Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.
Search native plant database:
Utricularia macrorhiza Leconte
Synonym(s): Utricularia vulgaris, Utricularia vulgaris ssp. macrorhiza, Utricularia vulgaris var. americana
USDA Symbol: UTMA
A small floating plant with 6-20 bilaterally symmetrical, yellow flowers in each rather stout, erect raceme.
This species also occurs in Eurasia. Of possibly five Utricularia species in the West, several difficult to distinguish, this has the largest flowers. Another species easy to identify is Mountain Bladderwort (U. intermedia), with bladders on special branches distinct from the leaves. In all species of Utricularia the bladders are elaborate traps. When a small organism brushes hairs near a bladder pore, the pores tiny door opens inward and water rushes inside, carrying the organism with it. The door quickly closes, the trapping process taking 1/460 second. Enzymes digest the victim. Comparatively large organisms, such as mosquito larvae, may be caught in the door; if the door is repeatedly triggered, they are then digested little by little.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Bloom InformationBloom Color: Pink , Yellow , Purple
Bloom Time: Jun , Jul , Aug
, WY Canada: AB
, YT Native Distribution:
Throughout much of North America. Native Habitat:
Ponds and slow-moving water.
Growing ConditionsLight Requirement: Sun
Soil Moisture: Wet
BenefitWarning: This plants tiny stinging hairs contain an acid that can cause a severe, burning skin irritation.
Conspicuous Flowers: yes
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2007-01-01
Research By: TWC Staff