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Order Asterales, Family Asteraceae, Genus Grindelia
This plant can grow to three feet with multiple stems and become a real nuisance. It has basal leaves with serrate, clasping leaves and is a perennial. To understand why it is called "Gumweed," just touch a bud.
This photo shows the attachment of the leaf to the stem. There is no leaf stem, hence the leaf is sessile.