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Photographer: Merel R. Black
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Family Asteraceae
Eupatorium rugosum Houtt. var. rugosum
white snakeroot
Eupatorium: from Greek name Mithridates Eupator, King of Pontus about 115BC who is said to have discovered an antidote to a commonly used poison in one of the species
rugosum: rough
Hazardous 
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| Status: | Native - potentially invasive |
| Plant: | erect, perennial, 1'-5' tall forb with 1 to 3 mostly hairless, leafy stems |
| Flower: | head with 12-25 white disk flowers; inflorescence 3" flat to roundish, branched clusters of many heads; blooms July-Oct. |
| Fruit: | dry seed on fluffy pappus |
| Leaf: | opposite, blade 1 1/2 to 5 times longer than the long stalk, bases rounded, edges coarsely toothed  |
| Habitat: | moderate moisture; woods, disturbed sites; in rocky soil |
| (Glossary) |
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