As we get an early start on the growing season, you may be interested in reviewing your weed identification or training others to identify invasive plants. There are a series of weed identification videos on the UW-Extension YouTube page developed by the Renz Lab that can help you accomplish either of those tasks.
For an example, feast your eyes on this little beauty.
You can find videos for a number of other species at the UW-Extension YouTube channel.
You can also find links to these videos and other invasive plant management informatoin at the UW-Extension weed science page.