This plant, known as Neolepia campestre, or Lapidium campestre, is an
introduced mustard. I have just busted my butt for about two hours
destroying as much as I could in a depressingly small area. I feared it
might be a perennial, as Weber doesn't indicate anything about its
status at all, and Weeds of the West Doesn't even list it! So, to the
internet.
Thankfully, it is not a perennial, but an annual or biennial. I'll tell
you, however, that some of them had roots straight to Hades. I would
advise you to do as much as you can as soon as possible on this one,
because if it's allowed to stay around, it will only grow huge and
ferocious with horns and gnashing teeth!
Of course, we have a lot of invasive mustards, and we need to work on
all of them, but this one is a dilly. You will need a weeding tool.
As with all weeds, bag all flowers and seed heads. Mail them to your
worst enemy.
Best,
J
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