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Tanacetum vulgare
Yellow flower with very compact flower heads.
Abundant along the Missouri River near Wolf Creek, Montana
4 Comments
Very beautiful
Tansy is considered invasive here in Minnesota as well, but I've not seen a lot of it yet. It is certainly, however, around here. Glad to be of help.
Gordon,
I agree. Looks like it's invasive to Montana. In some places it's really got a strong foothold. Thanks for the ID.
I'm not very familiar with this plant, but it looks like tansy (Tanacetum vulgare). See http://en.wikipedia.org/wiki/Tansy for more information. Let us know if you agree.