Silphium mohrii, known by the common names Mohr's rosinweed and shaggy rosinweed, is a species of flowering plant in the family Asteraceae. It is native to the Southeastern United States, where it is native only to northern Alabama, southern Tennessee, and extreme northwest Georgia. It occurs in prairie remnants and rocky limestone openings, often in open, dry habitats with thin soils. Because of its restricted range and severely declined habitat, it is considered a vulnerable species.

It produces heads of yellow flowers in late summer, typically flowering from August to September.

The species was first described by John Kunkel Small in 1897.

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