Flower profile

Prairie rosinweed

Silphium integrifolium

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

2of our state lists

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
In Iowa, most iNaturalist sightings of it in flower come in July–September. ^iNaturalist
iNaturalist has 300 research-grade sightings of it in Kansas, ranking #93 among the 109 flowers on our Kansas list. ^iNaturalist
iNaturalist has 289 research-grade sightings of it in Iowa, ranking #90 among the 109 flowers on our Iowa list. ^iNaturalist

Prairie rosinweed gift ideas

Handmade prairie rosinweed gifts from independent makers.

🌱 Sample spot. Handmade gift picks from independent shops will appear here once our shop partnership is approved. These cards are placeholders, not real products.

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Prairie rosinweed art print
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When does it bloom?

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

Bloom time in each of our 2 states

State	Type	Peak bloom	Sightings*
Kansas	Native	few records	300
Iowa	Native	July–September	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.

More Kansas flowers

Common yarrow

Achillea millefolium

Native

🌼 Few flowering records in KS

White snakeroot

Ageratina altissima

Native

🌼 Blooms in KS: August–October

Sunflowers

Helianthus

★ KS state flower

🌼 Blooms in KS: July–October

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.