Taxon Report

Utricularia intermedia Hayne

flat-leaved bladderwort

Print Report

Barry Rice 2004

Taxon Summary

Utricularia intermedia, commonly known as flat-leaved bladderwort, is a perennial stoloniferous herb (carnivorous) (aquatic) in the Lentibulariaceae that is found in California and elsewhere. It occurs within Bogs and fens, Marshes and swamps (lake margins), Meadows and seeps (mesic), and Vernal pools, growing at elevations from 1200 to 2700 meters. Utricularia intermedia is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Utricularia intermedia Hayne
Common Name:	flat-leaved bladderwort
Family:	Lentibulariaceae
Element Code:	PDLNT020A0
USDA Plants Symbol:	UTIN2
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial stoloniferous herb (carnivorous) (aquatic)
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	1200-2700 (3935-8860)
General Habitats:	Bogs and fens, Marshes and swamps, Meadows and seeps, Vernal pools
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.2
Global Rank:	G5
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	IUCN_LC
CRPR Changes:	changed from 2.2 to 2B.2 on 2013-06-12

Occurrence Data from the CNDDB


Total Occurrences:	29
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	3
Fair (C)	1
Poor (D)	1
None (X)	1
Unknown (U)	23

Location


California Endemic: False
California Counties and Islands: Name (Code)
Butte (BUT), El Dorado (ELD), Fresno (FRE), Mariposa (MPA), Modoc (MOD), Placer (PLA), Plumas (PLU), Tehama (TEH), Tulare (TUL)
Quads: Name (Quad Code)
Almanor (4012122), Ambrose (4112058), Blairsden (3912075), Butte Meadows (4012115), Chester (4012132), Childs Meadows (4012134), Egg Lake (4112133), Florence Lake (3711838), Half Dome (3711965), Homewood (3912012), Huntington Lake (3711922), Johnsville (3912076), Jonesville (4012114), Kaiser Peak (3711932), Meadow Valley (3912181), Mt. Harkness (4012143), Muir Grove (3611867), Nelson Mtn. (3711911), Reading Peak (4012144), Red Cinder (4012142), Storrie (3912183)

Threat List Data from the CNDDB


Threat List Total:	4
EOs with Threat Listed:	Total EOs	% of EOs
	3	10 %
Foot traffic/trampling	2	6%
Grazing	1	3%
Other	1	3%
Altered flood/tidal/hydrologic regime	1	3%

Notes



Possibly threatened by grazing and trampling. State-listed as Sensitive in WA. See Madroño 22(2):74-84 (1973) for taxonomic treatment.
Threats:

Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 30 January 2025].