Bloomipedia
Ballhead waterleaf (Hydrophyllum capitatum)
Photo: mefisher via iNaturalist · CC0 · resized

Flower profile

Ballhead waterleaf

Hydrophyllum capitatum

Native in the lower 48

Ballhead waterleaf 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 April–July.

9states
2of our state lists
4,755U.S. sightings*

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

On our lists for: Idaho, Wyoming

Quick look

Hydrophyllum capitatum, is a species of waterleaf known by the common name ballhead waterleaf. It is native to Western North America from British Columbia to Utah.

  • It belongs to the Boraginaceae 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 9 states. USDA PLANTS
  • NatureServe lists it as native to Idaho and Wyoming. NatureServe
  • In Idaho, most iNaturalist sightings of it in flower come in April–June. iNaturalist
  • In Wyoming, most iNaturalist sightings of it in flower come in May–July. iNaturalist
  • USDA PLANTS lists its flower color as purple. USDA PLANTS
  • USDA PLANTS gives its bloom period as early spring. USDA PLANTS
  • USDA PLANTS lists a mature height of about 1 ft. USDA PLANTS
  • iNaturalist has 819 research-grade sightings of it in Idaho, ranking #30 among the 109 flowers on our Idaho list. iNaturalist
  • iNaturalist has 363 research-grade sightings of it in Wyoming, ranking #78 among the 107 flowers on our Wyoming list. iNaturalist

Ballhead waterleaf gift ideas

Handmade ballhead waterleaf gifts from independent makers.

When does it bloom?

Flowering records by month across the U.S. (iNaturalist research-grade observations marked “Flowering”) (716 records)
Bloom time in each of our 2 states
StateTypePeak bloomSightings*
IdahoNativeApril–June819
WyomingNativeMay–July363

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: SNR, not yet ranked in Idaho.
Wyoming
No list Wyoming has no state law listing endangered or threatened plants, so we show NatureServe's Wyoming ranks instead. NatureServe: S4, apparently secure in Wyoming.
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 peopleNot well documented

None of the sources we checked (NC State Extension (no page for this plant), USDA PLANTS) 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 records ballhead waterleaf in 9 states.

recorded by USDA PLANTS on our state lists not recorded

See the full list of states

California, Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington, Wyoming.

Idaho counties with USDA records: Ada, Adams, Bannock, Benewah, Blaine, Boise, Bonner, Bonneville, Butte, Caribou, Cassia, Clark, Clearwater, Custer, Elmore, Franklin, Fremont, Gem, Gooding, Idaho, Kootenai, Latah, Lemhi, Lincoln, Nez Perce, Oneida, Owyhee, Power, Twin Falls, Valley, Washington.

Wyoming counties with USDA records: Carbon, Fremont, Lincoln, Natrona, Park, Sublette, Teton, Uinta.

More Idaho flowers

Sources