Utricularia intermedia - Hayne
Flatleaf Bladderwort
Other Common Names: flatleaf bladderwort
Taxonomic Status: Accepted
Related ITIS Name(s): Utricularia intermedia Hayne (TSN 34454)
Unique Identifier: ELEMENT_GLOBAL.2.152008
Element Code: PDLNT020A0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Bladderwort Family
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Scrophulariales Lentibulariaceae Utricularia
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Concept Reference
Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Utricularia intermedia
Conservation Status

NatureServe Status

Global Status: G5
Global Status Last Reviewed: 13May2016
Global Status Last Changed: 16Apr1984
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G5 - Secure
Nation: United States
National Status: NNR
Nation: Canada
National Status: N5 (16Apr2014)

U.S. & Canada State/Province Status
United States Alaska (SNR), California (S3), Colorado (S1), Connecticut (SNR), Idaho (S3), Illinois (S1), Indiana (S3), Iowa (SH), Maine (SNR), Maryland (S1), Massachusetts (SNR), Michigan (SNR), Minnesota (SNR), Montana (S2), Nevada (SNR), New Hampshire (SNR), New Jersey (S3), New York (S4), North Dakota (S2), Ohio (S2), Oregon (S4), Pennsylvania (S2), Rhode Island (S1), Utah (S1), Vermont (SNR), Washington (S2), Wisconsin (SNR), Wyoming (S1)
Canada Alberta (S4), British Columbia (S4), Labrador (S4S5), Manitoba (S5), New Brunswick (S5), Newfoundland Island (S5), Northwest Territories (SNR), Nova Scotia (S5), Nunavut (SU), Ontario (S5), Quebec (S4S5), Saskatchewan (S5), Yukon Territory (S4)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Circumboreal; in North America occurs from Alaska to eastern Canada and south to California, northwestern Wyoming, North Dakota, Illinois, and Pennsylvania.

Other NatureServe Conservation Status Information

Global Range: Circumboreal; in North America occurs from Alaska to eastern Canada and south to California, northwestern Wyoming, North Dakota, Illinois, and Pennsylvania.

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States 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
Canada AB, BC, LB, MB, NB, NF, NS, NT, NU, ON, QC, SK, YT

Range Map
No map available.

U.S. Distribution by County Help
State County Name (FIPS Code)
CA Butte (06007), Fresno (06019)*, Modoc (06049)*, Plumas (06063), Tulare (06107)
CO Dolores (08033)
IA Clay (19041)*, Emmet (19063)*, Kossuth (19109)*
IL Cook (17031), Kane (17089)*, Lake (17097), Mchenry (17111)
IN Lake (18089)
MD Kent (24029)
MT Flathead (30029), Lincoln (30053)
ND Bottineau (38009), Cavalier (38019)*, McHenry (38049), Pembina (38067)*
NJ Bergen (34003)*, Burlington (34005)*, Camden (34007)*, Essex (34013)*, Hudson (34017)*, Morris (34027), Ocean (34029), Sussex (34037), Warren (34041)*
OH Champaign (39021), Clark (39023), Logan (39091), Miami (39109), Portage (39133), Stark (39151), Summit (39153), Williams (39171)
PA Bucks (42017)*, Carbon (42025)*, Crawford (42039), Erie (42049), Luzerne (42079), Northampton (42095)*, Pike (42103), Sullivan (42113), Susquehanna (42115), Wayne (42127), Wyoming (42131)*
RI Kent (44003)*, Providence (44007)
WA Clallam (53009), King (53033), Klickitat (53039)*, Pend Oreille (53051), Skamania (53059), Snohomish (53061)
WY Teton (56039)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
01 Narragansett (01090004)+, Pawcatuck-Wood (01090005)+*
02 Rondout (02020007)+*, Lower Hudson (02030101)+*, Hackensack-Passaic (02030103)+, Sandy Hook-Staten Island (02030104)+*, Upper Delaware (02040101)+, Lackawaxen (02040103)+, Middle Delaware-Mongaup-Brodhead (02040104)+, Middle Delaware-Musconetcong (02040105)+, Lehigh (02040106)+*, Crosswicks-Neshaminy (02040201)+*, Lower Delaware (02040202)+*, Schuylkill (02040203)+*, Mullica-Toms (02040301)+, Upper Susquehanna (02050101)+, Upper Susquehanna-Tunkhannock (02050106)+, Upper Susquehanna-Lackawanna (02050107)+, Chester-Sassafras (02060002)+
04 Pike-Root (04040002)+, St. Joseph (04100003)+, Cuyahoga (04110002)+, Lake Erie (04120200)+
05 French (05010004)+*, Shenango (05030102)+, Tuscarawas (05040001)+, Upper Great Miami (05080001)+
07 Blue Earth (07020009)+*, Upper Des Moines (07100002)+*, East Fork Des Moines (07100003)+*, Chicago (07120003)+, Des Plaines (07120004)+, Upper Fox (07120006)+, Lower Fox (07120007)+*
09 Lower Souris (09010003)+, Willow (09010004)+, Lower Red (09020311)+*, Lower Pembina River (09020316)+*
10 Little Sioux (10230003)+*
14 Upper Dolores (14030002)+
17 Upper Kootenai (17010101)+, Middle Fork Flathead (17010207)+, Flathead Lake (17010208)+, Stillwater (17010210)+, Little Spokane (17010308)+, Greys-Hobock (17040103)+, Middle Columbia-Hood (17070105)+, Klickitat (17070106)+*, Hoh-Quillayute (17100101)+, Snoqualmie (17110010)+, Lake Washington (17110012)+
18 Upper Pit (18020002)+*, North Fork Feather (18020121)+, Middle Fork Feather (18020123)+*, Upper Kaweah (18030007)+*, Upper King (18030010)+, Upper San Joaquin (18040006)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
General Description: Flat-leaved Bladderwort is a perennial aquatic herb with submerged stems, leaves, bladders, overwintering buds, and emergent flowers. The plants have slender stems with numerous, crowded, finely dissected leaves. The leaves are mostly 0.5-2 cm long, flattened, and have several linear divisions all of about the same width and abruptly tapering or blunt at the tip. Bladders, which trap small aquatic animals for the plant's nourishment, are borne on separate specialized branches. Two to four small snapdragon-like flowers are borne on short pedicels on a 4-15 mm long, erect, leafless scape which holds them out of the water. Flowers have an inconspicuous, two-lobed calyx and a bright yellow, two-lipped corolla. The lower corolla lip is usually 4-8 mm long; underneath, it has a spur which is half or more as long as the entire lip; above, it has a prominent raised palate. The upper corolla lip is about half as long as the lower lip. The mature fruits are few seeded, dry, globular capsules borne on erect pedicels.
Technical Description: From CNHP Wetland Guide 2012: Growth Habit: insectivorous, aquatic herb with both floating and immersed stems and leaves.
Turions (winter buds): 7-16 mm long, ovoid, densely bristly.
Leaves: numerous, 5-10 mm long, usually palmately 3-parted at the base, 3 divisions unequally 1-3 times dichotomously branched, ultimate segments narrowly linear, flat; bladders 2.5-4 mm long, borne on specialized leafless branches.
Flowers: 1-4 in a lax raceme, scape 8-25 cm long, pedicles remaining erect in fruit; calyx lips 3-4.5 mm long, upper slightly longer than the lower; corolla 10-15 mm long, yellow, with a prominent palate, spur 5-8.5 mm long.

