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Genus Utricularia Family Lentibulariaceae

Description: Small annual or perennial herbs, stoloniferous; stems modified to appear and function as roots, 'leaves' and traps for capture of organisms; tubers sometimes present. 'Leaves' basal, alternate, opposite or in whorls, sometimes apparently absent. Traps variously placed, hollow, globose or ovoid, stalked or sessile.

Inflorescence racemose; bracteate, bracts basifixed or with an extension below the point of attachment (basisolute). Calyx 2- or rarely 4-lobed, usually free to the base but sometimes ± united. Corolla 2-lipped; upper lip usually smallest, with ± well-defined basal sac, apex entire, or ± 2-lobed (rarely more); lower lip often large, spurred.

Fruit a globose or ovoid capsule, usually dehiscing by longitudinal slits; seeds 1–many, usually small, variously shaped and winged, sometimes viviparous.

Distribution and occurrence: World: 214 species, cosmopolitan. Australia: 57 species (40 species endemic), all States.

Treatment based on Taylor (1989). Definition of term: Basisolute (sometimes termed medifixed, spurred, peltate) = where a scale, bract or bracteole organ is attached at some point above its base.

Text by R. Rowe & E. A. Brown
Taxon concept:

 Key to the species 
1Bracteoles absent; flowers yellow (if not cleistogamous) or white to slightly reddish (cleistogamous) or blue2
Bracteoles present; flowers white or shades of pink to violet, usually with a yellow palate7
2Inflorescence with a whorl of ellipsoid floats above middleUtricularia stellaris
Inflorescence lacking floats
                       Back to 1
3Stolons anchored in substrate4
Stolons freely suspended in water column
                       Back to 2
4Leaf lamina filiform, bi- or tri-pinnately divided; flowers blueUtricularia biloba
Leaf lamina linear with subacute apex; corolla yellow (chasmogamous) or corolla reduced and white or reddish (cleistogamous)
                       Back to 3
Utricularia subulata
5Leaves with ultimate segments few (2–8); upper corolla lip larger than lowerUtricularia gibba
Leaves with ultimate segments numerous (20–80); upper corolla lip smaller than lower
                       Back to 3
6Corolla externally glabrous; peduncle with 1 or more scales; leaves with 2 primary segmentsUtricularia australis
Corolla externally pubescent; peduncle lacking scales; leaves with 3 or more primary segments
                       Back to 5
Utricularia aurea
7Peduncle with scales present8
Peduncle lacking scales
                       Back to 1
8Corolla with upper lip deeply and distinctly 2-lobed (like rabbit ears)Utricularia sandersonii
Corolla with upper lip unlobed or shallowly 2-lobed
                       Back to 7
9Bracts basiolute (medifixed)Utricularia caerulea
Bracts (inserted at base of flower pedicel) basifixed
                       Back to 8
10Bracts c. 4 times broader than bracteoles, c. 2 mm long, with apex acuteUtricularia uliginosa
Bracts mostly only slightly broader than bracteoles (up to twice width), c. 1 mm long, with apex subacute
                       Back to 9
Utricularia lateriflora
11Lower corolla lip with central yellow pair of ridges not projecting apically beyond ridges on either sideUtricularia uniflora
Lower corolla lip with central yellow pair of ridges projecting apically beyond ridges on either side
                       Back to 7
12Inflorescence 1–4 cm high, usually 1-flowered; corolla 6–10 mm longUtricularia monanthos
Inflorescence 10–50 cm high, 2–many-flowered; corolla 12–22 mm long
                       Back to 11
13Lower corolla lip with 2 or 3 conspicuous yellow central ridgesUtricularia dichotoma
Lower corolla lip with 4–11 conspicuous yellow central ridges
                       Back to 12
Utricularia beaugleholei

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