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Photographer: Merel R. Black
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Family Asteraceae
Silphium integrifolium Michx.
prairie rosinweed, whole-leaf rosinweed
Silphium: old Greek generic name referring to resinous juice
integrifolium: Latin for "entire-leaved"
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| Status: | Native |
| Plant: | erect, perennial, 2'-6' tall forb; stems leafy, cylindrical in X-section |
| Flower: | head 2"-3" wide with 16-33 (usually 21 or 34) yellow rays 3/4"-1" long; disk usually 1/2"-1" wide; inflorescence of many heads in large, branched clusters; blooms July-Sept. |
| Fruit: | dry seed with no fluffy pappus |
| Leaf: | mostly opposite but not surrounding the stem, lower and upper leaves about the same size |
| Habitat: | full sun; dry, moderate moisture to wet; prairies, meadows; in sandy, loamy soil |
| (Glossary) |
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