Bloomipedia
Woollypod milkvetch (Astragalus purshii)
Photo: Deniz Wilson via iNaturalist · CC0 · resized

Flower profile

Woollypod milkvetch

Astragalus purshii

Native in the lower 48

Woollypod milkvetch 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 March–June.

11states
2of our state lists
4,519U.S. sightings*

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

On our lists for: Idaho, Nevada

Quick look

Astragalus purshii is a species of milkvetch known by the common names woollypod milkvetch and Pursh's milkvetch.

  • It belongs to the Fabaceae 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 11 states. USDA PLANTS
  • NatureServe lists it as native to Idaho and Nevada. NatureServe
  • In Idaho, most iNaturalist sightings of it in flower come in March–June. iNaturalist
  • In Nevada, most iNaturalist sightings of it in flower come in February–May. iNaturalist
  • USDA PLANTS lists its flower color as white. USDA PLANTS
  • USDA PLANTS gives its bloom period as mid spring. USDA PLANTS
  • USDA PLANTS lists a mature height of about 0.6 ft. USDA PLANTS
  • iNaturalist has 771 research-grade sightings of it in Idaho, ranking #33 among the 109 flowers on our Idaho list. iNaturalist
  • iNaturalist has 570 research-grade sightings of it in Nevada, ranking #68 among the 110 flowers on our Nevada list. iNaturalist

Woollypod milkvetch gift ideas

Handmade woollypod milkvetch gifts from independent makers.

When does it bloom?

Flowering records by month across the U.S. (iNaturalist research-grade observations marked “Flowering”) (462 records)
Bloom time in each of our 2 states
StateTypePeak bloomSightings*
IdahoNativeMarch–June771
NevadaNativeFebruary–May570

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
Idaho
No list Idaho has no state law listing endangered or threatened plants, so we show NatureServe's Idaho ranks instead. NatureServe: S5, secure in Idaho.
Nevada
Not listed Not on Nevada fully protected plants, critically endangered (NAC 527.010). NatureServe: S4, apparently secure in Nevada. NAC 527.010
Rare elsewhere
No other U.S. state ranks it S1, S2, SH or SX.

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

Can you eat it?

For peopleToxic (slight, per USDA)

USDA PLANTS rates its toxicity as “slight.” (USDA's rating covers people and livestock and doesn't say which parts.) NC State Extension has no page for it. USDA PLANTS

For petsToxic to horses

ASPCA's entry “Loco Weed (Astragalus spp.)” (Astragalus spp), which covers the whole genus, lists it as toxic to horses. Signs include: Incoordination, depression, inability to eat and drink, fetal death and birth defects Credit: Image Courtesy of Gary Coffman, PBase.com Gallery… ASPCA

🌿 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 woollypod milkvetch in 11 states.

recorded by USDA PLANTS on our state lists not recorded

See the full list of states

California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington, Wyoming.

Idaho counties with USDA records: Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, Boise, Butte, Canyon, Caribou, Cassia, Clark, Custer, Elmore, Franklin, Fremont, Gem, Gooding, Idaho, Kootenai, Lemhi, Lincoln, Nez Perce, Owyhee, Payette, Power, Twin Falls, Washington.

Nevada counties with USDA records: Carson City, Churchill, Clark, Douglas, Elko, Esmeralda, Eureka, Humboldt, Lander, Lincoln, Lyon, Mineral, Nye, Pershing, Storey, Washoe, White Pine.

More Idaho flowers

Sources