Compass Plant
A compass plant can spend decades building a taproot before raising its rough flower stalk above nearly every neighboring prairie plant.
Artwork inspired by John Steuart Curry
Its deeply divided basal leaves often hold their broad faces east and west, reducing punishing midday sun without functioning as a perfect compass. Resinous sap once invited the name rosinweed, and the tall yellow flower heads attract many native insects.
Never test the “compass” by twisting foliage or cutting a stalk; use several leaves and the sun’s position as a field observation, not a party trick. Scan intact prairie for the distinctive vertical leaves before searching overhead for flowers. Blooming June–September.
- Best clue
- Towering sunflower relative with deeply cut upright basal leaves
- Habitat
- deep-soil tallgrass prairie and sunny prairie remnants
- Regional status
- Native tallgrass-prairie perennial
Quick guide
- First read
- Deeply divided leaves
- Second evidence
- Yellow composite heads
Four checks for Compass Plant
- First, ignore color
- Look for use towering sunflower relative with deeply cut upright basal leaves for the first hypothesis.
- Test the first impression
- Check do not count a glimpse of east-west leaf tendency twice; find very tall flower stalk as genuinely new evidence together with yellow composite heads before accepting the identification.
- Add timing and substrate
- Deep-soil tallgrass prairie and sunny prairie remnants; blooming June–September.
- Know when to back away
- Photograph Compass Plant from durable ground, including stem, leaves, reproductive parts, and neighboring vegetation.
Good to know
Leaves often orient their broad faces east and west to reduce midday heat, but they are not precise compass needles and vary with site conditions.
Notice these
- Deeply divided leaves
- East-west leaf tendency
- Very tall flower stalk
- Yellow composite heads