Dicotyledon | Literature for Ambrosia artemisiifolia
Wagner et al., 1990, 1999. |
Asteraceae -- The Sunflower Family | Bibliography |
Ambrosia artemisiifolia | |
Common name(s): ragweed, common ragweed |
General Information | ||
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Distribution | Native to the United States and southern Canada.In the Hawaiian Islands, naturalized on O`ahu, Moloka`i, Maui, Hawai`i. |
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Habit |
Erect, taprooted annual herbs; stems 3-10 dm long, branched at least above, ± hirsute. |
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Leaves |
Leaves pinnatifid or bipinnatifid, the lobes lanceolate, blades narrowly to broadly ovate or elliptic, 4-10(-30) cm long, 4-7(-15) cm wide, upper surface hirsutulous, lower surface strigose and often hirsute on the veins. |
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Flowers |
Male involucre 1.5-2 mm high; female involucre 3-5 mm high in fruit with a single series of short, sharp, erect spines near or above the middle. |
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Chromosomes |
2n = 34, 36 |
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