Utricularia cornuta Michx.
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TAXONOMY
 
Family: Lentibulariaceae
Genus: Utricularia
 
Species Synonyms: Stomisia cornuta (Michx.) Raf.
Common Names: horned bladderwort
 
DISTRIBUTION
 
Canada: northeastern Alberta – northern Saskatchewan, southern Manitoba – Ontario – Quebec – Nova Scotia – Labrador
Saskatchewan: northern Saskatchewan; Lake Athabasca – Reindeer Lake
Ecoregion: Athabasca Plain, Churchill River Upland
 
HABITAT
 
Saskatchewan: marshy lake shores and bogs
 
RARITY STATUS
 
Provincial Status According
to Harms (2003):
Threatened
Nature Conservancy Status:
G5 S2
Saskatchewan Species at
Risk Status:
None
COSEWIC Status:
None
 
Horned bladderwort is threatened because it is rare or uncommon in Saskatchewan. Its occurrence is regionally restricted and population sizes vary. No threats are known or anticipated at this time.
 
SPECIES DESCRIPTION
 
Height: 10 – 25 cm
Stems: underground stems terrestrial, delicate, thread-like; above ground stems leafless, wiry
Leaves: alternate, underwater, simple or slightly forking, segments linear; bladders minute
Inflorescence: 1 – 3-flowered; flowers subsessile, subtended by a free bract and 2 smaller bractlets
Flowers: perfect, irregular; sepals 2-parted, upper segment somewhat broader; longer sepal tapered to a long point; petals 2-lipped, upper lip erect, lower lip prominently arched, spur awl-shaped, yellow; stamens 2, inserted near the base of the tube; stigma unevenly 2-lobed
Fruits: capsule hidden by sepals, many seeded
 
UTRICULARIA KEY FOR SPECIES FOUND IN SASKATCHEWAN
 
1 Leaves simple or slightly forking
U. cornuta
1 Leaves copiously dissected
2
   
2 Ultimate leaf-segments round, progressively smaller in successive branchings; lower lip of the petals about equal to the upper lip
U. macrorhiza
2 Ultimate leaf-segments flat, nearly as wide as primary branches; lower lip of the petals about 2 times as long as the upper
3
   
3 Bladder traps borne on the leaves; terminal leaf segments with entire margins
U. minor
3 Bladder traps borne on separate elongate branches; terminal leaf segments with minutely, finely saw-toothed margins
U. intermedia