Brief note about this plant along Towson Run above the Bellona Bridge. I am pretty sure this is giant ragweed, Ambrosia trifida, for the usual three lobed leaf. It can be variable up to five lobes. Will try to add the flower. Can be up to 12 feet tall. Just as allergenic as common ragweed. See the nasty looking pollen online, sharp spines under the microscope. Leaf margins are serrated. This plant was only two feet, will watch for its big brother. Below tried to highlight the characteristic hairs on the stem and frequent branches. The leaves did have a rough sand paper feel, a grain, can be stroked distal but not as easy proximal.
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