded everywhere, preventing our native species from growing. Photographed this one at Horseshoe Canyon, near Drumheller, in the Alberta Badlands. talkaboutwildlife.ca/profile/?s=1281

This is the most attractive and almost metalic-looking seedhead of a huge Nodding Thistle (also known as Musk Thistle).

This plant, seen in the Nose Hill Natural Area, was introduced from Europe. The genus name Cynoglossum comes from the Greek words "kuon" and "glossa", meaning "dog's tongue". Leaves (7 to 30 cm long) produced in first year resemble the shape of a dog's tongue. It is easily spread by seed attachment to clothing and animals. It contains toxic alkaloids that can cause liver damage in grazing animals.

The attractive flower of the noxious weed.