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| habit--Ambrosia psilostachya is an herbaceous perennial | leaf--this kind of simple leaf is called pinnatifid, because it resembles a pinnately compound leaf |
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| male heads in Fall--these produce massive amounts of windborne pollen (like all ragweeds), and are therefore responsible for many allergies! | male heads again--notice how they are pendulous (meaning they hang down) |
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| male heads closeup--here you can see the individual flowers | female heads (center)--these occur underneath the male heads on the inflorescence stalks |
