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Photographer: Kenneth J. Sytsma
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Family Asteraceae
Ambrosia psilostachya DC.
perennial ragweed, western ragweed
Ambrosia: Greek for "food of the gods"
psilostachya: derived from the Greek psilos, "bare," and stachys, "a spike," hence a "bare spike"
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| Status: | Native |
| Plant: | erect, perennial, 12"-40" tall forb with upper branches; creeping, fibrous roots |
| Flower: | inflorescence of many, small, green, bead-like heads on 6" spikes; blooms Aug.-Sept. |
| Fruit: | seeds not on fluffy pappus |
| Leaf: | usually once pinnately-divided, lower leaves opposite, upper leaves alternate |
| Habitat: | dry; prairies, disturbed sites; in sandy soil |
| (Glossary) |
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