Grindelia spp. (#Asteraceae) are known as gumweeds, but they produce resin, not gum. The milky resin is visible pooling in the young inflorescence heads in this photo of Grindelia squarrosa by Linda in Fortuna CCBYNC2. Function: Defense? Antitranspirant? #resin #Botany 🌾🧪🌱