Diagnostic Characteristics: Distinguished from Utricularia vulgaris by having leaves which are initially 3-parted at the base with flattened segments. Distinguished from U. minor by having bladders borne on separate specialized branches rather than among the leaves, by having flowers with the lower lip with a long spur and a prominent palate, and by mature fruits on erect rather than curved pedicels.

From CNHP Wetland Guide 2012: Main Characteristics:
·Spur about as long as the lower corolla lip; corolla deep yellow
·Tips of leaf segments usually slightly rounded; bristles of leaf margins not on teeth

Economic Attributes Not yet assessed
Management Summary Not yet assessed
Population/Occurrence Delineation Not yet assessed
Population/Occurrence Viability
U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
Element Ecology & Life History Edition Date: 13Dec1994
Element Ecology & Life History Author(s): JM

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

  • Andersen, M.D. and B. Heidel. 2011. HUC-based species range maps. Prepared by Wyoming Natural Diversity Database for use in the pilot WISDOM application operational from inception to yet-to-be-determined date of update of tool.

  • Ceska, A. and M. A. M. Bell. 1973. Utricularia (Lentibulariaceae) in the Pacific Northwest. Madroņo 22:74-84.

  • Cronquist, A., A. H. Holmgren, N. H. Holmgren, J. L. Reveal, and P. K. Holmgren. 1984. Intermountain Flora; Vascular Plants of the Intermountain West, U.S.A. Volume 4: Subclass Asteridae. New York Botanical Garden, Bronx, NY.

  • Dorn, R. D. 2001. Vascular Plants of Wyoming, third edition. Mountain West Publishing, Cheyenne, WY.

  • Evert, E. F. 2010. Vascular Plants of the Greater Yellowstone Area: Annotated Catalog and Atlas. Park Ridge, IL.

  • Fertig, W. 1997. Additions to the flora of Wyoming. Castilleja 16:5.

  • Fertig, W. 1998. Plant species of special concern and vascular plant flora of the National Elk Refuge. Unpublished report prepared for the U.S. Fish and Wildlife Service by the Wyoming Natural Diversity Database, Laramie, WY.

  • Heidel, B. 2013. Status of Antennaria arcuata (Meadow pussytoes) in Sublette County, Wyoming. Prepared for the USDI Bureau of Land Management - Pinedale and Rock Springs Field Offices by the Wyoming Natural Diversity Database - University of Wyoming, Laramie, Wyoming.

  • Hitchcock, C. L., A. Cronquist, and M. Ownbey. 1959. Vascular Plants of the Pacific Northwest, Part 4: Ericaceae through Campanulaceae. University of Washington Press, Seattle, WA.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Meades, S.J. & Hay, S.G; Brouillet, L. 2000. Annotated Checklist of Vascular Plants of Newfoundland and Labrador. Memorial University Botanical Gardens, St John's NF. 237pp.

  • Rossbach, G.B. 1939. Aquatic UTRICULARIAs. Rhodora 41 (484):113-128.

  • Steury, B., R. W. Tyndall, and G. Cooley. 1996. Noteworthy Collections, Maryland. Castanea 61(4):392-396.

  • Taylor, P. 1989. The genus Utricularia - a taxonomic monograph. Kew Bulletin Addtl. Series XIV. Royal Botanic Gardens, Kew:724.

  • Washington Natural Heritage Program. 2000. Field Guide to Washington's Rare Plants. Washington Dept. of Natural Resources and Spokane District, USDI Bureau of Land Management.

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