Flower profile

Prairie rosinweed

Silphium integrifolium

Prairie rosinweed (Silphium integrifolium) is a flowering plant in the Asteraceae family, native in the lower 48 states, blooming mostly July–September across the U.S.

Native in the lower 48

Prairie rosinweed is a wildflower that USDA PLANTS lists as native in the lower 48 states. It's on our flower lists for 2 states, and across the U.S. it's most often seen in bloom in July–September.

21states where USDA records it

2Bloomipedia state lists include it

7,350U.S. sightings*

*iNaturalist research-grade observations, as of October 17, 2026.

On our lists for: Iowa, Kansas

Quick look

Silphium integrifolium is a species of flowering plant in the family Asteraceae. Its common names include rosinweed, whole-leaf rosinweed, entire-leaf rosinweed, prairie rosinweed, and silflower. It is native to eastern North America, including Ontario in Canada and the eastern and central United States as far west as New Mexico.
From Wikipedia's article Silphium integrifolium, CC BY-SA 4.0.

It belongs to the Asteraceae family. ^iNaturalist
USDA PLANTS describes it as an herb (forb) with a perennial life cycle. ^{USDA PLANTS}
USDA PLANTS lists it as native in the lower 48 states and records it in 21 states. ^{USDA PLANTS}
NatureServe lists it as native to Kansas and Iowa. ^NatureServe
iNaturalist has 300 research-grade sightings of it in Kansas, ranking #93 among the 151 flowers on our Kansas list. ^iNaturalist
iNaturalist has 289 research-grade sightings of it in Iowa, ranking #90 among the 147 flowers on our Iowa list. ^iNaturalist

When does it bloom?

Flowering records by month across the U.S. (iNaturalist research-grade observations marked “Flowering”) (502 records)

Bloom time in the 2 states whose Bloomipedia list includes it

State	Type	Peak bloom	Sightings*
Kansas	Native	few records (14)	300
Iowa	Native	few records (27)	289

Conservation status

Federal (U.S. ESA): Not listed No U.S. Endangered Species Act listing in the USFWS ECOS database. ^{USFWS ECOS}
NatureServe global: G5 Secure worldwide. ^NatureServe
Kansas: No list Kansas's endangered and threatened list (K.A.R. 115-15-1) covers animals only, so we show NatureServe's Kansas ranks for plants. NatureServe: SNR, not yet ranked in Kansas.
Iowa: Not listed Not on Iowa endangered, threatened and special concern plants (Iowa Admin. Code r. 571-77.3). NatureServe: S4, apparently secure in Iowa. ^{IAC 571-77.3}
Rare elsewhere: Other states where NatureServe ranks it rare or missing: CO (SH), MI (S2), SD (S1), WY (S1). (S1 critically imperiled, S2 imperiled, SH possibly extirpated, SX presumed extirpated.)

Checked October 17, 2026. Rankings and lists can change, so follow the links for the latest.

Can you eat it?

For peopleNot well documented

None of the sources we checked (NC State Extension (no edibility or poison notes on its page), USDA PLANTS) say whether it's edible or poisonous for people. ^{NC State Extension}

For petsNot well documented

It isn't on the ASPCA plant list, and NC State Extension doesn't flag it for pets.

🌿 Never eat a wild plant unless you're certain of its ID; this isn't medical advice. Worried about a person? Call Poison Control at 1-800-222-1222. Worried about a pet? Call your vet.

Where does it grow?

USDA PLANTS records prairie rosinweed in 21 states.

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recorded by USDA PLANTS on our state lists not recorded

See the full list of states

Alabama, Arkansas, Colorado, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Mexico, Oklahoma, South Dakota, Tennessee, Texas, Wisconsin, Wyoming.

Kansas counties with USDA records: Anderson, Barber, Barton, Brown, Butler, Chase, Chautauqua, Cherokee, Clay, Cloud, Cowley, Dickinson, Doniphan, Douglas, Elk, Ellis, Ellsworth, Franklin, Geary, Greenwood, Harvey, Jackson, Jefferson, Jewell, Kiowa, Labette, Leavenworth, Lincoln, Lyon, Marion, Marshall, McPherson, Miami, Mitchell, Montgomery, Morris, Nemaha, Neosho, Osage, Osborne, Ottawa, Pottawatomie, Reno, Republic, Riley, Rooks, Saline, Sedgwick, Shawnee, Smith, Sumner, Wabaunsee, Washington, Wilson, Woodson.

Iowa counties with USDA records: Audubon, Cass, Davis, Fremont, Guthrie, Mahaska, Mills, Page, Ringgold, Taylor, Union, Washington.

Names, range and relatives

Native status by region (USDA PLANTS): Canada: Introduced; Lower 48 states: Native.

County records: USDA PLANTS lists it in 484 counties across 18 states; the most are in Missouri (107), Illinois (92), Kansas (55).

Other Silphium on Bloomipedia (3): Cup plant, Compass plant, Prairie dock.

More from the Asteraceae family (212 on Bloomipedia; most observed first): Common yarrow, Goldenrods, White snakeroot, Sunflowers, Chicory, Black-eyed Susan, Bull thistle, Common dandelion.

More Kansas flowers

Sunflowers

Helianthus

★ KS state flower

🌼 Blooms in KS: July–September

Compass plant

Silphium laciniatum

Native

🌼 Few flowering records in KS

Common yarrow

Achillea millefolium

Native

🌼 Few flowering records in KS

Sources

USDA, NRCS. PLANTS Database, profile SIIN2.
iNaturalist, Silphium integrifolium: taxonomy, research-grade observation counts and “Flowering” annotations, retrieved October 17, 2026.
Wikipedia, Silphium integrifolium (lead quoted under CC BY-SA 4.0).
Kansas: Kansas noxious weeds (K.A.R. 4-8-44, as amended 2026).
Iowa: Iowa endangered, threatened and special concern plants (Iowa Admin. Code r. 571-77.3).
Iowa: Iowa noxious weeds (Iowa Code § 317.1A).
USFWS, ECOS species database (ESA listing check), October 17, 2026.
NatureServe Explorer, Silphium integrifolium (global and state ranks).
Edibility and toxicity: NC State Extension.
Photo: Eric Schmidt via iNaturalist · CC BY 4.0 · resized.