Species: Utricularia cornuta Michx.

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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