Flower profile

Stinknet

Oncosiphon pilulifer

Stinknet (Oncosiphon pilulifer) is a flowering plant in the Asteraceae family, blooming mostly March–May across the U.S.

Stinknet is a flowering plant. In Arizona it's most often seen in bloom in March–May.

–states where USDA records it

8,784AZ sightings*

12,475U.S. sightings*

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

On our lists for: Arizona

Quick look

Oncosiphon pilulifer, also known as globe chamomile and stinknet, is a flowering plant in the daisy family (Asteraceae) native to South Africa and Lesotho. It is considered invasive in some parts of North America.
From Wikipedia's article Oncosiphon pilulifer, CC BY-SA 4.0.

It belongs to the Asteraceae family. ^iNaturalist
In Arizona, most iNaturalist sightings of it in flower come in March–May. ^iNaturalist
iNaturalist has 8,784 research-grade sightings of it in Arizona, ranking #8 among the 132 flowers on our Arizona list. ^iNaturalist

When does it bloom?

In Arizona, most flowering sightings come in March–May.

Flowering records by month in Arizona (iNaturalist research-grade observations marked “Flowering”) (623 records)

Conservation status

Federal (U.S. ESA): Not listed No U.S. Endangered Species Act listing in the USFWS ECOS database. ^{USFWS ECOS}
NatureServe: Unknown We couldn't find this name in NatureServe Explorer. ^NatureServe
Arizona: Not listed Not on Arizona Native Plant Law protected plants (Ariz. Admin. Code R3-3 Art. 11, App. A, eff. Feb. 2, 2025). ^{AAC R3-3 App. A}

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 page for this plant)) say whether it's edible or poisonous for people.

For petsNot well documented

It isn't on the ASPCA plant list.

🌿 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 has no state-by-state distribution for this name, so we can't map it yet.

Names, range and relatives

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 Arizona flowers

Brittlebush

Encelia farinosa

Native

🌼 Blooms in AZ: January–December

Desert marigold

Baileya multiradiata

Native

🌼 Blooms in AZ: March–May

American threefold

Trixis californica

Native

🌼 Blooms in AZ: February–May

Sources

USDA PLANTS: no profile matched this name.
iNaturalist, Oncosiphon pilulifer: taxonomy, research-grade observation counts and “Flowering” annotations, retrieved October 17, 2026.
Wikipedia, Oncosiphon pilulifer (lead quoted under CC BY-SA 4.0).
Arizona: Arizona Native Plant Law protected plants (Ariz. Admin. Code R3-3 Art. 11, App. A, eff. Feb. 2, 2025).
Arizona: Arizona prohibited noxious weeds (Ariz. Admin. Code R3-4-245).
USFWS, ECOS species database (ESA listing check), October 17, 2026.
Edibility and toxicity: no source found (marked "not well documented").
Photo: Rachel Stringham via iNaturalist · CC BY 4.0 · resized.