Giant ragweed. Asteraceae. Common throughout the park. Photo shows flowers with pollen.
In ancient Greek mythology, ambrosia (Greek: ἀμβροσία) is sometimes the food or drink of the Greek gods (or demigods), often depicted as conferring ageless immortality upon whoever consumed it. It was brought to the gods in Olympus by doves, so it may have been thought of in the Homeric tradition as a kind of divine exhalation of the Earth.