Hello again, and thanks for your response. You are absolutely right on both counts. We do have a plant we call Queen Anne's Lace here in Canada, which definitely looks like the plant in your photo. Other than being an invasive roadside weed, I don't think there are any specific problem issues with it. The other plant that you referred to as Giant Cow Parsley and Giant hogweed we also call Cow parsnip in Canada. That is the one that has caused the problems for us recently, resulting in a full attack by government sprayers before it spreads further. Here is a link to the Wikipedia item, with the Latin name you mentioned. You are right, using the Latin name is less confusing than the variety of names we normally use, and which might vary country to country. Thanks again.
https://en.wikipedia.org/wiki/Heracleum_mantegazzianum

Cow parsley is very safe. You can eat everything on it from the flowers to the roots (looks like a strange carrot). It just looks like poison hemlock, which indeed is very dangerous to eat. It will take about 15 minutes to kill you, if you eat poison hemlock.