Common Ragweed, Ambrosia artemisiifolia
Asteraceae or Sunflower Family
Erect herb, up to 6 feet tall, but usually about 3
feet. Leaves deeply dissected into many tiny segments.
Flowers tiny, in crowded spikes at the top of the plant, green.
Blooms in late summer
Common native plant of fields, roadsides,
gardens and croplands. Much despised because its pollen, along
with that of giant ragweed, is the principal cause of autumn
Giant ragweed (Ambrosia trifida)
has similar flowers (that also cause hayfever), but it is much
taller and its leaves are divideded into three lobes.