Adjective modifier

• common: Last year, glyphosate-resistant common ragweed was confirmed in Missouri, which was also resistant to 10 times the normal rate of application.

• short: In Hawaii, short ragweed ( Ambrosia artemisiifolia L. ) is reported to be present in a number of locations.

Modifies a noun

• dermatitis: This would appear to be the manner in which Australian bush dermatitis, ragweed dermatitis, and parthenium dermatitis are all produced.

• pollen: I just found out a few days ago, that I'm very allergic to ragweed pollen.