WHERE’S WILDLIFE • WILDFLOWER FIELD GUIDE

Flat-leaved Bladderwort

Utricularia intermedia

Pronounced (approximate): yoo-trik-yoo-LAIR-ee-ah in-ter-MEE-dee-ah

Small yellow flowers stand above shallow water. The lower lip is broad and the upper lip bears reddish veins.

Flat-leaved Bladderwort (Utricularia intermedia): flower details. Tap the photo to open the gallery.

NATIVE • NORTH AMERICA

At a glance

Family Lentibulariaceae
Life cycle Perennial
Blooms July–August
Height 4 to 10 inches
Habitat part shade, sun; bogs, swamps, along shores, shallows

Common names: Flat-leaved Bladderwort

Bloom timing varies with latitude, weather and local conditions.

Sightings map

Explore reported observations. Sightings are not a complete range map.

How to recognize it

Key identification clues

  • Small yellow flowers stand above shallow water.
  • The lower lip is broad and the upper lip bears reddish veins.
  • Finely divided green shoots differ from the pale bladder-bearing shoots.

Where and when to look

part shade, sun; bogs, swamps, along shores, shallows. Flowering season: July–August.

Compare similar plants

Common Bladderwort has larger flowers and bladders on leafy shoots. Flat-leaved Bladderwort bears most bladders on specialized pale shoots.

A closer look

Flower details

Small yellow flowers stand above shallow water.

Leaves & stems

The lower lip is broad and the upper lip bears reddish veins.

Whole plant & habitat

Finely divided green shoots differ from the pale bladder-bearing shoots. Pair close views with a photograph of the whole plant.

Field photographs

1 field photographs. Select a photograph to enlarge it; use Load more photos to see the rest.

Range & sightings

Native in North America.

Reported U.S. distribution
AK, CA, CO, CT, IA, ID, IL, IN, MA, MD, ME, MI, MN, MT, ND, NH, NJ, NV, NY, OH, OR, PA, RI, UT, VT, WA, WI, WY

Includes native and introduced state records where listed; a state record does not imply occurrence in every county.

Observation maps show submitted records, not every place the plant occurs. Follow local access rules when visiting a site.

Keep learning

Practice recognizing Flat-leaved Bladderwort in the flower quiz, or compare it with other plants in the guide.

Sources & further reading

Field photographs: Where’s Wildlife.

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